Function exerciseBindingBehavior

test/binding-expression.spec.js:209–244

(callback)

    let bindingExpression = bindingEngine.createBindingExpression('value', 'foo.bar & numberToString:arg & multiply', bindingMode.twoWay, lookupFunctions);
    let binding = bindingExpression.createBinding(target);
    function exerciseBindingBehavior(callback) {
      let scope = createScopeForTest(source);
      binding.bind(scope);
      expect(bindingBehaviors.numberToString.bind).toHaveBeenCalledWith(binding, scope, 'hello world');
      expect(bindingBehaviors.multiply.bind).toHaveBeenCalledWith(binding, scope);
      expect(target.value).toBe(source.foo.bar);
      let sourceObserver = bindingEngine.observerLocator.getObserver(source.foo, 'bar');
      expect(sourceObserver.hasSubscribers()).toBe(true);
      let argObserver = bindingEngine.observerLocator.getObserver(source, 'arg');
      expect(argObserver.hasSubscribers()).toBe(false);
      expect(binding.targetObserver.hasSubscribers()).toBe(true);
      source.foo.bar = 'xup';
      setTimeout(() => {
        expect(target.value).toBe(source.foo.bar);
        source.arg = 'goodbye world';
        setTimeout(() => {
          expect(target.value).toBe(source.foo.bar);
          target.value = 'burrito';
          target.dispatchEvent(DOM.createCustomEvent('change'));
          setTimeout(() => {
            expect(source.foo.bar).toBe(target.value);
            binding.unbind();
            expect(bindingBehaviors.numberToString.unbind).toHaveBeenCalledWith(binding, scope);
            expect(bindingBehaviors.multiply.unbind).toHaveBeenCalledWith(binding, scope);
            expect(sourceObserver.hasSubscribers()).toBe(false);
            expect(argObserver.hasSubscribers()).toBe(false);
            expect(binding.targetObserver.hasSubscribers()).toBe(false);
            source.foo.bar = 'test';
            setTimeout(() => {
              expect(target.value).toBe('burrito');
              callback();
            }, checkDelay * 2);
          }, checkDelay * 2);
        }, checkDelay * 2);
      }, checkDelay * 2);
    }
    exerciseBindingBehavior(() => exerciseBindingBehavior(done));
  });
});