1. SELF-HEALING TEST
AUTOMATION 2.0
THE FUTURE
• Problem statement
• How sha works
• Demo
• TAF integration
• POS results
• Future plans

2. ANNA CHERNYSHOVA
Lead Software Test Automation Engineer
Testing Competency Center Expert
Email: anna_chernyshova@epam.com
FB: anna.chernyshova.79

3. PROBLEMS
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
PROBLEM STATEMENT

4. PROBLEMS GOALS FEATURES
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
Improve E2E automated test stability
PROBLEM STATEMENT

5. PROBLEMS GOALS FEATURES
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
Improve E2E automated test stability
Reduce amount of test cases failed due to
non-product issue
PROBLEM STATEMENT

6. PROBLEMS GOALS FEATURES
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
Improve E2E automated test stability
Reduce amount of test cases failed due to
non-product issue
Reduces Tests Maintenance efforts
PROBLEM STATEMENT

7. PROBLEMS GOALS FEATURES
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
Improve E2E automated test stability
Reduce amount of test cases failed due to
non-product issue
Reduces Tests Maintenance efforts
More time to cover new functionality with
tests
PROBLEM STATEMENT

8. PROBLEMS GOALS FEATURES
Unstable automated E2E tests inhibit CI
~40% team effort spent to fix automations
issues, rather than test product and add new
tests
Web application updates constantly every
sprint, which leads to locator change
Improve E2E automated test stability
Reduce amount of test cases failed due to
non-product issue
Reduces Tests Maintenance efforts
More time to cover new functionality with
tests
Shipping better products faster
PROBLEM STATEMENT

9. What we
have on the
market

10. Dynamic
locators

11. PROS & CONS
• Dynamic DOM state updates
• Easy to write and support tests
• Tests are stable
• Cross-browser, CI, Jira integrations from the box
• Only for new projects
• Strong dependency from tool ecosystem
• May be not secured
• May lose tests when project finished

12. Epam Self-healing
Applicable at any stage of project development
Minimal dependency from the TAF
Replace static locators with dynamic ones

13. Self-healing
library…
Gives ability to find controls (new locator) for updated
WEB pages
Use kinda ML algorithms for Web page changes
identification
Is a standalone Java jar connected to test cases code
base
Helps >2x times reduced test fails because of updated
UI
Provides Html report which handles locators analysis
Provides Intellij Idea plugin to make code updates with
new locator values

14. HOW SHA WORKS

15. LCS ALGORITHM
Longest common subsequence
problem of finding the longest subsequence common to all sequences in a set of sequences
*widely used by revision control systems such as Git

16. LCS ALGORITHM MODIFICATION
Longest common subsequence with weight
Added extra weight for tag, Id, class, value, other attributes
<button id=btn-1>
<button id=btn-1>

17. Self-healing selenium (jar)
Tree-comparing(jar)
Includes Tree-comparing dependency
Implements Selenium WebDriver
Overwrites findElement() method
Catch NoSuchElementException
Activates LCS algorithm in Tree-comparing library
Save reference element path to storage
Get reference element path from storage
Get current DOM state
Search in current state for the best subsequence
Generate new CSS locator
JAR LIBRARIES

18. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Test Automation Framework
Element Found

19. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Test Automation Framework
Element Found
Save successful path
Old locator

20. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Element Not Found
Test Automation Framework

21. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Element Not Found
Test Automation Framework
Old locator
Successful path
Page state

22. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Element Not Found
Test Automation Framework
Old locator New locator
Successful path
Page state
New locator

23. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Element Not Found
Test Automation Framework
Old locator New locator
Successful path
Page state
New locator
Find New Element

24. Self-healing selenium (jar) Tree-comparing(jar)
Reference elements path
storage
Test
Driver.findElement(PageAwareBy(…))
Web Page
Target
element
Find Element
Element Not Found
Test Automation Framework
Element Found
Save successful path
Old locator New locator
Successful path
Page state
New locator
Find New Element

26. SelfHealingDriver
findElement
public WebElement findElement(By by) {
if (by instanceof PageAwareBy) {
try {
Trying to find the element and save its path if success
} catch (NoSuchElementException var5) {
Find previous reference element path in storage
Generate new best matches locator
return healedLocator;
}
} else {
return delegate.findElement(by);
}
}

27. PageAwareBy
extends By
PageAwareBy(String pageName, By by, SelfHealingEngine
engine) {
this.pageName = pageName;
this.by = by;
this.engine = engine;
} PageObject Page
Locator
New locator processor

28. Functions supported
• By() -> PageAwareBy()
• @FindBy -> @PageAwareFindBy
• WebDriver -> SelfHealingDriver
• Iframe support
• Actions support
• Remote test run
• Parallel test run
• Works with Selenium wrappers like Selenide

29. Html report

30. Intellij Idea plugin to make code updates
HTML REPORT

31. Intellij Idea plugin to make code updates
PLUGIN
HTML REPORT
Update
request
{
filename: MainPageWithFindBy
lineNumber: 49
failedLocatorValue://input[@name='EMAIL’]
healedLocatorValue: input.t186__input.js-tilda-rule.t-input
}

32. Intellij Idea plugin to make code updates
TAF CODE BASE
PLUGIN
HTML REPORT
Find locator and update
Update
request
{
filename: MainPageWithFindBy
lineNumber: 49
failedLocatorValue://input[@name='EMAIL’]
healedLocatorValue: input.t186__input.js-tilda-rule.t-input
}

33. TAF INTEGRATION

34. 1. Declare custom EngineConfig with the path to store new locators. For example 'shaselenium'
EngineConfig engineConfig = EngineConfig
.custom()
.setStorage(new FileSystemPathStorage(Paths.get("sha", "selenium")))
.build();
2. Init driver instance of SelfHealingDriver
SelfHealingDriver driver = new SelfHealingDriver(new ChromeDriver(), engineConfig);
3. Locate elements
By buttonBy = PageAwareBy.by("MainPage", By.id(testButtonId));
Or
@PageAwareFindBy(page="MainPage", findBy = @FindBy(id = "markup-generation-button"))
WebElement buttonBy;
4. Interact with elements as usual
driver.findElement(buttonBy).click();
Important! Do not delete data from the folder where files with new
locators are stored. They are used to perform self-healing in next
automation runs
Important! "MainPage" is the name of the page to which the
WebElement belongs

35. RESULTS

36. Projects for pilot
TAF based on Java +
Selenium
(WebDriver)
Continuous UI
updates
UI generated by CMS

37. Projects for pilot
TAF based on Java +
Selenium
(WebDriver)
Continuous UI
updates
UI generated by CMS
>20 replies
6 Web projects for
pilot
3 projects are still
in focus

38. 100% tests healed
Healed localization testing

39. Issues
Test execution time
increase
Can’t heal single element
from the list
Probability of
false/positive results
Code not updated after
healing

40. FUTURE PLANS

41. Future plans
Idea plugin Mobile support

42. Idea Plugin
✅ @PageAwareFindBy
❌ PageAwareBy(..)
❌ Local declaring

43. Thanks to
Oleh Khailenko
Lead Software Engineer
Kostiantyn Morozkin
Senior Software Engineer
Nikolai Kobzev
Senior Software Engineer
Vladimir Moshkin
SoftwareTest Automation Engineer

44. Email: anna_chernyshova@epam.com
FB: anna.chernyshova.79