JUnit malformed declaration

Reports JUnit test member declarations that are malformed and are likely not recognized by the JUnit test framework. The following problems are reported by this inspection:

Test classes that can't be constructed
Fields annotated by @RegisterExtension that have the wrong type or are not declared as static when it is required
Static or private inner classes annotated with @Nested
Parameterized tests that are defined without a source
Parameterized tests with a @MethodSource that has an unknown, non-static or no-arg target
Mismatched types between parameterized test method parameter and the specified @ValueSource or @EnumSource values
Tests that are annotated by more than one of @Test, @ParameterizedTest or @RepeatedTest
setup() or tearDown() methods that are not public, whose return type is not void or take arguments
suite() methods that are private, take arguments or are not static
Methods annotated by @BeforeClass, @AfterClass, @BeforeAll or @AfterAll that are not public, not static, whose return type is not void or do not have a valid parameter list
Methods annotated by @Before, @After, @BeforeEach or @AfterEach that are not public, whose return type is not void or take arguments
Injected RepetitionInfo in @BeforeAll or @AfterAll methods
Injected RepetitionInfo in @BeforeEach or @AfterEach methods that are used by @Test annotated tests
Fields and methods annotated by @DataPoint or @DataPoints that are not public or not static
Fields and methods annotated by @Rule that are not public or not a subtype of TestRule or MethodRule
Fields and methods annotated by @ClassRule that are not public, not static or not a subtype of TestRule
Methods inside a subclass of TestCase with a test prefix that are not public, whose return type is not void, take arguments or are static
Methods annotated by @Test that are not public, whose return type is not void, take arguments or are static

Note that in Kotlin, suspending functions do have arguments and a non-void return type. Therefore, they also will not be executed by the JUnit test runner. This inspection will also report about this problem.

Malformed @Before method example (Java):

@Before private int foo(int arg) { ... }

After the quick-fix is applied:

@Before public void foo() { ... }

Missing method source example (Kotlin):

class Example {
  @MethodSource("parameters")
  @ParameterizedTest
  fun foo(param: String) { ... }
}

After the quick-fix is applied:

class Example {
  @MethodSource("parameters")
  @ParameterizedTest
  fun foo(param: String) { ... }

  companion object {
    @JvmStatic
    fun parameters(): Stream<Arguments> {
      TODO("Not yet implemented")
    }
  }
}

Use the inspection options to specify annotations. Any parameter annotated with one of these annotations will not be reported.

Inspection options

Option	Type	Default
Ignore test parameter if it is annotated by	StringList	[mockit.Mocked, org.junit.jupiter.api.io.TempDir]

Inspection Details
Available in:	IntelliJ IDEA 2023.3, Qodana for JVM 2023.3
Plugin:	Java, 233.SNAPSHOT

Last modified: 13 July 2023