QAlity

Why Selenium Tests Are Flaky (And How to Fix Them)

Chitrajan Dhiman

21 Apr 2026 • 2 min read

Automation is supposed to make testing reliable. But for many teams, it introduces a new problem: flaky tests. A test passes today and fails tomorrow, without any code changes. This inconsistency wastes time, breaks pipelines, and reduces trust in automation.

In this guide, we’ll look at why Selenium tests become flaky and how to reduce it.

What are flaky tests?

A flaky test is a test that:

Passes sometimes
Fails sometimes
Without any real change in the application

This makes results unreliable and hard to trust.

Why Selenium tests are flaky

Flakiness usually comes from a few common issues.

1. Timing issues

Selenium interacts with elements before they are ready.

// Fails if element not ready
driver.findElement(By.id("login")).click();

Better approach:

WebDriverWait wait = new WebDriverWait(driver, Duration.ofSeconds(10));
wait.until(ExpectedConditions.elementToBeClickable(By.id("login"))).click();

2. Dynamic UI changes

Modern apps frequently update:

Elements re-render
IDs change
DOM structure evolves

Locators that worked earlier may stop working.

3. Environment differences

Tests behave differently based on:

Network speed
Server response
Local vs CI environment

Same test, different result.

4. Weak locators

Using fragile selectors like:

Long XPath chains
Auto-generated IDs

makes tests easy to break.

5. Test data dependency

Tests relying on shared or changing data often fail unpredictably.

6. Parallel execution issues

Parallel runs can cause:

Race conditions
Data conflicts

leading to inconsistent failures.

Common causes and impact

Cause	Impact
Timing issues	Random failures
Dynamic UI	Broken locators
Environment variability	Inconsistent results
Weak selectors	Fragile tests

How to reduce flakiness

Focus on a few practical improvements.

1. Use explicit waits

Wait for conditions instead of using fixed delays.

2. Improve locators

Use stable attributes like:

id
name
data-test-id

3. Control test data

Make tests independent and predictable.

4. Stabilize environments

Keep environments consistent and reduce variability.

5. Limit UI-heavy tests

Focus UI automation on critical flows.

Why this keeps coming back

Even after fixes, flakiness returns.

Because tests depend heavily on:

UI structure
timing
environment

As systems grow, maintaining stability becomes harder.

A better direction

Teams are moving toward approaches that:

Reduce dependency on fragile locators
Handle UI changes more intelligently
Require less manual maintenance

How QAlity helps

QAlity improves reliability by:

Using smarter element detection
Reducing manual scripting effort
Running tests in controlled environments

This helps reduce flaky test issues over time.

Conclusion

Flaky Selenium tests are a common challenge as automation scales. While better waits, locators, and environments help, they don’t fully solve the problem.

As systems grow, teams need more reliable and low-maintenance approaches to automation.