### Question:
VersionChecker { @VisibleForTesting static <T extends Comparable<? super T>> boolean le(T a, T b) { return a.compareTo(b) <= 0; } VersionChecker(Function<String, V> converter); @VisibleForTesting boolean compatibleVersion(String acceptableVersionRange, String actualVersion);  }### Answer:
@Test public void testComparators_LE() { Assert.assertTrue(VersionChecker.le(0, 1)); Assert.assertTrue(VersionChecker.le(1, 1)); Assert.assertFalse(VersionChecker.le(2, 1)); }