Add gitHubCheckMilestoneHasNoOpenIssues

Closes gh-9693

RELEASE.adoc

@@ -49,8 +49,8 @@ $ git checkout -
 
 The following command will update the dependencies again but this time creating a ticket for each update and placing `Closes gh-<number>` in the commit. Replacing the following values:
 
-<github-personal-access-token> - Replace with a https://github.com/settings/tokens[GitHub personal access token] that has a scope of `public_repo`
-<next-version> - Replace with the title of the milestone you are releasing now (i.e. 5.5.0-RC1)
+* <github-personal-access-token> - Replace with a https://github.com/settings/tokens[GitHub personal access token] that has a scope of `public_repo`
+* <next-version> - Replace with the title of the milestone you are releasing now (i.e. 5.5.0-RC1)
 
 [source,bash]
 ----
@@ -61,7 +61,18 @@ Apply any fixes from your previous branch that were necessary.
 
 = Check All Issues are Closed
 
-Check that all issues are closed for the milestone https://github.com/spring-projects/spring-security/milestones
+The following command will check if there are any open issues for the ticket.
+Before running the command, replace the following values:
+
+* <github-personal-access-token> - Replace with a https://github.com/settings/tokens[GitHub personal access token] that has a scope of `public_repo`. This is optional since you are unlikely to reach the rate limit for such a simple check.
+* <next-version> - Replace with the title of the milestone you are releasing now (i.e. 5.5.0-RC1)
+
+[source,bash]
+----
+$ ./gradlew gitHubCheckMilestoneHasNoOpenIssues -PgitHubAccessToken=<github-personal-access-token> -PnextVersion=<next-version>
+----
+
+Alternatively, you can manually check using https://github.com/spring-projects/spring-security/milestones
 
 = Update Release Version
 

build.gradle

@@ -17,6 +17,7 @@ apply plugin: 'io.spring.convention.root'
 apply plugin: 'org.jetbrains.kotlin.jvm'
 apply plugin: 'org.springframework.security.update-dependencies'
 apply plugin: 'org.springframework.security.sagan'
+apply plugin: 'org.springframework.github.milestone'
 
 group = 'org.springframework.security'
 description = 'Spring Security'
@@ -34,6 +35,13 @@ tasks.named("saganCreateRelease") {
 	apiDocUrl = "https://docs.spring.io/spring-security/site/docs/{version}/api/"
 }
 
+tasks.named("gitHubCheckMilestoneHasNoOpenIssues") {
+	repository {
+		owner = "spring-projects"
+		name = "spring-security"
+	}
+}
+
 updateDependenciesSettings {
 	gitHub {
 		organization = "spring-projects"

buildSrc/build.gradle

@@ -48,6 +48,10 @@ gradlePlugin {
 			id = "org.springframework.security.sagan"
 			implementationClass = "org.springframework.gradle.sagan.SaganPlugin"
 		}
+		githubMilestone {
+			id = "org.springframework.github.milestone"
+			implementationClass = "org.springframework.gradle.github.milestones.GitHubMilestonePlugin"
+		}
 	}
 }
 

