+
+ @Test
+ public void testEmptyCopy() {
+ final var orig = MutableUnsignedLongSet.of();
+ assertSame(ImmutableUnsignedLongSet.of(), orig.immutableCopy());
+ final var copy = orig.mutableCopy();
+ assertEquals(orig, copy);
+ assertNotSame(orig, copy);
+ }
+
+ @Test
+ public void testMutableCopy() {
+ final var orig = MutableUnsignedLongSet.of();
+ orig.add(-1);
+ assertEquals("MutableUnsignedLongSet{span=[18446744073709551615..18446744073709551615], size=1}",
+ orig.toString());
+
+ final var copy = orig.mutableCopy();
+ assertEquals(orig, copy);
+ assertNotSame(orig, copy);
+
+ orig.add(-2);
+ assertNotEquals(orig, copy);
+ assertEquals("MutableUnsignedLongSet{span=[18446744073709551614..18446744073709551615], size=1}",
+ orig.toString());
+ }
+
+ @Test
+ public void testWriteRangesTo() throws IOException {
+ ImmutableUnsignedLongSet.of().writeRangesTo(mock(DataOutput.class), 0);
+ }
+
+ @Test
+ public void testWriteRangesToViolation() {
+ final var ex = assertThrows(IOException.class,
+ () -> ImmutableUnsignedLongSet.of().writeRangesTo(mock(DataOutput.class), 1));
+ assertEquals("Mismatched size: expected 0, got 1", ex.getMessage());
+ }