Response assertion of JMeter interface test

One 、 What is the assertion

1. The function of assertion
Assertions are used to execute Examination of results , And process after each sampler in the same range . If you want to assert a sampler , Simply add assertions to a subset of the sampler .

2. Why use assertions ？
JMeter as well as Postman And other interface testing tools , They all work on the basis of agreements , Use these tools to send requests , When the request is sent successfully （ That is, the protocol is sent successfully ）, Request the sample to display green in the view result tree . For example, the agreement status code is 200 It's success , It only means that the protocol is sent successfully , But business is not necessarily successful . It is possible that the protocol was successfully sent , But the business did not succeed , however JMeter Default no judgment . So want to Verify whether the business succeeds or fails , You have to assert , The assertion is based on the response of the interface , Generally, it mainly asserts business status codes and messege Etc .

Two 、 How to judge JMeter Response assertion succeeded ？

3. Take a chestnut
JMeter Assert success , stay View the result tree The request in is green , I can't see the information of asserting success .
JMeter When the assertion fails , It is displayed in red in the view result tree , You can see the information of assertion failure .
Response assertion settings

3、 ... and 、 Jmeter The explanation of the assertion page

4. Apply to
Assertions can be applied to the main sample , Subsample or both . The default assertion is the second , Assertions apply to the main sample .
① Main sample and sub-samples： Master sample and subsample
② Main sample only： Master sample only , Be careful ： Usually, only one request is triggered when a request is issued , So check “main sampie only” Can ; If you send a request, you can trigger multiple server requests , There is main sample and sub-sample It's too late
③ Sub-samples only： Subsamples only
④ JMeter Variable Name to use：JMeter Use variable names , Assertions will be applied to the contents of named variables
Instructions ：
In general , Use the master sample directly （ Default ） The assertion of . Because most of the time , Only the main request will have the necessary assertion data , But the front end JavaScript Language , There are two frames ajax and jquery A single request can generate multiple sub requests internally , And each request will have response data , So , Most of the time , Asserting the main sampler is sufficient .

If you choose Main sample and sub-samples, Then the assertion is to verify the response of the main sampler and the sub sampler , Take a look at the results , Except that the response of the main sampler contains “ Log out ”, The response of other sub samplers did not “ Log out ”, So it will assert failure , The others are the same .
So let's talk about that JMeter Variable Name to use：JMeter Use variable names , Assertions will be applied to the contents of named variables . I tried , It can be used in this way , If there is something wrong, please ask .
The assertion is correct , If the variable name in the regular is inconsistent with the variable name in the assertion , Assertions fail .
5. Response fields to test
① General http Respond to , Check all “ The response text ”
②url The sample is right sample Of url To assert that , If the request is not redirected , Just ask for url, If there is a redirection , Just ask for url Redirection url
③ Response code ：http Response code , Such as 101,200,302,404,501 When we want to verify 404,501 etc. http Response code , You need to check “ ignore status” Because when http The response code is 400,500 when ,jmeter By default, this request fails
④ Response information ： Response information corresponding to the response code , for example “OK"

6. Pattern matching rules (Pattern Mactching Rules)
① Include ： The returned result includes the specified content , Support regular matching
Take a chestnut ：
The response of the interface is

To assert that , Assertion passed
② matching ： And Equals Almost the same as , All assertions must be completely consistent with the return value . The difference is , Regular is supported here , When writing regular expressions , Regular expressions should also match the return value exactly , To be able to pass
③Equals（ equal ）: The returned result is completely consistent with the assertion you specified , Regular matching is not supported . Attention is exactly the same , There is only one special case that will be used , Rarely used
④SubString（ character string ）： And “ Include ” The function is similar to , The difference is , Regular matching is not supported
⑤ no ： conversely , Not It means
⑥ perhaps ： Can be multiple values , Available below , For example, there may be two different judgment values in an assertion , You can choose to use , When a requirement is met , Even if it succeeds . This function can be used in many ways , Like the example above , More assertions
7. Test mode
Enter the value to match （ You can't have Spaces ）

8. Custom failure message (Custom failure message)
When it is judged that the return value is wrong , What information is returned . It can be displayed in the assertion result
You can see the information of the assertion just filled in in the view result tree , Does not match the entered expectations , It is judged that the task failed , View the result tree and mark the task result in red