TestNG：在Eclipse的DataProvider中返回Iterator时出现ClassCastException。

Question

在我的TestNG测试中，我使用了一个DataProvider，该DataProvider返回一个Iterator对象，但当我运行测试时，我得到了一个错误。谁能解释一下为什么会出错，我应该怎么做才能解决这个问题？

Eclipse版本。

Eclipse Java EE IDE for Web Developers.

Version: Oxygen.3a Release (4.7.3a)
Build id: 20180405-1200

Java版本

java version "10.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)

数据提供者

  @DataProvider(name = "SmokeTestData", parallel = true)
public Iterator<SmokeTestData> smokeTestData(ITestContext context) {
    String fileName = context.getCurrentXmlTest().getParameter("filename");
    int numberOfTests = SmokeTestData.getNumberOfTests(fileName, true);
    SmokeTestData[] testSuiteData = new SmokeTestData[numberOfTests];
    for (int i = 1; i <= numberOfTests; i++) {
        testSuiteData[i-1] = new SmokeTestData(fileName, i);
    }
    return (Stream.of(testSuiteData)).iterator();
}

测试

 @Test(description = "Smoke Test", dataProvider = "SmokeTestData", groups =
        {"SmokeTest"})
@Description("Smoke Test")
@Severity(SeverityLevel.NORMAL)
public void smokeTest(SmokeTestData smokeTestData) {
    selectEnv(smokeTestData.getUrl());
    loginPage.get().smoketest(smokeTestData.getEnvironment(), smokeTestData.getEmail(), smokeTestData.getPassword());
    serviceAvailabilityPage.get().smoketest();
    referralRequestStatusPage.get().smoketest();
}

数据

Environment,Url,Email,Password
DE,https://somedomain.com/index.php/login,[email protected],somePW!1
IN,https://somedomain.com/index.php/login,[email protected],somePW!1
NM,https://somedomain.com/index.php/login,[email protected],somePW!1
MI,https://somedomain.com/index.php/login,[email protected],somePW!1
NV,https://somedomain.com/index.php/login,[email protected],somePW!1
AK,https://somedomain.com/index.php/login,[email protected],somePW!1

错误。

java.lang.ClassCastException: data.SmokeTestData cannot be cast to java.base/[Ljava.lang.Object;
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1102)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:844)

先谢谢你的帮助！

Answer 1

我通过完全卸载Eclipse，包括以下文件夹并清空垃圾桶来解决这个问题。

• ~.eclipse
• ~LibraryCachesorg.eclipse.platform.ide
• ~LibrarySaved Application Stateorg.eclipse.platform.ide. savedState。
• ~LibraryPreferencesorg.eclipse.platform.ide.plist。

然后安装Eclipse IDE for Java Developers 2018-09版和TestNG插件。