Applies to ReadyAPI 3.4, last modified on October 21, 2020

Assertions are validation rules applied to test results that check how your target web service performs. In ReadyAPI Test tests, you use assertions to verify response codes, response headers, individual values in response bodies, request execution time and to do other checks. The test runner runs assertions after a test step (request) is over.

Example 1 – SLA Assertion

Let’s create an assertion that will check if the tested web service responds within a predefined time limit:

  1. In ReadyAPI Test, select GET Request in the Navigator panel and click Add Assertion:

    Validating results of functional web service tests: Select a request

    Click the image to enlarge it.

  2. In the dialog, select the SLA category on the left and then Response SLA on the right, and click Add:

    Validating results of functional web service tests: The Add Assertion dialog

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    Note: SLA stands for service-level agreement. This term typically means the maximum time it takes for an operation to execution. Of course, this time should be acceptable for users.
  3. After you click Add in the Add Assertion dialog, ReadyAPI displays the dialog box where you can configure assertion parameters. This dialog box looks differently for different assertions. The image below shows how it looks for the Response SLA assertion.

    Let’s use 1000 milliseconds as the maximum allowed response time for our request. Enter 1000 and click OK:

    Validating results of functional web service tests: Set assertion parameters

    Now, if the request takes longer than the specified number of milliseconds to complete, the assertion will trigger, and the test will fail. If the execution time is less than or equal to the specified value, the check will pass.

The new assertion is avalable in the Assertions panel:

Validating results of functional web service tests: Added assertion

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If the request editor has response data, the assertion will be applied immediately. This is what we have in our case – we ran the request earlier and have some response by now:

Assertions in functional web service tests

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ReadyAPI will re-apply assertion every time it gets fresher response data.

As you can see, in our case, the assertion failed because the request executed for longer time than 1 second. To change the time limit, double-click the assertion in the Assertions page and enter a larger value in the subsequent dialog:

Change assertion properties

Tip: You can add Response SLA and some other assertions to requests by using the New Functional Test wizard.

Example 2 – Check Response Contents

Now let’s see how you can verify response data. The sample response body has the JSON data format, so we will create an assertion for JSON data:

  1. Make sure the request has a response. If it doesn't, click to send a request and get a response. See Run individual requests.

  2. On the Assertions panel, click Add to create another assertion.

    In the subsequent dialog, select the Property Content category on the left and the JsonPath Match assertion on the right and click Add:

    Functional testing of web services: Create an assertion

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    This will invoke the assertion properties dialog.

  3. In the dialog, you need to enter a JSONPath expression that will extract some field from the response body and the expected value of this field:

    Proeprties of an assertion that verifies JSON responses

    You can either type the desired expression, or click Select node on the toolbar and pick a value visually in the subsequent dialog. Let’s do this. Click , select the name field of the first array item in the following dialog and click OK:

    Functional testing of web services: Select a value from a JSON response

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    The JSONPath Expression field now contains the selector, and Expected Result contains the value extracted from the current response data:

    Functional testing of web services: JSONPath expression
  4. Click Save to store the changes.

    Since we have response data, the assertion will be applied immediately and you will see its results in the Assertions page:

    Assertion results

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    Now, if the response changes, the assertion will trigger and the test step will fail.

We would like to note once again that the described Select node command works only if the editor has some response data. That is, you need to run the request first and receive a response. In our case, it works because we ran the request on the previous step of the tutorial.

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See Also

Creating Your First Functional Test
Verifying Results

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