buildSrc/src/main/java/org/springframework/gradle/github/milestones/GitHubMilestoneApi.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2019-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.gradle.github.milestones;
+
+import com.google.common.reflect.TypeToken;
+import com.google.gson.Gson;
+import okhttp3.Interceptor;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import java.io.IOException;
+import java.util.List;
+
+public class GitHubMilestoneApi {
+	private String baseUrl = "https://api.github.com";
+
+	private OkHttpClient client;
+
+	private Gson gson = new Gson();
+
+	public GitHubMilestoneApi() {
+		this.client = new OkHttpClient.Builder().build();
+	}
+
+	public GitHubMilestoneApi(String gitHubToken) {
+		this.client = new OkHttpClient.Builder()
+				.addInterceptor(new AuthorizationInterceptor(gitHubToken))
+				.build();
+	}
+
+	public void setBaseUrl(String baseUrl) {
+		this.baseUrl = baseUrl;
+	}
+
+	public long findMilestoneNumberByTitle(RepositoryRef repositoryRef, String milestoneTitle) {
+		String url = this.baseUrl + "/repos/" + repositoryRef.getOwner() + "/" + repositoryRef.getName() + "/milestones?per_page=100";
+		Request request = new Request.Builder().get().url(url)
+				.build();
+		try {
+			Response response = this.client.newCall(request).execute();
+			if (!response.isSuccessful()) {
+				throw new RuntimeException("Could not find milestone with title " + milestoneTitle + " for repository " + repositoryRef + ". Response " + response);
+			}
+			List<Milestone> milestones = this.gson.fromJson(response.body().charStream(), new TypeToken<List<Milestone>>(){}.getType());
+			for (Milestone milestone : milestones) {
+				if (milestoneTitle.equals(milestone.getTitle())) {
+					return milestone.getNumber();
+				}
+			}
+			if (milestones.size() <= 100) {
+				throw new RuntimeException("Could not find open milestone with title " + milestoneTitle + " for repository " + repositoryRef + " Got " + milestones);
+			}
+			throw new RuntimeException("It is possible there are too many open milestones open (only 100 are supported). Could not find open milestone with title " + milestoneTitle + " for repository " + repositoryRef + " Got " + milestones);
+		} catch (IOException e) {
+			throw new RuntimeException("Could not find open milestone with title " + milestoneTitle + " for repository " + repositoryRef, e);
+		}
+	}
+
+	public boolean isOpenIssuesForMilestoneNumber(RepositoryRef repositoryRef, long milestoneNumber) {
+		String url = this.baseUrl + "/repos/" + repositoryRef.getOwner() + "/" + repositoryRef.getName() + "/issues?per_page=1&milestone=" + milestoneNumber;
+		Request request = new Request.Builder().get().url(url)
+				.build();
+		try {
+			Response response = this.client.newCall(request).execute();
+			if (!response.isSuccessful()) {
+				throw new RuntimeException("Could not find issues for milestone number " + milestoneNumber + " for repository " + repositoryRef + ". Response " + response);
+			}
+			List<Object> issues = this.gson.fromJson(response.body().charStream(), new TypeToken<List<Object>>(){}.getType());
+			return !issues.isEmpty();
+		} catch (IOException e) {
+			throw new RuntimeException("Could not find issues for milestone number " + milestoneNumber + " for repository " + repositoryRef, e);
+		}
+	}
+
+//	public boolean isOpenIssuesForMilestoneName(String owner, String repository, String milestoneName) {
+//
+//	}
+
+
+	private static class AuthorizationInterceptor implements Interceptor {
+
+		private final String token;
+
+		public AuthorizationInterceptor(String token) {
+			this.token = token;
+		}
+
+		@Override
+		public okhttp3.Response intercept(Chain chain) throws IOException {
+			Request request = chain.request().newBuilder()
+					.addHeader("Authorization", "Bearer " + this.token).build();
+			return chain.proceed(request);
+		}
+	}
+}

buildSrc/src/main/java/org/springframework/gradle/github/milestones/GitHubMilestoneHasNoOpenIssuesTask.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2019-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.gradle.github.milestones;
+
+import org.gradle.api.Action;
+import org.gradle.api.DefaultTask;
+import org.gradle.api.tasks.Input;
+import org.gradle.api.tasks.Optional;
+import org.gradle.api.tasks.TaskAction;
+
+public class GitHubMilestoneHasNoOpenIssuesTask extends DefaultTask {
+	@Input
+	private RepositoryRef repository = new RepositoryRef();
+
+	@Input
+	private String milestoneTitle;
+
+	@Input @Optional
+	private String gitHubAccessToken;
+
+	private GitHubMilestoneApi milestones = new GitHubMilestoneApi();
+
+	@TaskAction
+	public void checkHasNoOpenIssues() {
+		long milestoneNumber = this.milestones.findMilestoneNumberByTitle(this.repository, this.milestoneTitle);
+		boolean isOpenIssues = this.milestones.isOpenIssuesForMilestoneNumber(this.repository, milestoneNumber);
+		if (isOpenIssues) {
+			throw new IllegalStateException("The repository " + this.repository + " has open issues for milestone with the title " + this.milestoneTitle + " and number " + milestoneNumber);
+		}
+		System.out.println("The repository " + this.repository + " has no open issues for milestone with the title " + this.milestoneTitle + " and number " + milestoneNumber);
+	}
+
+	public RepositoryRef getRepository() {
+		return repository;
+	}
+
+	public void repository(Action<RepositoryRef> repository) {
+		repository.execute(this.repository);
+	}
+
+	public void setRepository(RepositoryRef repository) {
+		this.repository = repository;
+	}
+
+	public String getMilestoneTitle() {
+		return milestoneTitle;
+	}
+
+	public void setMilestoneTitle(String milestoneTitle) {
+		this.milestoneTitle = milestoneTitle;
+	}
+
+	public String getGitHubAccessToken() {
+		return gitHubAccessToken;
+	}
+
+	public void setGitHubAccessToken(String gitHubAccessToken) {
+		this.gitHubAccessToken = gitHubAccessToken;
+		this.milestones = new GitHubMilestoneApi(gitHubAccessToken);
+	}
+}

