[lang-ref] ( test_immutable_set ) ( kotlin )

@Test
fun testImmutableSet() {
	val itemsMutable   = mutableSetOf("A", "B", "C")
	val itemsImmutable = setOf("A", "B", "C")

	assertEquals(itemsMutable.size, 3)
	assertEquals(itemsImmutable.size, 3)

	itemsMutable.add("D")
	assertEquals(itemsMutable.size, 4)

	// cannot build
	// itemsImmutable.add("D")
}