BAEL-4836 - Mocking Static Methods with Mockito (#10580)

* BAEL-4706 - Spring Boot with Spring Batch

* BAEL-3948 - Fix test(s) in spring-batch which leaves repository.sqlite
changed

* BAEL-4736 - Convert JSONArray to List of Object using camel-jackson

* BAEL-4756 - Mockito MockSettings

* BAEL-4756 - Mockito MockSettings - fix spelling

* BAEL-2674 - Upgrade the Okhttp article

* BAEL-4204 - Adding Interceptors in OkHTTP

* BAEL-4836 - Mocking Static Methods with Mockito

Co-authored-by: Jonathan Cook <jcook@sciops.esa.int>

testing-modules/mockito-3/.gitignore

@@ -0,0 +1,4 @@
+/target/
+/.settings/
+/.classpath
+/.project

testing-modules/mockito-3/pom.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>mockito-3</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>mockito-3</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../../</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <mockito.version>3.8.0</mockito.version>
+        <assertj.version>3.8.0</assertj.version>
+    </properties>
+
+</project>

testing-modules/mockito-3/src/main/java/com/baeldung/mockito/mockedstatic/StaticUtils.java

@@ -0,0 +1,22 @@
+package com.baeldung.mockito.mockedstatic;
+
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class StaticUtils {
+
+    private StaticUtils() {
+    }
+
+    public static List<Integer> range(int start, int end) {
+        return IntStream.range(start, end)
+            .boxed()
+            .collect(Collectors.toList());
+    }
+
+    public static String name() {
+        return "Baeldung";
+    }
+
+}

testing-modules/mockito-3/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

testing-modules/mockito-3/src/test/java/com/baeldung/mockito/mockedstatic/MockedStaticUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.mockito.mockedstatic;
+
+import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.util.Arrays;
+
+class MockedStaticUnitTest {
+
+    @Test
+    void givenStaticMethodWithNoArgs_whenMocked_thenReturnsMockSuccessfully() {
+        assertThat(StaticUtils.name()).isEqualTo("Baeldung");
+
+        try (MockedStatic<StaticUtils> utilities = Mockito.mockStatic(StaticUtils.class)) {
+            utilities.when(StaticUtils::name).thenReturn("Eugen");
+            assertThat(StaticUtils.name()).isEqualTo("Eugen");
+        }
+
+        assertThat(StaticUtils.name()).isEqualTo("Baeldung");
+    }
+
+    @Test
+    void givenStaticMethodWithArgs_whenMocked_thenReturnsMockSuccessfully() {
+        assertThat(StaticUtils.range(2, 6)).containsExactly(2, 3, 4, 5);
+
+        try (MockedStatic<StaticUtils> utilities = Mockito.mockStatic(StaticUtils.class)) {
+            utilities.when(() -> StaticUtils.range(2, 6))
+                .thenReturn(Arrays.asList(10, 11, 12));
+
+            assertThat(StaticUtils.range(2, 6)).containsExactly(10, 11, 12);
+        }
+
+        assertThat(StaticUtils.range(2, 6)).containsExactly(2, 3, 4, 5);
+    }
+
+}

testing-modules/pom.xml

@@ -24,6 +24,7 @@
         <module>load-testing-comparison</module>
         <module>mockito</module>
 	<module>mockito-2</module>
+	<module>mockito-3</module>	
         <module>hamcrest</module>
         <module>mocks</module>
         <module>mockserver</module>