buildSrc/src/main/java/org/springframework/gradle/github/milestones/GitHubMilestonePlugin.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.gradle.github.milestones;
+
+import org.gradle.api.Action;
+import org.gradle.api.Plugin;
+import org.gradle.api.Project;
+
+public class GitHubMilestonePlugin implements Plugin<Project> {
+	@Override
+	public void apply(Project project) {
+		project.getTasks().register("gitHubCheckMilestoneHasNoOpenIssues", GitHubMilestoneHasNoOpenIssuesTask.class, new Action<GitHubMilestoneHasNoOpenIssuesTask>() {
+			@Override
+			public void execute(GitHubMilestoneHasNoOpenIssuesTask githubCheckMilestoneHasNoOpenIssues) {
+				githubCheckMilestoneHasNoOpenIssues.setGroup("Release");
+				githubCheckMilestoneHasNoOpenIssues.setDescription("Checks if there are any open issues for the specified repository and milestone");
+				githubCheckMilestoneHasNoOpenIssues.setMilestoneTitle((String) project.findProperty("nextVersion"));
+				if (project.hasProperty("githubAccessToken")) {
+					githubCheckMilestoneHasNoOpenIssues.setGitHubAccessToken((String) project.findProperty("gitHubAccessToken"));
+				}
+			}
+		});
+	}
+}

buildSrc/src/main/java/org/springframework/gradle/github/milestones/Milestone.java

@@ -0,0 +1,31 @@
+package org.springframework.gradle.github.milestones;
+
+public class Milestone {
+	private String title;
+
+	private long number;
+
+	public String getTitle() {
+		return title;
+	}
+
+	public void setTitle(String title) {
+		this.title = title;
+	}
+
+	public long getNumber() {
+		return number;
+	}
+
+	public void setNumber(long number) {
+		this.number = number;
+	}
+
+	@Override
+	public String toString() {
+		return "Milestone{" +
+				"title='" + title + '\'' +
+				", number=" + number +
+				'}';
+	}
+}

buildSrc/src/main/java/org/springframework/gradle/github/milestones/RepositoryRef.java

@@ -0,0 +1,65 @@
+package org.springframework.gradle.github.milestones;
+public class RepositoryRef {
+	private String owner;
+
+	private String name;
+
+	RepositoryRef() {
+	}
+
+	public RepositoryRef(String owner, String name) {
+		this.owner = owner;
+		this.name = name;
+	}
+
+	public String getOwner() {
+		return owner;
+	}
+
+	public void setOwner(String owner) {
+		this.owner = owner;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	@Override
+	public String toString() {
+		return "RepositoryRef{" +
+				"owner='" + owner + '\'' +
+				", name='" + name + '\'' +
+				'}';
+	}
+
+	public static RepositoryRefBuilder owner(String owner) {
+		return new RepositoryRefBuilder().owner(owner);
+	}
+
+	public static final class RepositoryRefBuilder {
+		private String owner;
+		private String repository;
+
+		private RepositoryRefBuilder() {
+		}
+
+		private RepositoryRefBuilder owner(String owner) {
+			this.owner = owner;
+			return this;
+		}
+
+		public RepositoryRefBuilder repository(String repository) {
+			this.repository = repository;
+			return this;
+		}
+
+		public RepositoryRef build() {
+			return new RepositoryRef(owner, repository);
+		}
+	}
+}
+

buildSrc/src/test/java/io/spring/gradle/github/milestones/GitHubMilestoneApiTests.java

