assertEquals(SimpleType.class, custom.getClass());
assertEquals(1, custom.containedTypeCount());
assertEquals(strC, custom.containedType(0));
assertNull(custom.containedType(1));
// should also be able to access variable name:
assertEquals("X", custom.containedTypeName(0));
// And finally, ensure that we can't create invalid combinations
try {
// Maps must take 2 type parameters, not just one
tf.constructParametricType(Map.class, strC);