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BAEL-4437 - System Rules (#10047) 

Co-authored-by: Jonathan Cook <jcook@sciops.esa.int>
This commit is contained in:
Jonathan Cook 2020-09-17 23:22:49 +02:00 committed by GitHub
parent 4c39bcd6be
commit f6adcd0cb3
12 changed files with 288 additions and 1 deletions
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3
testing-modules/pom.xml
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@ -41,7 +41,8 @@
<module>junit-5-advanced</module>
<module>xmlunit-2</module>
<module>junit-4</module>
<module>testing-libraries</module>
<module>testing-libraries</module>
<module>testing-libraries-2</module>
<module>powermock</module>
</modules>

43
testing-modules/testing-libraries-2/pom.xml Normal file
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<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>testing-libraries-2</artifactId>
<name>testing-libraries-2</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>testing-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.github.stefanbirkner</groupId>
<artifactId>system-rules</artifactId>
<version>${system-rules.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.github.stefanbirkner</groupId>
<artifactId>system-lambda</artifactId>
<version>${system-lambda.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>testing-libraries</finalName>
<resources>
<resource>
<directory>src/test/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<properties>
<system-rules.version>1.19.0</system-rules.version>
<system-lambda.version>1.0.0</system-lambda.version>
</properties>
</project>

19
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/ClearSystemPropertiesWithRuleUnitTest.java Normal file
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package com.baeldung.systemrules;
import static org.junit.Assert.assertNull;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.ClearSystemProperties;
public class ClearSystemPropertiesWithRuleUnitTest {
@Rule
public final ClearSystemProperties userNameIsClearedRule = new ClearSystemProperties("user.name");
@Test
public void givenClearUsernameProperty_whenGetUserName_thenNull() {
assertNull(System.getProperty("user.name"));
}
}

26
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/ProvidesSystemPropertyUnitTest.java Normal file
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package com.baeldung.systemrules;
import static com.github.stefanbirkner.systemlambda.SystemLambda.restoreSystemProperties;
import static org.junit.Assert.assertEquals;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
class ProvidesSystemPropertyUnitTest {
@BeforeAll
static void setUpBeforeClass() throws Exception {
System.setProperty("log_dir", "/tmp/baeldung/logs");
}
@Test
void givenSetSystemProperty_whenGetLogDir_thenLogDirIsProvidedSuccessfully() throws Exception {
restoreSystemProperties(() -> {
System.setProperty("log_dir", "test/resources");
assertEquals("log_dir should be provided", "test/resources", System.getProperty("log_dir"));
});
assertEquals("log_dir should be provided", "/tmp/baeldung/logs", System.getProperty("log_dir"));
}
}

44
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/ProvidesSystemPropertyWithRuleUnitTest.java Normal file
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package com.baeldung.systemrules;
import static org.junit.Assert.assertEquals;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.ProvideSystemProperty;
public class ProvidesSystemPropertyWithRuleUnitTest {
@Rule
public final ProvideSystemProperty providesSystemPropertyRule = new ProvideSystemProperty("log_dir", "test/resources").and("another_property", "another_value");
@Rule
public final ProvideSystemProperty providesSystemPropertyFromFileRule = ProvideSystemProperty.fromResource("/test.properties");
@BeforeClass
public static void setUpBeforeClass() {
setLogs();
}
@AfterClass
public static void tearDownAfterClass() throws Exception {
System.out.println(System.getProperty("log_dir"));
}
@Test
public void givenProvideSystemProperty_whenGetLogDir_thenLogDirIsProvidedSuccessfully() {
assertEquals("log_dir should be provided", "test/resources", System.getProperty("log_dir"));
}
@Test
public void givenProvideSystemPropertyFromFile_whenGetName_thenNameIsProvidedSuccessfully() {
assertEquals("name should be provided", "baeldung", System.getProperty("name"));
assertEquals("version should be provided", "1.0", System.getProperty("version"));
}
private static void setLogs() {
System.setProperty("log_dir", "/tmp/baeldung/logs");
}
}