@@ -0,0 +1,388 @@
+package io.spring.gradle.github.milestones;
+
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.gradle.github.milestones.GitHubMilestoneApi;
+import org.springframework.gradle.github.milestones.RepositoryRef;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+
+
+public class GitHubMilestoneApiTests {
+	private GitHubMilestoneApi github;
+
+	private RepositoryRef repositoryRef = RepositoryRef.owner("spring-projects").repository("spring-security").build();
+
+	private MockWebServer server;
+
+	private String baseUrl;
+
+	@Before
+	public void setup() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		this.github = new GitHubMilestoneApi("mock-oauth-token");
+		this.baseUrl = this.server.url("/api").toString();
+		this.github.setBaseUrl(this.baseUrl);
+	}
+
+	@After
+	public void cleanup() throws Exception {
+		this.server.shutdown();
+	}
+
+	@Test
+	public void findMilestoneNumberByTitleWhenFoundThenSuccess() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/207\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207/labels\",\n" +
+				"      \"id\":6611880,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNjYxMTg4MA==\",\n" +
+				"      \"number\":207,\n" +
+				"      \"title\":\"5.6.x\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jgrandja\",\n" +
+				"         \"id\":10884212,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjEwODg0MjEy\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/10884212?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jgrandja\",\n" +
+				"         \"html_url\":\"https://github.com/jgrandja\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jgrandja/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jgrandja/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jgrandja/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jgrandja/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jgrandja/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jgrandja/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jgrandja/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jgrandja/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jgrandja/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":1,\n" +
+				"      \"closed_issues\":0,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2021-03-31T11:29:17Z\",\n" +
+				"      \"updated_at\":\"2021-03-31T11:30:47Z\",\n" +
+				"      \"due_on\":null,\n" +
+				"      \"closed_at\":null\n" +
+				"   },\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"      \"id\":5884208,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"      \"number\":191,\n" +
+				"      \"title\":\"5.5.0-RC1\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":21,\n" +
+				"      \"closed_issues\":23,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"      \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"      \"closed_at\":null\n" +
+				"   }\n" +
+				"]";
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		long milestoneNumberByTitle = this.github.findMilestoneNumberByTitle(this.repositoryRef, "5.5.0-RC1");
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/milestones?per_page=100");
+
+		assertThat(milestoneNumberByTitle).isEqualTo(191);
+	}
+
+	@Test
+	public void findMilestoneNumberByTitleWhenNotFoundThenException() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/207\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207/labels\",\n" +
+				"      \"id\":6611880,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNjYxMTg4MA==\",\n" +
+				"      \"number\":207,\n" +
+				"      \"title\":\"5.6.x\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jgrandja\",\n" +
+				"         \"id\":10884212,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjEwODg0MjEy\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/10884212?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jgrandja\",\n" +
+				"         \"html_url\":\"https://github.com/jgrandja\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jgrandja/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jgrandja/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jgrandja/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jgrandja/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jgrandja/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jgrandja/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jgrandja/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jgrandja/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jgrandja/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":1,\n" +
+				"      \"closed_issues\":0,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2021-03-31T11:29:17Z\",\n" +
+				"      \"updated_at\":\"2021-03-31T11:30:47Z\",\n" +
+				"      \"due_on\":null,\n" +
+				"      \"closed_at\":null\n" +
+				"   },\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"      \"id\":5884208,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"      \"number\":191,\n" +
+				"      \"title\":\"5.5.0-RC1\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":21,\n" +
+				"      \"closed_issues\":23,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"      \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"      \"closed_at\":null\n" +
+				"   }\n" +
+				"]";
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThatExceptionOfType(RuntimeException.class)
+				.isThrownBy(() -> this.github.findMilestoneNumberByTitle(this.repositoryRef, "missing"));
+	}
+
+	@Test
+	public void isOpenIssuesForMilestoneNumberWhenAllClosedThenFalse() throws Exception {
+		String responseJson = "[]";
+		long milestoneNumber = 202;
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThat(this.github.isOpenIssuesForMilestoneNumber(this.repositoryRef, milestoneNumber)).isFalse();
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/issues?per_page=1&milestone=" + milestoneNumber);
+	}
+
+	@Test
+	public void isOpenIssuesForMilestoneNumberWhenOpenIssuesThenTrue() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562\",\n" +
+				"      \"repository_url\":\"https://api.github.com/repos/spring-projects/spring-security\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/labels{/name}\",\n" +
+				"      \"comments_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/comments\",\n" +
+				"      \"events_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/events\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/pull/9562\",\n" +
+				"      \"id\":851886504,\n" +
+				"      \"node_id\":\"MDExOlB1bGxSZXF1ZXN0NjEwMjMzMDcw\",\n" +
+				"      \"number\":9562,\n" +
+				"      \"title\":\"Add package-list\",\n" +
+				"      \"user\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"labels\":[\n" +
+				"         {\n" +
+				"            \"id\":322225043,\n" +
+				"            \"node_id\":\"MDU6TGFiZWwzMjIyMjUwNDM=\",\n" +
