add more unit tests

tests/reflect.spec.ts

@@ -135,17 +135,23 @@ describe('Reflector', () => {
       public c: string;
     }
 
+    @Metadata.set('foo', 'fifth')
+    class C extends A {}
+
     class Noop {
       public b: string;
     }
 
     const a = new A();
     const b = new B();
+    const c = new C();
     const noop = new Noop();
     expect(reflector.get('foo', A)).toEqual('first');
     expect(reflector.get('foo', a)).toEqual('first');
     expect(reflector.get('foo', B)).toEqual('first');
     expect(reflector.get('foo', b)).toEqual('first');
+    expect(reflector.get('foo', C)).toEqual('fifth');
+    expect(reflector.get('foo', c)).toEqual('fifth');
     expect(reflector.get('foo', a, 'b')).toEqual('second');
     expect(reflector.get('foo', A, 'b')).toEqual('second');
     expect(reflector.get('foo', B, 'b')).toEqual('third');