我有一个Selenium WebDriver / JUnit测试，它通过<input type="file">元素测试Windows 10中的文件上传。
File file = new File(filePath);
driver.findElement(By.xpath("//input[@type='file']")).sendKeys(file.getAbsolutePath());
Browse按钮的HTML：
<label _ngcontent-cxx="" class="modal-button" for="file"> Browse
<input _ngcontent-cxx="" accept=".docx, .png, .pdf, .xlsx, .doc, .jpg" class="display-none" id="file" name="file" type="file">
</label>
测试运行良好，直到Chrome 72，但最近更新到Chrome 73和chromedriver 73.0.3683.68后，文件上传无效。 UI中显示错误Upload failed，上传请求（POST）返回状态代码400.仅在运行自动测试时才会发生这种情况。手动上传工作正常。
一个快速的谷歌搜索出现了Chromium issue 792336链接在GitHub issue 3730 - File upload on input, stop working in Chrome 73。
File Inputs: Don't generate change events when 'files' is set
The <input type=file> element generates "change" events when the user
interacts with the control to select files, exposed as the 'files'
property (a FileList). This property can be assigned to by script, and
should not generate a "change" event in such a case. It was
erroneously doing so, so fix it.
我不太确定我理解，但这是否意味着自动文件上传将不再适用于Chrome？或者有没有办法通过Chrome 73中的<input type="file">工作上传文件？
注意：我还尝试使用Robot类使用本机Windows上载窗口上载文件，但文件上载失败并出现相同的错误。
StackTrace（上传步骤后的验证步骤）：
org.openqa.selenium.TimeoutException: Expected condition failed: waiting for visibility of element located by By.xpath: //table[@id='table1']//*[contains(text(), 'license.pdf')] (tried for 8 second(s) with 500 milliseconds interval)
at org.openqa.selenium.support.ui.WebDriverWait.timeoutException(WebDriverWait.java:95)
at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:272)
at pageObjects.BasePage.waitForElementToAppear(BasePage.java:116)
at pageObjects.BasePage.uploadFile(BasePage.java:771)
at stepDefinitions.testStepDefs.enterNameAndUploadLicenseDocument(testStepDefs.java:306)
at ?.I enter the name and upload a license document(file:target/parallel/features/test_scenario001_run001_IT.feature:22)
Caused by: org.openqa.selenium.NoSuchElementException: no such element: Unable to locate element: {"method":"xpath","selector":"//table[@id='table1']//*[contains(text(), 'license.pdf
')]"}
(Session info: chrome=73.0.3683.103)
(Driver info: chromedriver=73.0.3683.68 (47787ec04b6e38e22703e856e101e840b65afe72),platform=Windows NT 10.0.17134 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 0 milliseconds
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/no_such_element.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:17:03'
System info: host: 'host1', ip: '10.21.171.143', os.name: 'Windows 10', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_161'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, acceptSslCerts: false, applicationCacheEnabled: false, browserConnectionEnabled: false, browserName: chrome, chrome: {chromedriverVersion: 73.0.3683.68 (47787ec04b6e3..., userDataDir: C:\Users\user1\AppData\L...}, cssSelectorsEnabled: true, databaseEnabled: false, goog:chromeOptions: {debuggerAddress: localhost:XXXXX}, handlesAlerts: true, hasTouchScreen: false, javascriptEnabled: true, locationContextEnabled: true, mobileEmulationEnabled: false, nativeEvents: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: XP, platformName: XP, proxy: Proxy(), rotatable: false, setWindowRect: true, strictFileInteractability: false, takesHeapSnapshot: true, takesScreenshot: true, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unexpected
AlertBehaviour: ignore, unhandledPromptBehavior: ignore, version: 73.0.3683.103, webStorageEnabled: true}
Session ID: 7de258a01764adc064e8c966xx77017g
*** Element info: {Using=xpath, value=//table[@id='table1']//*[contains(text(), 'license.pdf')]}
at sun.reflect.GeneratedConstructorAccessor12.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:214)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:166)
at org.openqa.selenium.remote.http.JsonHttpResponseCodec.reconstructValue(JsonHttpResponseCodec.java:40)
at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:80)
at org.openqa.selenium.remote.http.AbstractHttpResponseCodec.decode(AbstractHttpResponseCodec.java:44)
at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:323)
at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:428)
at org.openqa.selenium.By$ByXPath.findElement(By.java:353)
at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:315)
at org.openqa.selenium.support.ui.ExpectedConditions$7.apply(ExpectedConditions.java:205)
at org.openqa.selenium.support.ui.ExpectedConditions$7.apply(ExpectedConditions.java:201)
at org.openqa.selenium.support.ui.FluentWait.until(FluentWait.java:249)
at pageObjects.BasePage.waitForElementToAppear(BasePage.java:116)
at pageObjects.BasePage.uploadFile(BasePage.java:771)
at stepDefinitions.testStepDefs.enterNameAndUploadLicenseDocument(testStepDefs.java:306)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at cucumber.runtime.Utils$1.call(Utils.java:26)
at cucumber.runtime.Timeout.timeout(Timeout.java:16)
at cucumber.runtime.Utils.invoke(Utils.java:20)
at cucumber.runtime.java.JavaStepDefinition.execute(JavaStepDefinition.java:57)
at cucumber.runner.PickleStepDefinitionMatch.runStep(PickleStepDefinitionMatch.java:50)
at cucumber.runner.TestStep.executeStep(TestStep.java:65)
at cucumber.runner.TestStep.run(TestStep.java:50)
at cucumber.runner.PickleStepTestStep.run(PickleStepTestStep.java:43)
at cucumber.runner.TestCase.run(TestCase.java:46)
at cucumber.runner.Runner.runPickle(Runner.java:49)
at cucumber.runtime.junit.PickleRunners$NoStepDescriptions.run(PickleRunners.java:146)
at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:68)
at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:23)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:330)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:78)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:328)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:65)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:292)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:305)
at org.junit.runners.ParentRunner.run(ParentRunner.java:412)
at cucumber.runtime.junit.FeatureRunner.run(FeatureRunner.java:73)
at cucumber.api.junit.Cucumber.runChild(Cucumber.java:123)
at cucumber.api.junit.Cucumber.runChild(Cucumber.java:65)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:330)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:78)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:328)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:65)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:292)
at cucumber.api.junit.Cucumber$RunCucumber.evaluate(Cucumber.java:147)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:305)
at org.junit.runners.ParentRunner.run(ParentRunner.java:412)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
Chrome 74今天发布，这不再是一个问题。使用sendKeys（）通过<input type="file">元素上传再次与Chrome 74/ChromeDriver 74.0.3729.6一起工作。