+				"            \"url\":\"https://api.github.com/repos/spring-projects/spring-security/labels/in:%20build\",\n" +
+				"            \"name\":\"in: build\",\n" +
+				"            \"color\":\"e8f9de\",\n" +
+				"            \"default\":false,\n" +
+				"            \"description\":\"An issue in the build\"\n" +
+				"         },\n" +
+				"         {\n" +
+				"            \"id\":322225079,\n" +
+				"            \"node_id\":\"MDU6TGFiZWwzMjIyMjUwNzk=\",\n" +
+				"            \"url\":\"https://api.github.com/repos/spring-projects/spring-security/labels/type:%20bug\",\n" +
+				"            \"name\":\"type: bug\",\n" +
+				"            \"color\":\"e3d9fc\",\n" +
+				"            \"default\":false,\n" +
+				"            \"description\":\"A general bug\"\n" +
+				"         }\n" +
+				"      ],\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"locked\":false,\n" +
+				"      \"assignee\":{\n" +
+				"         \"login\":\"rwinch\",\n" +
+				"         \"id\":362503,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjUwMw==\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/362503?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/rwinch\",\n" +
+				"         \"html_url\":\"https://github.com/rwinch\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/rwinch/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/rwinch/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/rwinch/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/rwinch/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/rwinch/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/rwinch/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/rwinch/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/rwinch/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/rwinch/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"assignees\":[\n" +
+				"         {\n" +
+				"            \"login\":\"rwinch\",\n" +
+				"            \"id\":362503,\n" +
+				"            \"node_id\":\"MDQ6VXNlcjM2MjUwMw==\",\n" +
+				"            \"avatar_url\":\"https://avatars.githubusercontent.com/u/362503?v=4\",\n" +
+				"            \"gravatar_id\":\"\",\n" +
+				"            \"url\":\"https://api.github.com/users/rwinch\",\n" +
+				"            \"html_url\":\"https://github.com/rwinch\",\n" +
+				"            \"followers_url\":\"https://api.github.com/users/rwinch/followers\",\n" +
+				"            \"following_url\":\"https://api.github.com/users/rwinch/following{/other_user}\",\n" +
+				"            \"gists_url\":\"https://api.github.com/users/rwinch/gists{/gist_id}\",\n" +
+				"            \"starred_url\":\"https://api.github.com/users/rwinch/starred{/owner}{/repo}\",\n" +
+				"            \"subscriptions_url\":\"https://api.github.com/users/rwinch/subscriptions\",\n" +
+				"            \"organizations_url\":\"https://api.github.com/users/rwinch/orgs\",\n" +
+				"            \"repos_url\":\"https://api.github.com/users/rwinch/repos\",\n" +
+				"            \"events_url\":\"https://api.github.com/users/rwinch/events{/privacy}\",\n" +
+				"            \"received_events_url\":\"https://api.github.com/users/rwinch/received_events\",\n" +
+				"            \"type\":\"User\",\n" +
+				"            \"site_admin\":false\n" +
+				"         }\n" +
+				"      ],\n" +
+				"      \"milestone\":{\n" +
+				"         \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"         \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"         \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"         \"id\":5884208,\n" +
+				"         \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"         \"number\":191,\n" +
+				"         \"title\":\"5.5.0-RC1\",\n" +
+				"         \"description\":\"\",\n" +
+				"         \"creator\":{\n" +
+				"            \"login\":\"jzheaux\",\n" +
+				"            \"id\":3627351,\n" +
+				"            \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"            \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"            \"gravatar_id\":\"\",\n" +
+				"            \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"            \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"            \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"            \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"            \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"            \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"            \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"            \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"            \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"            \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"            \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"            \"type\":\"User\",\n" +
+				"            \"site_admin\":false\n" +
+				"         },\n" +
+				"         \"open_issues\":21,\n" +
+				"         \"closed_issues\":23,\n" +
+				"         \"state\":\"open\",\n" +
+				"         \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"         \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"         \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"         \"closed_at\":null\n" +
+				"      },\n" +
+				"      \"comments\":0,\n" +
+				"      \"created_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"updated_at\":\"2021-04-07T17:00:00Z\",\n" +
+				"      \"closed_at\":null,\n" +
+				"      \"author_association\":\"MEMBER\",\n" +
+				"      \"active_lock_reason\":null,\n" +
+				"      \"pull_request\":{\n" +
+				"         \"url\":\"https://api.github.com/repos/spring-projects/spring-security/pulls/9562\",\n" +
+				"         \"html_url\":\"https://github.com/spring-projects/spring-security/pull/9562\",\n" +
+				"         \"diff_url\":\"https://github.com/spring-projects/spring-security/pull/9562.diff\",\n" +
+				"         \"patch_url\":\"https://github.com/spring-projects/spring-security/pull/9562.patch\"\n" +
+				"      },\n" +
+				"      \"body\":\"Closes gh-9528\\r\\n\\r\\n<!--\\r\\nFor Security Vulnerabilities, please use https://pivotal.io/security#reporting\\r\\n-->\\r\\n\\r\\n<!--\\r\\nBefore creating new features, we recommend creating an issue to discuss the feature. This ensures that everyone is on the same page before extensive work is done.\\r\\n\\r\\nThanks for contributing to Spring Security. Please provide a brief description of your pull-request and reference any related issue numbers (prefix references with gh-).\\r\\n-->\\r\\n\",\n" +
+				"      \"performed_via_github_app\":null\n" +
+				"   }\n" +
+				"]";
+		long milestoneNumber = 191;
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThat(this.github.isOpenIssuesForMilestoneNumber(this.repositoryRef, milestoneNumber)).isTrue();
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/issues?per_page=1&milestone=" + milestoneNumber);
+	}
+
+}

