问尝试所有仍面临- system.property org.testng.TestNGException的解决方案后:无法实例化类

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import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.Assert;
import org.testng.annotations.Test;

/**
* Unit test for simple App.
*/
public class AppTest {
/**
* Create the test case
*
* @param testName
* name of the test case
*/


public AppTest(String testName) {
        super();
        System.setProperty("webdriver.chrome.driver", "C:/Users/Dell/Downloads/chromedriver_win32/chromedriver.exe");
}



// public static void main()
// {
//
// }

public WebDriver driver = new ChromeDriver();
String appUrl = "https://google.com";

@Test
public void gmailLogin() {
    // launch the fire fox browser and open the application url
    driver.get(appUrl);
    System.out.println("Suceessfully opened the browser URL");

    // maximize the browser window
    driver.manage().window().maximize();

    // declare and initialize the variable to store the expected title of
    // the web page.
    String expectedTitle = "Sign in - Google Accounts";

    // fetch the title of the web page and save it into a string variable
    String actualTitle = driver.getTitle();
    Assert.assertEquals(expectedTitle, actualTitle);

    // enter a valid user name in the email text box
    WebElement username = driver.findElement(By.id("Email"));
    username.clear();
    username.sendKeys("TestSelenium");

    // enter a valid password in the password text box
    WebElement password = driver.findElement(By.id("Passwd"));
    password.clear();
    password.sendKeys("password123");

    // click on the Sign in button
    WebElement SignInButton = driver.findElement(By.id("signIn"));
    SignInButton.click();

    // close the web browser
    driver.close();
    }

}

[RemoteTestNG] detected TestNG version 6.14.2
org.testng.TestNGException: 
Cannot instantiate class com.selenium.SampleDemo1.AppTest
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:30)
    at org.testng.internal.ClassHelper.createInstance1(ClassHelper.java:423)
    at org.testng.internal.ClassHelper.createInstance(ClassHelper.java:336)
    at org.testng.internal.ClassImpl.getDefaultInstance(ClassImpl.java:125)
    at org.testng.internal.ClassImpl.getInstances(ClassImpl.java:190)
    at org.testng.TestClass.getInstances(TestClass.java:95)
    at org.testng.TestClass.initTestClassesAndInstances(TestClass.java:81)
    at org.testng.TestClass.init(TestClass.java:73)
    at org.testng.TestClass.<init>(TestClass.java:38)
    at org.testng.TestRunner.initMethods(TestRunner.java:389)
    at org.testng.TestRunner.init(TestRunner.java:271)
    at org.testng.TestRunner.init(TestRunner.java:241)
    at org.testng.TestRunner.<init>(TestRunner.java:192)
    at org.testng.remote.support.RemoteTestNG6_12$1.newTestRunner(RemoteTestNG6_12.java:33)
    at org.testng.remote.support.RemoteTestNG6_12$DelegatingTestRunnerFactory.newTestRunner(RemoteTestNG6_12.java:66)
    at org.testng.SuiteRunner$ProxyTestRunnerFactory.newTestRunner(SuiteRunner.java:713)
    at org.testng.SuiteRunner.init(SuiteRunner.java:260)
    at org.testng.TestNG.run(TestNG.java:1017)
    at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.testng.internal.ObjectFactoryImpl.newInstance(ObjectFactoryImpl.java:24)
    ... 25 more
Caused by: java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html