foreachoutside.java

// or even more plain:
testCases.foreach((case) -> {
  // given
  Object given = case.given;
  Object expected = case.expected;
  
  it.should("return [%s] when applied to [%s]", given, expected, system -> {
    // when
    Object got = system.doThing(given);
  
    // then
    assertThat(got).isEqualTo(expected);
  });
});

generatingtests.java

it.should("return an expected value").forAll(testCases, (system, given, expected) -> {
  // when
  Object got = system.doThing(given);
  
  // then
  assertThat(got).isEqualTo(expected);
});