buildSrc/src/test/java/org/springframework/gradle/github/milestones/GitHubMilestoneApiTests.java

@@ -0,0 +1,386 @@
+package org.springframework.gradle.github.milestones;
+
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+
+
+public class GitHubMilestoneApiTests {
+	private GitHubMilestoneApi github;
+
+	private RepositoryRef repositoryRef = RepositoryRef.owner("spring-projects").repository("spring-security").build();
+
+	private MockWebServer server;
+
+	private String baseUrl;
+
+	@Before
+	public void setup() throws Exception {
+		this.server = new MockWebServer();
+		this.server.start();
+		this.github = new GitHubMilestoneApi("mock-oauth-token");
+		this.baseUrl = this.server.url("/api").toString();
+		this.github.setBaseUrl(this.baseUrl);
+	}
+
+	@After
+	public void cleanup() throws Exception {
+		this.server.shutdown();
+	}
+
+	@Test
+	public void findMilestoneNumberByTitleWhenFoundThenSuccess() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/207\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207/labels\",\n" +
+				"      \"id\":6611880,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNjYxMTg4MA==\",\n" +
+				"      \"number\":207,\n" +
+				"      \"title\":\"5.6.x\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jgrandja\",\n" +
+				"         \"id\":10884212,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjEwODg0MjEy\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/10884212?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jgrandja\",\n" +
+				"         \"html_url\":\"https://github.com/jgrandja\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jgrandja/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jgrandja/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jgrandja/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jgrandja/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jgrandja/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jgrandja/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jgrandja/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jgrandja/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jgrandja/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":1,\n" +
+				"      \"closed_issues\":0,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2021-03-31T11:29:17Z\",\n" +
+				"      \"updated_at\":\"2021-03-31T11:30:47Z\",\n" +
+				"      \"due_on\":null,\n" +
+				"      \"closed_at\":null\n" +
+				"   },\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"      \"id\":5884208,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"      \"number\":191,\n" +
+				"      \"title\":\"5.5.0-RC1\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":21,\n" +
+				"      \"closed_issues\":23,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"      \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"      \"closed_at\":null\n" +
+				"   }\n" +
+				"]";
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		long milestoneNumberByTitle = this.github.findMilestoneNumberByTitle(this.repositoryRef, "5.5.0-RC1");
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/milestones?per_page=100");
+
+		assertThat(milestoneNumberByTitle).isEqualTo(191);
+	}
+
+	@Test
+	public void findMilestoneNumberByTitleWhenNotFoundThenException() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/207\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/207/labels\",\n" +
+				"      \"id\":6611880,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNjYxMTg4MA==\",\n" +
+				"      \"number\":207,\n" +
+				"      \"title\":\"5.6.x\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jgrandja\",\n" +
+				"         \"id\":10884212,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjEwODg0MjEy\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/10884212?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jgrandja\",\n" +
+				"         \"html_url\":\"https://github.com/jgrandja\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jgrandja/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jgrandja/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jgrandja/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jgrandja/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jgrandja/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jgrandja/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jgrandja/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jgrandja/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jgrandja/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":1,\n" +
+				"      \"closed_issues\":0,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2021-03-31T11:29:17Z\",\n" +
+				"      \"updated_at\":\"2021-03-31T11:30:47Z\",\n" +
+				"      \"due_on\":null,\n" +
+				"      \"closed_at\":null\n" +
+				"   },\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"      \"id\":5884208,\n" +
+				"      \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"      \"number\":191,\n" +
+				"      \"title\":\"5.5.0-RC1\",\n" +
+				"      \"description\":\"\",\n" +
