public SortedSet<Sdk> getKnownSdks() {
    return new TreeSet<>(knownSdks.values());
  }
@Test
  public void getKnownSdks_shouldReturnAll() throws Exception {
    assertThat(sdkCollection.getKnownSdks())
        .containsExactly(fakeSdk1234, fakeSdk1235, fakeSdk1236, fakeUnsupportedSdk1237)
        .inOrder();
  }