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Jmeter Interface Test practice-data transfer

Testing without correlation between interfaces is meaningless and soulless. Only when data is transferred between different interfaces can important links in business scenarios be delineated.

We use the more general http/https protocol, and the interface generally returns json as an example.

Give an example scenario:

For example, in the e-commerce platform, a token token is generated after the user logs in, and other interfaces take the token to determine whether the user is logged in before the relevant operation can be carried out. When the user adds the goods to the shopping cart to pay, the system generates the order number according to the rules, and all orders and corresponding status are found in the user's all order list.

Analysis of key points:

1. Generate token after logging in via the login API

2. If the pay payment API gets the token correctly, the order number will be generated after the payment is completed.

3. OrderList order list API needs to have token and order number as required entries to find out the status of all orders of the user.

With Idea, let's start!

There are three interfaces on hand to simulate the above scenario, but also for the convenience of demonstration

Login login / / generate token

Create user / / generate user id

Delete the user / / get the create user interface id, and delete the user

Prerequisites:

You need to use Json sampler. Jmeter is not provided by default. You can install it with plugin-manager. You can also go to the jmeter official website to download the jar package and put it in the% jmeter_home%/lib/ext/ directory. Restart jmeter takes effect.

Step 1: create three new sampler in the thread group

Login interface

The input method is json, which is set in the http information management header.

Login with user name and password to get token. User name and password are used as variables, and values are assigned in user-defined variables.

Create a user interface

Json is also used to input parameters

After obtaining the token of the login interface, generate a unique id for the user

Extracting token by regular expression

Why do rules write like this?

Let's take a look at the result tree after the execution of login.

AccessToken is under the data node, because it can find the node accurately.

Combine with beanshell to transfer token

Beanshell We have introduced it many times in previous tweets, which built-in objects and how to define them can be found in the official jmeter documentation.

Let's take a look at the settings in the http Information Manager

So that every interface in the thread group can use token.

All right, let's perform the login and the new user interface, and take a look at the json returned by the new interface, so that we can write the node structure in the json sampler.

Using Json path Tester, check that the new API returns a string of json trees, including the user name we created with a random number and the user id generated by the system. This id is to be passed to the next API to delete the user to use.

How to extract this id? Using json samplers or regular expressions is a good choice. Use json samplers to demonstrate today.

Names of created variables: the variable name that passes this to the next interface to be used

Json path expressions: the field value extracted from json

. Note that there is a point after the dollar sign that cannot be lost. Such a combination indicates the root directory. Data is the root node, and id is under the data node.

Match no:0 is random; n takes the matching value;-1 matches all, and subsequent references take the Nth value with the variable name _ N

Default values: the default value, which is taken when the value does not match

Delete user Interfac

Pass the id in the json sampler to the delete interface, and the whole data transfer chain is set up.

Let's take a look at the directory structure.

Take a look at the execution result-add interface

Result Tree-Delet

Add the id tail number 9984 generated by the system in the new API.

The id= tail number 9984 in the delete interface is passed to the interface as an input parameter. The id of the two interfaces is the same, and the data transmission is correct.

The above steps constitute a whole set of data link transmission process, which makes the interface test closer to the requirements of the business scenario and makes the data more meaningful.

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