+				"      \"creator\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"open_issues\":21,\n" +
+				"      \"closed_issues\":23,\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"      \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"      \"closed_at\":null\n" +
+				"   }\n" +
+				"]";
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThatExceptionOfType(RuntimeException.class)
+				.isThrownBy(() -> this.github.findMilestoneNumberByTitle(this.repositoryRef, "missing"));
+	}
+
+	@Test
+	public void isOpenIssuesForMilestoneNumberWhenAllClosedThenFalse() throws Exception {
+		String responseJson = "[]";
+		long milestoneNumber = 202;
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThat(this.github.isOpenIssuesForMilestoneNumber(this.repositoryRef, milestoneNumber)).isFalse();
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/issues?per_page=1&milestone=" + milestoneNumber);
+	}
+
+	@Test
+	public void isOpenIssuesForMilestoneNumberWhenOpenIssuesThenTrue() throws Exception {
+		String responseJson = "[\n" +
+				"   {\n" +
+				"      \"url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562\",\n" +
+				"      \"repository_url\":\"https://api.github.com/repos/spring-projects/spring-security\",\n" +
+				"      \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/labels{/name}\",\n" +
+				"      \"comments_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/comments\",\n" +
+				"      \"events_url\":\"https://api.github.com/repos/spring-projects/spring-security/issues/9562/events\",\n" +
+				"      \"html_url\":\"https://github.com/spring-projects/spring-security/pull/9562\",\n" +
+				"      \"id\":851886504,\n" +
+				"      \"node_id\":\"MDExOlB1bGxSZXF1ZXN0NjEwMjMzMDcw\",\n" +
+				"      \"number\":9562,\n" +
+				"      \"title\":\"Add package-list\",\n" +
+				"      \"user\":{\n" +
+				"         \"login\":\"jzheaux\",\n" +
+				"         \"id\":3627351,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"         \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"labels\":[\n" +
+				"         {\n" +
+				"            \"id\":322225043,\n" +
+				"            \"node_id\":\"MDU6TGFiZWwzMjIyMjUwNDM=\",\n" +
+				"            \"url\":\"https://api.github.com/repos/spring-projects/spring-security/labels/in:%20build\",\n" +
+				"            \"name\":\"in: build\",\n" +
+				"            \"color\":\"e8f9de\",\n" +
+				"            \"default\":false,\n" +
+				"            \"description\":\"An issue in the build\"\n" +
+				"         },\n" +
+				"         {\n" +
+				"            \"id\":322225079,\n" +
+				"            \"node_id\":\"MDU6TGFiZWwzMjIyMjUwNzk=\",\n" +
+				"            \"url\":\"https://api.github.com/repos/spring-projects/spring-security/labels/type:%20bug\",\n" +
+				"            \"name\":\"type: bug\",\n" +
+				"            \"color\":\"e3d9fc\",\n" +
+				"            \"default\":false,\n" +
+				"            \"description\":\"A general bug\"\n" +
+				"         }\n" +
+				"      ],\n" +
+				"      \"state\":\"open\",\n" +
+				"      \"locked\":false,\n" +
+				"      \"assignee\":{\n" +
+				"         \"login\":\"rwinch\",\n" +
+				"         \"id\":362503,\n" +
+				"         \"node_id\":\"MDQ6VXNlcjM2MjUwMw==\",\n" +
+				"         \"avatar_url\":\"https://avatars.githubusercontent.com/u/362503?v=4\",\n" +
+				"         \"gravatar_id\":\"\",\n" +
+				"         \"url\":\"https://api.github.com/users/rwinch\",\n" +
+				"         \"html_url\":\"https://github.com/rwinch\",\n" +
+				"         \"followers_url\":\"https://api.github.com/users/rwinch/followers\",\n" +
+				"         \"following_url\":\"https://api.github.com/users/rwinch/following{/other_user}\",\n" +
+				"         \"gists_url\":\"https://api.github.com/users/rwinch/gists{/gist_id}\",\n" +
+				"         \"starred_url\":\"https://api.github.com/users/rwinch/starred{/owner}{/repo}\",\n" +
+				"         \"subscriptions_url\":\"https://api.github.com/users/rwinch/subscriptions\",\n" +
+				"         \"organizations_url\":\"https://api.github.com/users/rwinch/orgs\",\n" +
+				"         \"repos_url\":\"https://api.github.com/users/rwinch/repos\",\n" +
+				"         \"events_url\":\"https://api.github.com/users/rwinch/events{/privacy}\",\n" +
+				"         \"received_events_url\":\"https://api.github.com/users/rwinch/received_events\",\n" +
+				"         \"type\":\"User\",\n" +
+				"         \"site_admin\":false\n" +
+				"      },\n" +
+				"      \"assignees\":[\n" +
+				"         {\n" +
+				"            \"login\":\"rwinch\",\n" +
+				"            \"id\":362503,\n" +
+				"            \"node_id\":\"MDQ6VXNlcjM2MjUwMw==\",\n" +
+				"            \"avatar_url\":\"https://avatars.githubusercontent.com/u/362503?v=4\",\n" +
+				"            \"gravatar_id\":\"\",\n" +
+				"            \"url\":\"https://api.github.com/users/rwinch\",\n" +
+				"            \"html_url\":\"https://github.com/rwinch\",\n" +
+				"            \"followers_url\":\"https://api.github.com/users/rwinch/followers\",\n" +
+				"            \"following_url\":\"https://api.github.com/users/rwinch/following{/other_user}\",\n" +
