Test result trends in Jenkins - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the 'Test Result Trends' graph in Jenkins show?

It shows how the number of passed, failed, and skipped tests changes over time across builds.

beginner

How does Jenkins collect data for test result trends?

Jenkins collects test results from test reports generated by build steps and stores them to display trends.

beginner

Why is monitoring test result trends important?

It helps detect if tests are becoming unstable or if new failures appear, so teams can fix issues early.

intermediate

Which Jenkins plugin is commonly used to visualize test result trends?

The 'JUnit' plugin is commonly used to publish test results and show trends in Jenkins.

intermediate

What happens if a build has no test reports in Jenkins regarding test result trends?

The test result trend graph will not update for that build, possibly showing gaps or no data for that build.

What does a rising number of failed tests in Jenkins test result trends usually indicate?

A Tests are running faster

B New bugs or issues introduced in the code

C Builds are skipping tests

D Test reports are missing

A rising number of failed tests usually means new problems appeared in the code that cause tests to fail.

Which plugin must be configured to publish test results for trends in Jenkins?

A JUnit plugin

B Git plugin

C Docker plugin

D Slack plugin

The JUnit plugin is used to publish test results and enable test result trends visualization.

If test result trends show a flat line with no changes, what might that mean?

A Builds are failing to start

B Tests are not running at all

C Test results are consistent across builds

D Test reports are corrupted

A flat line means the number of passed, failed, and skipped tests stays the same, showing consistent test results.

What is the best action if test result trends show increasing flaky tests?

A Investigate and fix unstable tests

B Ignore the trend

C Delete old test reports

D Increase build timeout

Flaky tests cause unreliable results; fixing them improves test stability and confidence.

Where in Jenkins can you find the test result trends graph?

A In the system configuration

B In the Jenkins logs

C In the build executor status

D On the project’s main page under 'Test Result Trend'

The test result trend graph is shown on the project’s main page if test results are published.

Explain how Jenkins uses test result trends to help improve software quality.

Think about how seeing test results change helps teams act faster.

Describe the steps to enable test result trends in a Jenkins project.

Focus on what Jenkins needs to collect and show test trends.

Practice

1. What is the main purpose of test result trends in Jenkins?

easy

A. To show how test results change over time

B. To run tests faster

C. To deploy applications automatically

D. To create new test cases

Solution

1. Step 1: Understand test result trends concept

   Test result trends track test outcomes across multiple builds to see progress or issues.

2. Step 2: Identify the main purpose

   The main goal is to observe changes in test results over time, helping catch problems early.

3. Final Answer:

   To show how test results change over time -> Option A

4. Quick Check:

   Test result trends = show changes over time [OK]

Hint: Trends track test results over builds, not speed or deployment [OK]

Common Mistakes:

• Confusing trends with deployment automation
• Thinking trends create tests
• Assuming trends speed up tests

2. Which Jenkins plugin is required to publish test result trends from JUnit XML reports?

easy

A. Git plugin

B. Docker plugin

C. Pipeline plugin

D. JUnit plugin

Solution

1. Step 1: Identify plugin for JUnit XML reports

   JUnit plugin in Jenkins processes JUnit XML test reports and generates test result trends.

2. Step 2: Confirm plugin role

   Only the JUnit plugin handles test result publishing and trend visualization from JUnit reports.

3. Final Answer:

   JUnit plugin -> Option D

4. Quick Check:

   JUnit plugin publishes test trends [OK]

Hint: JUnit plugin handles JUnit XML test reports and trends [OK]

Common Mistakes:

• Choosing Git plugin which manages source code
• Selecting Docker plugin unrelated to tests
• Confusing Pipeline plugin with test reporting

3. Given this Jenkins pipeline snippet, what will happen if the junit '**/test-results.xml' step is missing?

pipeline {
  agent any
  stages {
    stage('Test') {
      steps {
        sh 'run-tests.sh'
        junit '**/test-results.xml'
      }
    }
  }
}

medium

A. Test results will be published and trends shown

B. No test results will be published, no trends available

C. Pipeline will fail with syntax error

D. Tests will not run at all

Solution

1. Step 1: Understand the role of junit step

   The junit step publishes test results from XML files and enables trend graphs.

2. Step 2: Analyze missing junit step effect

   Without junit, test results are not published, so no trends appear, but tests still run.

3. Final Answer:

   No test results will be published, no trends available -> Option B

4. Quick Check:

   Missing junit step = no published results [OK]

Hint: Without junit step, no test results or trends appear [OK]

Common Mistakes:

• Thinking pipeline fails without junit step
• Assuming tests won't run without junit
• Believing trends show without publishing results

4. You added the junit '**/results.xml' step but Jenkins shows no test trends. What is the most likely cause?

medium

A. The XML file path pattern is incorrect or no files match

B. The Jenkins server is offline

C. The pipeline syntax is invalid

D. The tests did not run

Solution

1. Step 1: Check file path pattern for test reports

   If the pattern **/results.xml does not match any files, no results are published.

2. Step 2: Confirm Jenkins behavior on missing files

   Jenkins silently skips publishing if no matching files found, so no trends appear.

3. Final Answer:

   The XML file path pattern is incorrect or no files match -> Option A

4. Quick Check:

   Wrong file path = no test trends [OK]

Hint: Verify XML file path matches actual test report location [OK]

Common Mistakes:

• Assuming Jenkins is offline without checking
• Blaming pipeline syntax without error
• Thinking tests must fail to hide trends

5. You want to track test result trends for multiple test suites in Jenkins, each producing separate JUnit XML files in different folders. How should you configure the junit step to show combined trends?

hard

A. Manually merge XML files before publishing

B. Use multiple junit steps, one per folder

C. Use a single junit step with a combined glob pattern like '**/test-results/*.xml'

D. Publish only one folder's results to avoid confusion

Solution

1. Step 1: Understand how junit step handles multiple files

   The junit step accepts glob patterns to include multiple XML files from different folders.

2. Step 2: Choose best practice for combined trends

   Using a single junit step with a combined pattern like '**/test-results/*.xml' publishes all results together, enabling combined trends.

3. Final Answer:

   Use a single junit step with a combined glob pattern like '**/test-results/*.xml' -> Option C

4. Quick Check:

   Single junit step + combined pattern = combined trends [OK]

Hint: Use one junit step with glob pattern to include all XML files [OK]

Common Mistakes:

• Using multiple junit steps causing separate trends
• Trying to merge XML files manually
• Ignoring some test suites results