DoubleStreamSubject

[perceptron8]

Please, consider:

• Truth8.assertThat(IntStream),
• Truth8.assertThat(LongStream),
• Truth8.assertThat(DoubleStream).

[perceptron8]

As a workaround, I use Thruth.assertThat(actual.toArray()).isEqualTo(expected.toArray()), but that's a little more verbose.

[kluever]

Hmm, seems like we could just change Stream to BaseStream and everything should still work. But there might be a reason we didn't do this...I'll take a look.

[kluever]

OK, turns out it wasn't as simple, because without custom LongStreamSubject, this assertion would fail:

  // LongStream.of() upcasts the ints to longs
  assertThat(LongStream.of(1, 2, 3)).containsExactly(1, 2, 3);
  // but containsExactly(Object...) boxes the ints to Integers, and the assertion fails

So we're going to go ahead and add IntStreamSubject and LongStreamSubject. The API for DoubleStreamSubject will be a bit more controversial, and we're leaving it as a TODO for now.

[kluever]

FWIW, DoubleStream's are about 1/3 as common as IntStream or LongStream inside of Google.