When a test method or constructor has only a single parameter, annotating that parameter directly with @TestParameter is simpler and more concise than annotating the method with @TestParameters YAML mappings.

@Test
@TestParameters("{count: 1}")
@TestParameters("{count: 2}")
@TestParameters("{count: 3}")
public void myTest(int count) {
  ...
}

@Test
public void myTest(@TestParameter({"1", "2", "3"}) int count) {
  ...
}

When the values of a boolean, Boolean, or Enum parameter are exhaustively listed (excluding null), the explicit values can be omitted from @TestParameter because it injects all possible values automatically:

@Test
@TestParameters({"{enabled: true}", "{enabled: false}"})
public void testFlag(boolean enabled) {
  ...
}

@Test
@TestParameters({
  "{suit: HEARTS}",
  "{suit: DIAMONDS}",
  "{suit: CLUBS}",
  "{suit: SPADES}",
})
public void testSuit(Suit suit) {
  ...
}

@Test
public void testFlag(@TestParameter boolean enabled) {
  ...
}

@Test
public void testSuit(@TestParameter Suit suit) {
  ...
}