Parameterized test class without data provider method

Reports JUnit 4 parameterized test classes that are annotated with @RunWith(Parameterized.class) but either do not include a data provider method annotated with @Parameterized.Parameters or this method has an incorrect signature. Such test classes cannot be run. The data provider method should be public and static and have a return type of Iterable or Object[].

Suggests creating an empty parameter provider method or changing the signature of the incorrect data provider method.

Example:

@RunWith(Parameterized.class)
public class ImportantTest {
  private int input;
  private int expected;

  ImportantTest(int input, int expected) {
    this.input = input;
    this.expected = expected;
  }

  // ... test cases
}

After the quick-fix is applied:

@RunWith(Parameterized.class)
public class ImportantTest {
  private int input;
  private int expected;

  ImportantTest(int input, int expected) {
    this.input = input;
    this.expected = expected;
  }

  @Parameters
  public static Iterable<Object[]> parameters() {
    return null;
  }

  // ... test cases
}

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

Last modified: 13 July 2023