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→JUnit Assertions
assertThrows(Exception.class, ()-> {functionCallThatThrowsError(params);})
assertThrows(Exception.class, ()-> {functionCallThatThrowsError(params);})
assertDoesNotThrows(Exception.class, ()-> {functionCallThatDoesNotThrowsError(params);})
assertDoesNotThrows( ()-> {functionCallThatDoesNotThrowsError(params);})
assertTimeoutPreemptively
assertTimeoutPreemptively(Duration.ofSeconds(3), () -> { demoUtils.checkTimeout(); }, "Method should execute in 3 seconds");
=== Run tests in order ===
By default the order of the tests is deterministic but not obious, you can force the order<syntaxhighlight lang="java">
// MethodOrderer.DisplayName, MethodOrderer..MethodName, MethodOrderer.Random, MethodOrderer.OrderAnnotation
@TestMethodOrder(MethodOrderer.DisplayName.class)
class DemoUtilsTest {
...
@DisplayName("Equals and not equals")
void testEqualsAndNotEquals()...
// ----------------------------------------------
@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
class DemoUtilsTest {
...
@DisplayName("Equals and not equals")
@Order(1)
void testEqualsAndNotEquals()...
</syntaxhighlight>
=== Configure maven to run tests ===
pom.xml<syntaxhighlight lang="xml">
<!-- Spring Boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- Java -->
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>3.0.0-M5</version>
<scope>test</scope>
</dependency>
</syntaxhighlight>
=== Code coverage ===
IntelliJ has built-in support for code coverage Maven can too, requires plugin like maven-surefire-report-plugin<syntaxhighlight lang="xml">
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-report-plugin</artifactId>
<version>3.0.0-M5</version>
<executions>
<execution>
<phase>test</phase>
<goals>
<goal>report</goal>
<goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</syntaxhighlight>mvn clean test
mvn site -DgenerateReports=false
<br /><syntaxhighlight lang="xml">
// at the surefire plugin
....
<configuration>
<testFailureIgnore>true</testFailureIgnore>
<statelessTestsetReporter implementation="org.apache.maven.plugin.surefire.extensions.junit5.JUnit5Xml30StatelessReporter">
<usePhrasedTestCaseMethodName>true</usePhrasedTestCaseMethodname>
</statelessTestsetReporter>
</configuration>
</plugin>
.....
</syntaxhighlight>
=== JaCoCo (Java Code Coverage) ===
<syntaxhighlight lang="xml">
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.7</version>
<executions>
<execution>
<id>jacoco-prepare</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>jacoco-report</id>
<phase>test</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
....
....
</syntaxhighlight>
=== Disable tests ===
<syntaxhighlight lang="java">
class ConditionalTest {
@Test
@Disabled("Dont run this test until ticket @34 is solved")
void basicTest() {}
@Test
@EnabledOnOs(OS.WINDOWS, OS.MAC, OS.LINUX)
void testForAllSystems() {}
@Test
@EnabledOnJre(JRE.JAVA_17)
void testOnJavaVersion() {}
@Test
@EnabledOnJreRange(min=JRE.JAVA_13, max=JRE.JAVA_18) // If only min provided works until latest java
void testOnJavaVersionRange() {}
@Test
@EnabledIfSystemProperty(named="SOMEPROPERTYNAME", matches="SOMEVALUE")
void testOnJavaVersion() {}
@Test
@EnabledIfEnvironmentVariable(named="SOMEPROPERTYNAME", matches="SOMEVALUE")
void testOnJavaVersion() {}
}
</syntaxhighlight>
=== Parameterized Tests ===
<syntaxhighlight lang="java">
// @parameterizedTest
@parameterizedTest(name="value={0}, expected={1}")
/* @CsvSource({
"1,1",
"2,2",
"3,Fizz",
"4,4",
"5,Buzz"
})*/
@CsvFileSource(resources="/small-test-data.csv") // src/test/resources/small-test-data.csv
void testCsvData(int value, String expected){
assertEquals(expected, FizzBuzz.compute(value));
}
</syntaxhighlight>
==Example: Spring Boot with Data JPA and in memory database H2==
==Example: Spring Boot with Data JPA and in memory database H2==