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config.js：無法爲元素找到可測性 - 量角器
exports.config = {
seleniumAddress: 'http://localhost:4444/wd/hub',
specs: ['todo-spec.js', 'landing-page-spec.js']
};
着陸page.spec.js：
describe('homepage', function() {
it('navigates to the find page when clicking "try now"', function() {
browser.get('http://localhost:3002');
element(by.css('button.x-button')).click();
var x = element(by.css('h2:first-of-type'));
expect(x.getText()).toEqual("hello world");
});
});
當我運行的配置文件，它就會通過todo- spec.js罰款，然後開始做着陸page.spec.js在其中加載我的web應用程序，然後失敗，出現此錯誤：
Failures: 1) VEPO homepage navigates to the find page when clicking "try now" Message:
Failed: Error while waiting for Protractor to sync with the page: "Could not find testability for element." Stack:
Error: Error while waiting for Protractor to sync with the page: "Could not find testability for element."
at /usr/local/lib/node_modules/protractor/built/browser.js:269:23
at ManagedPromise.invokeCallback_ (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:1379:14)
at TaskQueue.execute_ (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2913:14)
at TaskQueue.executeNext_ (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2896:21)
at /usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2775:27
at /usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:639:7
at process._tickCallback (node.js:382:9)Error
at ElementArrayFinder.applyAction_ (/usr/local/lib/node_modules/protractor/built/element.js:397:27)
at ElementArrayFinder._this.(anonymous function) [as click] (/usr/local/lib/node_modules/protractor/built/element.js:100:30)
at ElementFinder.(anonymous function) [as click] (/usr/local/lib/node_modules/protractor/built/element.js:728:22)
at Object.<anonymous> (/Users/Ben/Development/vepo/app/test/landing-page-spec.js:4:43)
at /usr/local/lib/node_modules/protractor/node_modules/jasminewd2/index.js:94:23
at new ManagedPromise (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:1082:7)
at controlFlowExecute (/usr/local/lib/node_modules/protractor/node_modules/jasminewd2/index.js:80:18)
at TaskQueue.execute_ (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2913:14)
at TaskQueue.executeNext_ (/usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2896:21)
at /usr/local/lib/node_modules/protractor/node_modules/selenium-webdriver/lib/promise.js:2820:25
From: Task: Run it("navigates to the find page when clicking "try now"") in control flow
at Object.<anonymous> (/usr/local/lib/node_modules/protractor/node_modules/jasminewd2/index.js:79:14)
From asynchronous test:
Error
at Suite.<anonymous> (/Users/Ben/Development/vepo/app/test/landing-page-spec.js:2:3)
at Object.<anonymous> (/Users/Ben/Development/vepo/app/test/landing-page-spec.js:1:1)
at Module._compile (module.js:398:26)
at Object.Module._extensions..js (module.js:405:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
2 specs, 1 failure Finished in 9.143 seconds [21:11:17] I/launcher - 0 instance(s) of WebDriver still running [21:11:17] I/launcher - chrome
#01 failed 1 test(s) [21:11:17] I/launcher - overall: 1 failed spec(s) [21:11:17] E/launcher - Process exited with error code 1
什麼是錯誤的原因？