add more debouncer tests

test/unit/utils.html

@@ -94,6 +94,71 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
     });
 
+    test('debounce flushing', function(done) {
+
+      var called = 0;
+      var cb = function() {
+        called++;
+      };
+
+      window.el1.debounce('foo', cb);
+      window.el1.flushDebouncer('foo');
+      window.el1.debounce('foo', cb);
+
+      setTimeout(function() {
+        assert.equal(called, 2, 'debounce should be called twice');
+        done();
+      }, 100);
+
+    });
+
+    test('debounce state', function(done) {
+
+      window.el1.debounce('foo', function() {
+        assert.equal(window.el1.isDebouncerActive('foo'), false, 'debouncer is inactive after resolution');
+        done();
+      });
+
+      assert.equal(window.el1.isDebouncerActive('foo'), true, 'debouncer is active immediately after triggering');
+
+    });
+
+    test('debounce cancelling', function(done) {
+
+      var triggered = false;
+
+      window.el1.debounce('foo', function() {
+        triggered = true;
+      });
+      window.el1.cancelDebouncer('foo');
+      assert.equal(window.el1.isDebouncerActive('foo'), false, 'debouncer is inactive after cancelling');
+
+      setTimeout(function() {
+        assert.equal(triggered, false, 'debounce never fired');
+        done();
+      }, 100);
+
+    });
+
+    test('duplicate debouncer assignment', function(done) {
+
+      var a, b;
+
+      window.el1.debounce('foo', function() {
+        a = 'foo';
+      });
+      window.el1.debounce('foo', function() {
+        b = 'bar';
+      });
+
+      setTimeout(function() {
+        assert.equal(a, undefined, 'first debouncer was never fired');
+        assert.equal(b, 'bar', 'only the second debouncer callback was executed');
+        done();
+      }, 100);
+
+    });
+
   });
 
 </script>