@Test
public void whenCreateClassToInstanceMap_thenCreated() {
final ClassToInstanceMap<Number> numbers = MutableClassToInstanceMap.create();
numbers.putInstance(Integer.class, 1);
numbers.putInstance(Double.class, 1.5);
assertEquals(1, numbers.get(Integer.class));
assertEquals(1.5, numbers.get(Double.class));
}
public void testPutAndGetInstance() {
assertNull(map.putInstance(Integer.class, new Integer(5)));
Integer oldValue = map.putInstance(Integer.class, new Integer(7));
assertEquals(5, (int) oldValue);
Integer newValue = map.getInstance(Integer.class);
assertEquals(7, (int) newValue);
// Won't compile: map.putInstance(Double.class, new Long(42));
}
public void testConstraint() {
/**
* We'll give ourselves a pass on testing all the possible ways of breaking the constraint,
* because we know that newClassMap() is implemented using ConstrainedMap which is itself
* well-tested. A purist would object to this, but what can I say, we're dirty cheaters.
*/
map.put(Integer.class, new Integer(5));
try {
map.put(Double.class, new Long(42));
fail();
} catch (ClassCastException expected) {
}
// Won't compile: map.put(String.class, "x");
}
public void testNull() {
try {
map.put(null, new Integer(1));
fail();
} catch (NullPointerException expected) {
}
map.putInstance(Integer.class, null);
assertNull(map.get(Integer.class));
assertNull(map.getInstance(Integer.class));
map.put(Long.class, null);
assertNull(map.get(Long.class));
assertNull(map.getInstance(Long.class));
}
public void testPrimitiveAndWrapper() {
assertNull(map.getInstance(int.class));
assertNull(map.getInstance(Integer.class));
assertNull(map.putInstance(int.class, 0));
assertNull(map.putInstance(Integer.class, 1));
assertEquals(2, map.size());
assertEquals(0, (int) map.getInstance(int.class));
assertEquals(1, (int) map.getInstance(Integer.class));
assertEquals(0, (int) map.putInstance(int.class, null));
assertEquals(1, (int) map.putInstance(Integer.class, null));
assertNull(map.getInstance(int.class));
assertNull(map.getInstance(Integer.class));
assertEquals(2, map.size());
}
