Selenium会等待JavaScript完成吗？

我正在使用 Java / Selenium测试 JavaScript API.

我在Java端发出这些命令,

executor.executeScript("setName('Hello');");
// Thread.sleep(2000);
String output = (String)executor.executeScript("return getName()");
assertEquals(output,"Hello");

在JavaScript方面,这是一个异步函数,因此它需要一些时间并设置变量.

function setName(msg) {
    // simulate async call 
    setName(function(){name = msg;},1000);
}

我需要等待这个异步函数完成,然后再转到Java中的下一行,执行assertEquals().

如果不在Java端使用Thread.sleep(),有没有办法实现这一点.

谢谢

解决方法

您可以轻松地要求Selenium等到特定条件成立;在你拥有的,一个替代方案是：

new FluentWait<JavascriptExecutor>(executor) {
  protected RuntimeException timeoutException(
      String message,Throwable lastException) {
    Assert.fail("name was never set");
  }
}.withTimeout(10,SECONDS)
.until(new Predicate<JavascriptExecutor>() {
  public boolean apply(JavascriptExecutor e) {
    return (Boolean)executor.executeScript("return ('Hello' === getName());");
  }
});

但是,那么你基本上测试的是你刚刚编写的内容,并且缺点是如果在调用setName之前设置了name,则不必等待setName完成.我过去做过类似事情的一件事是：

在我的测试库中(用setTimeout垫片替换真正的异步调用),我有这个：

window._junit_testid_ = '*none*';
window._junit_async_calls_ = {};
function _setJunitTestid_(testId) {
  window._junit_testid_ = testId;
}
function _setTimeout_(cont,timeout) {
  var callId = Math.random().toString(36).substr(2);
  var testId = window._junit_testid_;
  window._junit_async_calls_[testId] |= {};
  window._junit_async_calls_[testId][callId] = 1;
  window.setTimeout(function(){
    cont();
    delete(window._junit_async_calls_[testId][callId]);
  },timeout);
}
function _isTestDone_(testId) {
  if (window._junit_async_calls_[testId]) {
    var thing = window._junit_async_calls_[testId];
    for (var prop in thing) {
      if (thing.hasOwnProperty(prop)) return false;
    }
    delete(window._junit_async_calls_[testId]);
  }
  return true;
}

在我的库的其余部分,每当我需要设置稍后发生的事情时,我使用_setTimeout_而不是window.setTimeout.然后,在我的硒测试中,我做了这样的事情：

// First,this routine is in a library somewhere
public void waitForTest(JavascriptExecutor executor,String testId) {
  new FluentWait<JavascriptExecutor>(executor) {
    protected RuntimeException timeoutException(
        String message,Throwable lastException) {
      Assert.fail(testId + " did not finish async calls");
    }
  }.withTimeout(10,SECONDS)
  .until(new Predicate<JavascriptExecutor>() {
    public boolean apply(JavascriptExecutor e) {
      return (Boolean)executor.executeScript(
          "_isTestDone_('" + testId + "');");
    }
  });
}
 
// Inside an actual test:
@Test public void serverPingTest() {
  // Do stuff to grab my WebDriver instance
  // Do this before any interaction with the app
  driver.executeScript("_setJunitTestid_('MainAppTest.serverPingTest');");
  // Do other stuff including things that fire off what would be async calls
  // but now call stuff in my testing library instead.
  // ...
  // Now I need to wait for all the async stuff to finish:
  waitForTest(driver,"MainAppTest.serverPingTest");
  // Now query stuff about the app,assert things if needed
}

请注意,如果需要,您可以多次调用waitForTest,只要您需要该测试暂停,直到完成所有异步操作.

Selenium会等待JavaScript完成吗？

解决方法

猜你在找的JavaScript相关文章