Selenium self-healing

How to self-heal Selenium locators

testRigor has a library for Selenium Java TestNG/JUnit that would automatically heal the locators in selenium.

Let’s consider two versions of the application under test. The first one and the second one.

As you can see, they work identically. However, the rendering of the “Update Message” button changed from

to

How to use it

It works by wrapping the Selenium Driver with self-healing testRigor library like this:
SelfHealingDriver driver = TestRigor.selfHeal(new ChromeDriver(), "a2518f3a-3e8b-484a-befe-23b9160ef166");
here is the full example:
package com.yourcompany;

import static org.assertj.core.api.Assertions.assertThat;

import com.testrigor.selfhealingselenium.SelfHealingDriver;
import com.testrigor.selfhealingselenium.TestRigor;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.Test;

@Test
public class SelfHealingIT {
	private static final int SECONDS_TIMEOUT = 4;
	private static final String TEST_TEXT = "test123";

	public void test_Selenium_tests_heals_for_path_and_tag_change() {
		System.setProperty("webdriver.chrome.driver", "/usr/local/bin/chromedriver");
		//RemoteWebDriver driver = new ChromeDriver();
		SelfHealingDriver driver = TestRigor.selfHeal(new ChromeDriver(), "a2518f3a-3e8b-484a-befe-23b9160ef166");
		driver.manage().timeouts().implicitlyWait(SECONDS_TIMEOUT, TimeUnit.SECONDS);
		driver.get("http://r4d4.info/form-button-label");
		actualTest(driver);
		driver.get("http://r4d4.info/form-button-label2");
		actualTest(driver);
	}

	private void actualTest(RemoteWebDriver driver) {
		WebElement input = driver.findElementById("messageNew");
		WebElement button = driver.findElementById("changer");
		input.sendKeys(TEST_TEXT);
		button.click();
		WebElement result = driver.findElementByXPath("/html/body/div/p[1]");
		String text = result.getText();
		assertThat(text).contains(TEST_TEXT);
	}
}

In this example above, it will auto-heal the changer id, which is changed in the next version of the page.

How does it work?

It works in 2 stages:
  1. When your test is executed successfully, testRigor will get your locators and pages on which these locators were used and will infer user intent for each locator. For instance, in the example above, it will record and store user-level intent click "Update Message" as the intent behind the click.
  2. When locator finding will fail in your code, it will use stored user-level intent and the page to find the new locator for the intended element. If found, it will use the new one. If not found – it will fail.

Would it lead to false positives?

Not at all. Since testRigor will infer the user-level intent, your test will succeed when and only when the intended action is possible from end-user’s perspective. For example, when testRigor can find the button with the same name (if there was only one button with this name previously). If the button is renamed AND your code won’t be able to find it by locator – testRigor will fail to avoid the false-positives.

You can think as if testRigor converts your tests into manual tests and if the test can’t be executed manually successfully – testRigor will fail.

Save your time on test maintenance

You can save time on two things in test maintenance with testRigor Selenium Plugin:
  1. Investigation of why the test failed. It will log out the end-user-level steps as you go through the test.
  2. Figuring out what is the new locator to replace the one that no longer works.
Here is the video illustrating how it works:

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