+				"            \"gists_url\":\"https://api.github.com/users/rwinch/gists{/gist_id}\",\n" +
+				"            \"starred_url\":\"https://api.github.com/users/rwinch/starred{/owner}{/repo}\",\n" +
+				"            \"subscriptions_url\":\"https://api.github.com/users/rwinch/subscriptions\",\n" +
+				"            \"organizations_url\":\"https://api.github.com/users/rwinch/orgs\",\n" +
+				"            \"repos_url\":\"https://api.github.com/users/rwinch/repos\",\n" +
+				"            \"events_url\":\"https://api.github.com/users/rwinch/events{/privacy}\",\n" +
+				"            \"received_events_url\":\"https://api.github.com/users/rwinch/received_events\",\n" +
+				"            \"type\":\"User\",\n" +
+				"            \"site_admin\":false\n" +
+				"         }\n" +
+				"      ],\n" +
+				"      \"milestone\":{\n" +
+				"         \"url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191\",\n" +
+				"         \"html_url\":\"https://github.com/spring-projects/spring-security/milestone/191\",\n" +
+				"         \"labels_url\":\"https://api.github.com/repos/spring-projects/spring-security/milestones/191/labels\",\n" +
+				"         \"id\":5884208,\n" +
+				"         \"node_id\":\"MDk6TWlsZXN0b25lNTg4NDIwOA==\",\n" +
+				"         \"number\":191,\n" +
+				"         \"title\":\"5.5.0-RC1\",\n" +
+				"         \"description\":\"\",\n" +
+				"         \"creator\":{\n" +
+				"            \"login\":\"jzheaux\",\n" +
+				"            \"id\":3627351,\n" +
+				"            \"node_id\":\"MDQ6VXNlcjM2MjczNTE=\",\n" +
+				"            \"avatar_url\":\"https://avatars.githubusercontent.com/u/3627351?v=4\",\n" +
+				"            \"gravatar_id\":\"\",\n" +
+				"            \"url\":\"https://api.github.com/users/jzheaux\",\n" +
+				"            \"html_url\":\"https://github.com/jzheaux\",\n" +
+				"            \"followers_url\":\"https://api.github.com/users/jzheaux/followers\",\n" +
+				"            \"following_url\":\"https://api.github.com/users/jzheaux/following{/other_user}\",\n" +
+				"            \"gists_url\":\"https://api.github.com/users/jzheaux/gists{/gist_id}\",\n" +
+				"            \"starred_url\":\"https://api.github.com/users/jzheaux/starred{/owner}{/repo}\",\n" +
+				"            \"subscriptions_url\":\"https://api.github.com/users/jzheaux/subscriptions\",\n" +
+				"            \"organizations_url\":\"https://api.github.com/users/jzheaux/orgs\",\n" +
+				"            \"repos_url\":\"https://api.github.com/users/jzheaux/repos\",\n" +
+				"            \"events_url\":\"https://api.github.com/users/jzheaux/events{/privacy}\",\n" +
+				"            \"received_events_url\":\"https://api.github.com/users/jzheaux/received_events\",\n" +
+				"            \"type\":\"User\",\n" +
+				"            \"site_admin\":false\n" +
+				"         },\n" +
+				"         \"open_issues\":21,\n" +
+				"         \"closed_issues\":23,\n" +
+				"         \"state\":\"open\",\n" +
+				"         \"created_at\":\"2020-09-16T13:28:03Z\",\n" +
+				"         \"updated_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"         \"due_on\":\"2021-04-12T07:00:00Z\",\n" +
+				"         \"closed_at\":null\n" +
+				"      },\n" +
+				"      \"comments\":0,\n" +
+				"      \"created_at\":\"2021-04-06T23:47:10Z\",\n" +
+				"      \"updated_at\":\"2021-04-07T17:00:00Z\",\n" +
+				"      \"closed_at\":null,\n" +
+				"      \"author_association\":\"MEMBER\",\n" +
+				"      \"active_lock_reason\":null,\n" +
+				"      \"pull_request\":{\n" +
+				"         \"url\":\"https://api.github.com/repos/spring-projects/spring-security/pulls/9562\",\n" +
+				"         \"html_url\":\"https://github.com/spring-projects/spring-security/pull/9562\",\n" +
+				"         \"diff_url\":\"https://github.com/spring-projects/spring-security/pull/9562.diff\",\n" +
+				"         \"patch_url\":\"https://github.com/spring-projects/spring-security/pull/9562.patch\"\n" +
+				"      },\n" +
+				"      \"body\":\"Closes gh-9528\\r\\n\\r\\n<!--\\r\\nFor Security Vulnerabilities, please use https://pivotal.io/security#reporting\\r\\n-->\\r\\n\\r\\n<!--\\r\\nBefore creating new features, we recommend creating an issue to discuss the feature. This ensures that everyone is on the same page before extensive work is done.\\r\\n\\r\\nThanks for contributing to Spring Security. Please provide a brief description of your pull-request and reference any related issue numbers (prefix references with gh-).\\r\\n-->\\r\\n\",\n" +
+				"      \"performed_via_github_app\":null\n" +
+				"   }\n" +
+				"]";
+		long milestoneNumber = 191;
+		this.server.enqueue(new MockResponse().setBody(responseJson));
+
+		assertThat(this.github.isOpenIssuesForMilestoneNumber(this.repositoryRef, milestoneNumber)).isTrue();
+
+		RecordedRequest recordedRequest = this.server.takeRequest(1, TimeUnit.SECONDS);
+		assertThat(recordedRequest.getMethod()).isEqualToIgnoringCase("get");
+		assertThat(recordedRequest.getRequestUrl().toString()).isEqualTo(this.baseUrl + "/repos/spring-projects/spring-security/issues?per_page=1&milestone=" + milestoneNumber);
+	}
+
+}