Common assertions for JMeter interface testing

In the interface test , We need to check whether the request processing result is correct . When the response status code of the request is 200, Is the function of the time table interface normal ？ It's obviously not true .

The response status is 200, It can only indicate that the service has processed your request , At the same time, the result is returned ; However, it does not mean that the processing result meets the functional requirements of the interface .

There is only further inspection at this time “ The response data ” Whether it is consistent with that in the interface description ; To determine whether the result is correct .

Jmeter Provides an assertion element , The implementation checks whether the response data in the interface test meets the expectation , Ensure that the interface test is consistent with the expectation .

notes ： The content of this article is based on “Jmeter Quickly create interface test scripts ” Request as an example .

1、 Response assertion

Apply to ： Judge the comparison between the returned content and the expected result

step ： Where judgment is needed “HTTP” Request interface , Right click “ add to ”\“ Assertion ”\“ Response assertion ”.

for example , The response text contains “ nanjing ”, Indicates that the request response was successful .

stay “ Test mode ” Add “ nanjing ”, Click on “ start-up ” Icon , Perform the requested , View the result tree . Maybe it's strange to have friends here , How is it consistent with the execution effect without assertion .

Then revise it again “ Response assertion ” by “ Nanjing I love you ”, Execute the request again .

When the request result is a red table, the request execution result is different from the expected setting , Not included “ Nanjing I love you ” character , Prove that the execution of this interface use case failed .

Following pair “ Response assertion ” Introduce the content in detail .

APPly to:

Main sample and sub-samples: It acts on the main sampler and the corresponding sub sampler

Main sample only： Only works on the main sampler

Sub-samples only: Only works on sub samplers

JMeter Variable: Act on jmeter Variable ( Enter... In the input box jmeter The variable name of )

Test fields ： The response text 、 Response code 、 Response information 、 Response head …

Pattern matching rules ： Include 、 matching 、Equals、 character string 、 no 、 perhaps

Test mode : You can add / Delete the content to be judged , Button “ add to ”、“ Delete ” Manage the specified content .

In addition to response assertions , There are other assertions .

2、 Size assertion

Apply to ： Determine the size of the returned content .

step ： Where judgment is needed “HTTP” Request interface , Right click “ add to ”\“ Assertion ”\“ Size assertion ”.

APPly to: Same as “ Response assertion ”

Response Size Field to Test（ Test scope of response field ）: Complete response 、 Response head 、 The message body of the response 、 Response code 、 Response information .

Size to Assert: Assertion byte size

The response field can be seen by viewing the result tree

Set the assertion value according to the size of the returned response message body , Generally, what is larger than how many bytes , Do not use =, Because the data is changing , Most will be within a certain range .

3、 Assertion duration

Apply to ： Determine the response time of the request

step ： Where judgment is needed “HTTP” Request interface , Right click “ add to ”\“ Assertion ”\“ Assertion duration ”.

APPly to: Same as “ Response assertion ”

The duration of the （ millisecond ）： Set the time of the period , For example, predict 3 Second response , It is set to 3000, If the response time is 3 Seconds back to , Then it asserts success , Otherwise failure ！

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