24
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemErrPrintlnUnitTest.java Normal file
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package com.baeldung.systemrules;
import static com.github.stefanbirkner.systemlambda.SystemLambda.tapSystemErr;
import org.junit.Assert;
import org.junit.jupiter.api.Test;
class SystemErrPrintlnUnitTest {
@Test
void givenTapSystemErr_whenInvokePrintln_thenOutputIsReturnedSuccessfully() throws Exception {
String text = tapSystemErr(() -> {
printError("An error occurred Baeldung Readers!!");
});
Assert.assertEquals("An error occurred Baeldung Readers!!", text.trim());
}
private void printError(String output) {
System.err.println(output);
}
}

25
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemErrPrintlnWithRuleUnitTest.java Normal file
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@ -0,0 +1,25 @@
package com.baeldung.systemrules;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.SystemErrRule;
public class SystemErrPrintlnWithRuleUnitTest {
@Rule
public final SystemErrRule systemErrRule = new SystemErrRule().enableLog();
@Test
public void givenSystemErrRule_whenInvokePrintln_thenLogSuccess() {
printError("An Error occurred Baeldung Readers!!");
Assert.assertEquals("An Error occurred Baeldung Readers!!", systemErrRule.getLog()
.trim());
}
private void printError(String output) {
System.err.println(output);
}
}

23
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemExitUnitTest.java Normal file
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package com.baeldung.systemrules;
import static org.junit.Assert.assertEquals;
import static com.github.stefanbirkner.systemlambda.SystemLambda.catchSystemExit;
import org.junit.jupiter.api.Test;
class SystemExitUnitTest {
@Test
void givenCatchSystemExit_whenAppCallsSystemExit_thenStatusIsReturnedSuccessfully() throws Exception {
int statusCode = catchSystemExit(() -> {
exit();
});
assertEquals("status code should be 1:", 1, statusCode);
}
private void exit() {
System.exit(1);
}
}

22
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemExitWithRuleUnitTest.java Normal file
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package com.baeldung.systemrules;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.ExpectedSystemExit;
public class SystemExitWithRuleUnitTest {
@Rule
public final ExpectedSystemExit exitRule = ExpectedSystemExit.none();
@Test
public void givenSystemExitRule_whenAppCallsSystemExit_thenExitRuleWorkssAsExpected() {
exitRule.expectSystemExitWithStatus(1);
exit();
}
private void exit() {
System.exit(1);
}
}

27
testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemInUnitTest.java Normal file
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package com.baeldung.systemrules;
import static com.github.stefanbirkner.systemlambda.SystemLambda.withTextFromSystemIn;
import static org.junit.Assert.assertEquals;
import java.util.Scanner;
import org.junit.jupiter.api.Test;
class SystemInUnitTest {
@Test
void givenTwoNames_whenSystemInMock_thenNamesJoinedTogether() throws Exception {
withTextFromSystemIn("Jonathan", "Cook").execute(() -> {
assertEquals("Names should be concatenated", "Jonathan Cook", getFullname());
});
}
private String getFullname() {
try (Scanner scanner = new Scanner(System.in)) {
String firstName = scanner.next();
String surname = scanner.next();
return String.join(" ", firstName, surname);
}
}
}

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testing-modules/testing-libraries-2/src/test/java/com/baeldung/systemrules/SystemInWithRuleUnitTest.java Normal file
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package com.baeldung.systemrules;
import static org.junit.Assert.assertEquals;
import java.util.Scanner;
import org.junit.Rule;
import org.junit.Test;
import org.junit.contrib.java.lang.system.TextFromStandardInputStream;
import static org.junit.contrib.java.lang.system.TextFromStandardInputStream.emptyStandardInputStream;
public class SystemInWithRuleUnitTest {
@Rule
public final TextFromStandardInputStream systemInMock = emptyStandardInputStream();
@Test
public void givenTwoNames_whenSystemInMock_thenNamesJoinedTogether() {
systemInMock.provideLines("Jonathan", "Cook");
assertEquals("Names should be concatenated", "Jonathan Cook", getFullname());
}
private String getFullname() {
try (Scanner scanner = new Scanner(System.in)) {
String firstName = scanner.next();
String surname = scanner.next();
return String.join(" ", firstName, surname);
}
}
}

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testing-modules/testing-libraries-2/src/test/resources/test.properties Normal file
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@ -0,0 +1,2 @@
name=baeldung
version=1.0