Learn java to understand JMeter test plan

Test old trees 2020-11-07 20:37:37
learn java understand jmeter test


The content of this article is to explain the interface of things :

image-20201103171931579

Name

name , The test plan has to have a name .

Comments

notes , Except for the name , And let people know what it does .

User Defined Variables

The test plan is the root node . The root node means that the scope is global .

User defined variables for test plan , It is used to set global variables .

On the interface , It shows a table , There are two columns , The first column is Name, The second column is Value, Corresponding to variable name and variable value respectively .

At the bottom of the table is a row of buttons , Add, delete, modify, check and move the table up and down .

After defining the variables , adopt ${} To use . For example, a variable is defined a The value is 1, adopt ${a} To use .

User defined variables , It's actually defined as a constant .Value Is string , Can't change . For example, we just defined variables a, Redefining variables b The value is ${a} + 1,b The actual value of is "${a} + 1", It doesn't work and it becomes 2.

Run Thread Groups consecutively

Under the test plan , Multiple thread groups can be added , like this :

image-20201104110619688

Are these thread groups sequential or parallel ? This is controlled by the test plan .

If this option is checked , It's sequential execution , After the execution of the previous thread group , Then execute the next thread group .

If I don't check it , It's parallel execution . Parallel execution is not sequential , The result is random .

Run tearDown Thread Groups after shutdown of main threads

When adding a thread group , There's something else 2 Group of threads :

image-20201105135928151

setUP Thread groups are used to initialize before testing ,tearDown Thread groups are used for post test cleanup .

By default, this option is checked , Will execute tearDown Thread group . If it is not checked, it will not be executed .

Funtional Test Mode

It's not what it takes. , Don't talk about it .

Add directory or jar to classpath

At the bottom , You can add jar package or jar Package directory to classpath.

What is? classpath? What is? jar package ?

So , I specially looked for Liao Xuefeng's Java course classpath and jar Look at .

A brief explanation ,Java The source file is .java file , After compilation is .class file .JVM yes Java The actuator of , It can only be carried out .class file . In order to make JVM Find the one you want .class file , Need to put .class File path added to classpath in . For the convenience of management , Will put more than one .class The files are typed into a package , Become a document , That is to say .jar file , be called jar package .

JMeter Yes, it is Java The tools of writing , You can add jar Package to extend functionality .

One entrance is test plan , After all, it's the global node , It's perfect for . Another entry is to add expansion packages , Put it directly into the installation directory lib/ext Under the table of contents . Recommend the latter .

A brief review

This paper deals with JMeter The edit area of the test plan explains . The test plan is the only root node , Suitable for global configuration , For example, global variables , Control how thread groups run , introduce jar package .

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