CartSure JMeter Assertions & Response Validation

You are working as a Performance Tester on the CartSure Project.

Your manager has assigned you to add JMeter Assertions and verify the Response Content, Response Time, and Response Size. Use Response Assertion, Duration Assertion, and Size Assertion, then execute and analyze the results.

Save the completed project as CartSure_Assertion_Test.jmx.

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Understand Response Assertion

What is Response Assertion?

A Response Assertion is a JMeter component used to verify whether the response received from the application contains the expected content.

For example, CartSure may return:

CartSure

A Response Assertion can verify whether the response contains:

iPhone

If the expected content is found, the assertion passes.

If the expected content is not found, the assertion fails.

Add Response Assertion

In the existing JMeter project:

1. Right-click CartSure Request.

2. Select Add.

3. Select Assertions.

4. Select Response Assertion.

5. Rename the assertion to:

CartSure Response Assertion

Configure Response Assertion

Click CartSure Response Assertion.

In the assertion configuration, enter:

CartSure

This will instruct JMeter to check whether the expected text is present in the response.

Execute the Test

Run the JMeter test.

Open the existing View Results Tree listener.

Check the response and assertion result.

If the response contains the expected text:

Response Assertion → PASS

If the expected text is not present:

Response Assertion → FAIL

Understand Duration Assertion

What is Duration Assertion?

A Duration Assertion is a JMeter component used to verify that a request is completed within a specified maximum response time.

For example, if the performance requirement states that a CartSure request should complete within 5 seconds, a Duration Assertion can validate this requirement.

Add Duration Assertion

Right-click CartSure Request.

Select:

Add → Assertions → Duration Assertion

Rename the assertion to:

CartSure Response Time Assertion

Configure Duration Assertion

Click CartSure Response Time Assertion.

Set:

Duration in milliseconds: 5000

This means the response must be completed within 5,000 milliseconds (5 seconds).

Execute the Test

Run the JMeter test again.

Open View Results Tree and check the result.

If the response is received within 5 seconds:

Duration Assertion → PASS

If the response takes more than 5 seconds:

Duration Assertion → FAIL

Understand Size Assertion

What is Size Assertion?

A Size Assertion is a JMeter component used to verify whether the response received from the application meets a specified size requirement.

For example, if a response is unexpectedly small, it could indicate that the application returned incomplete or unexpected data

Add Size Assertion

Right-click CartSure Request.

Select:

Add → Assertions → Size Assertion

Rename the assertion to:

CartSure Response Size Assertion

Configure Size Assertion

Click CartSure Response Size Assertion.

Set:

Size in bytes: less than 4000

Configure the assertion to verify that the response is at least the specified size.

Execute the Test

Run the JMeter test again.

Open View Results Tree and check the result.

If the response meets the configured size requirement:

Size Assertion → PASS

If the response does not meet the requirement:

Size Assertion → FAIL

Understand Assertion Result Analysis

What is Assertion Result Analysis?

Assertion result analysis is the process of reviewing whether the configured validation conditions have passed or failed during test execution.

The three assertions validate:

Response Assertion

       ↓

Response Content

     ↓

Duration Assertion

       ↓

Response Time

     ↓

Size Assertion

       ↓

Response Size

Together, they help determine whether the CartSure response meets the defined validation requirements.

Review the Final Results

Open View Results Tree and review the results after all three assertions have been added.

A successful validation may look like:

Response Assertion        PASS

Duration Assertion        PASS

Size Assertion            PASS

If an assertion fails, identify which validation requirement was not satisfied.

For example:

Response Assertion        PASS

Duration Assertion        FAIL

Size Assertion            PASS

This means the response content and size were acceptable, but the response exceeded the defined response-time limit.

Verify the Final JMeter Structure

Your final JMeter structure should look like:

CartSure Performance Test

       |

       +-- CartSure Users

       |      |

       |      +-- CartSure Request

       |             |

       |             +-- CartSure Response Assertion

       |             |

       |             +-- CartSure Response Time Assertion

       |             |

       |             +-- CartSure Response Size Assertion

       |

       +-- View Results Tree

Save the JMeter Project

From the top menu, select:

File → Save Test Plan As...

In the File Name field, enter:

CartSure_Assertion_Test.jmx

Click Save.

Go to the selected folder and verify that the following file has been created succesfully.

Good Job!!

In this lab, you learned JMeter Assertions, Response Assertion, Duration Assertion, and Size Assertion for response validation.

You also practiced Configuring Assertions, Executing JMeter Tests, and analyzing PASS/FAIL Results to validate application responses and save the .jmx Project.

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