Interface test framework practice (II) | interface request assertion

The picture is quoted from Real Python
Interface request assertion means that after the request is initiated , Judge the returned response content , Used to check whether the response content is consistent with the specified return value .
After initiating the request , We use a variable r Store the contents of the response , That is to say Response object .
Response Object has many powerful methods to call , For example, get the response header directly , obtain Unicode The encoded response content , Get binary response content , Get the original response content and so on .
Get the response header
Get the encoded response value ：
You can also use r.raw Get the original response content ,r.content Get binary response content , In addition, the code is JSON The response content of the format , It will be detailed in later chapters .
install JSON library ：
Response status code assertion ：
assert yes Python Built in functions for , Used to determine the expression , When the expression condition is False An exception will be triggered when .
r.status_code yes Response Object , The status code used to get the return value .
assert r.status_code==200 Is to judge whether the status code is equal to 200, If not equal to 200 An exception will be thrown .
Counter example ： Response status code assertion , Determine whether the response status code is 400
As can be seen from the previous example , The response code should be 200, Because with 400 It's not equal , So an exception was thrown .
During the test , The return value of most interfaces is JSON Format . therefore , Master how to JSON The skill of asserting response values , It can more easily improve the interface automation test cases .
r.json() For response values r to JSON code ：
For dictionary format , Can pass dict[“key”] The way to get value value .
For list format , Can pass list[index] Get the corresponding index value value .
stay JSON In the assertion of , The main application is the search method of dictionary and list . If you encounter mixing or nesting , It just needs to be removed layer by layer , Until you find the field that needs to be asserted .
Dictionary format assertion , Judge headers Medium Host by  httpbin.org 1

1. The first layer is key The value is “header” Of value
2. The second level is key The value is “Host” Of value
3. Judge key The value is “Host” Of value Is it worth it “httpbin.org 1” equal
Dictionary mixed list format assertion , Judge hogwarts The first place in the corresponding list is ‘a’

4. The first layer is key The value is ‘form’ Of value
5. The second level is key The value is ‘hogwarts’ Of value
6. The third layer is indexed as 0 Of value
7. Judge that the previous index is 0 Of value Is it equal to “a”
More , We will read it in detail in the following chapters .