Support @TestPropertySource as a repeated annotation

[gebezs]

TestPropertySource is inherited in case of class hierarchy however it is not inherited in meta-annotation hierarchy.
The lack of this is made clear by @sbrannen in his answer: https://stackoverflow.com/a/26183692
He says:

The algorithm that the Spring Framework uses when searching for an annotation stops once it has found the first occurrence of the sought annotation.

Expected behaviour

The settings from the @CustomTest and MyTest should merged as it is merged in case of class inheritance.

@TestPropertySource(properties = { "property-a=value-a", "property-b=value-b" })
public @interface CustomTest {
}

@CustomTest
@TestPropertySource(properties = { "property-a=value-x", "property-c=value-c" })
public class MyTest {
  @Value("${property-a}")
  private String propertyA;
  @Value("${property-b}")
  private String propertyB;
  @Value("${property-c}")
  private String propertyC;

  @Test
  public void test() {
    assertEquals("value-x", propertyA);
    assertEquals("value-b", propertyB);
    assertEquals("value-c", propertyC);
  }
}

Rationale

It could give much more flexibility in tests.

[antkorwin]

This is same as #21986 and already fixed here #23320

[sbrannen]

This is same as #21986 and already fixed here #23320

Indeed. Thanks for pointing that out.

For the sake of completeness, I tested the following against master (i.e., the upcoming Spring Framework 5.2), and it passes.

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@TestPropertySource(properties = { "property-a=value-a", "property-b=value-b" })
@interface CustomTest {
}

@RunWith(SpringRunner.class)
@ContextConfiguration
@TestPropertySource(properties = { "property-a=value-x", "property-c=value-c" })
@CustomTest
public class MyTest {

	@Value("${property-a}")
	private String propertyA;

	@Value("${property-b}")
	private String propertyB;

	@Value("${property-c}")
	private String propertyC;

	@Test
	public void test() {
		assertEquals("value-x", propertyA);
		assertEquals("value-b", propertyB);
		assertEquals("value-c", propertyC);
	}

	@Configuration
	static class Config {}
}

I am therefore closing this issue as a duplicate of gh-23320.

[gebezs]

Great news. @antkorwin, thanks for fixing this.