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You can also choose whether the strings will be expected to match the entire response, or if the response is only expected to contain the pattern. You can attach multiple assertions to any controller for additional flexibility.

What is Assertion Results

The Assertion Results visualizer shows the Label of each sample taken. It also reports failures of any Assertions that are part of the test plan.

Note – Assertion Results MUST NOT BE USED during load test as it consumes a lot of resources (memory and CPU). Use it only for either functional testing or during Test Plan debugging and Validation.

Create a Test Plan in JMeter by following below mentioned steps
Step 1 –  Add Thread Group

Select Test Plan on the tree

Add Thread Group                           

To add Thread Group: Right click on the “Test Plan” and add a new thread group: Add -> Threads (Users) -> Thread Group

In the Thread Group control panel, enter Thread Properties as follows: 

Number of Threads: 1 – Number of users connects to the target website
Loop Count: 1 – Number of time to execute testing
Ramp-Up Period: 1 

Step 2 –  Adding JMeter elements  

The JMeter element used here is HTTP Request Sampler. In HTTP Request Control Panel, the Path field indicates which URL request you want to send

Add HTTP Request Sampler

               To add: Right-click on Thread Group and select: Add -> Sampler -> HTTP Request

Below mentioned are the values used in HTTP Request to perform the test

Name – HTTP Request 
Server Name or IP – localhost
Port – 8000
Method – GET
Path – /example

Step 3 – Add Assertions

Add Response Assertion

The response assertion control panel lets you add pattern strings to be compared against various fields of the request or response.

       To add: Right-click on HTTP Request and select: Add -> Assertions-> Response Assertions

Here, I have selected below options:-

Apply to : Main Sample only
Field to Test: Text Response
Pattern Matching Rules: Contains
Pattern To Test: Linda

Step 4 – Add Listeners
Add Assertion Results

The Assertion Results visualizer shows the Label of each sample taken. It also reports failures of any Assertions that are part of the test plan.

              To add: Right-click on Thread Group and select: Add -> Listener-> Assertion Results

View Result Tree 

View Result Tree show results of the user request in basic HTML format

         To add: Right click Test Plan, Add -> Listener -> View Result Tree

Step 5 – Save the Test Plan

           To Save: Click File Select -> Save Test Plan as ->Give name of the Test Plan. It will be saved as .jmx format

Step 6  – Run the Test Plan

Click on Green Triangle as shown at the top to run the test

Step 7 – View the Execution Status in Assertion Results

Click on Assertion Results to see the status of Run. Successful request will like shown below

If the test fails, we will see message mentioning the error in the Assertion Results 

Step 8  – View the Execution Status in View Result Tree

  Click on View Result Tree to see the status of Run. Successful request will like shown below

View Result Tree with failed request looks like below