How to set up hermitic tests in julia with per test and or per fixture setup te

When writing tests in Julia, it is important to ensure that each test is isolated and does not interfere with other tests. This can be achieved by setting up hermetic tests, where each test has its own setup and teardown procedures. In this article, we will explore three different ways to set up hermetic tests in Julia.

Option 1: Using the `@testset` macro

The `@testset` macro in Julia allows you to group multiple tests together and define setup and teardown procedures for the entire test set. Here’s an example:

@testset "My Test Set" begin
    setup_func()
    
    @test 1 + 1 == 2
    
    teardown_func()
end

In this example, the `setup_func()` function is called before running any tests in the test set, and the `teardown_func()` function is called after all the tests are executed. This ensures that each test in the test set has the same setup and teardown procedures.

Option 2: Using the `@before` and `@after` macros

If you want to set up and tear down procedures for each individual test, you can use the `@before` and `@after` macros in Julia. Here’s an example:

@test "My Test" begin
    @before setup_func()
    
    @test 1 + 1 == 2
    
    @after teardown_func()
end

In this example, the `setup_func()` function is called before running the test, and the `teardown_func()` function is called after the test is executed. This ensures that each test has its own setup and teardown procedures.

Option 3: Using a testing framework

If you are working on a larger project with multiple tests, it might be beneficial to use a testing framework like JuliaUnit or Test.jl. These frameworks provide more advanced features for setting up hermetic tests, such as fixtures and setup/teardown hooks. Here’s an example using JuliaUnit:

using JuliaUnit

@testset "My Test Set" begin
    @before_each setup_func()
    
    @test 1 + 1 == 2
    
    @after_each teardown_func()
end

In this example, the `setup_func()` function is called before each test, and the `teardown_func()` function is called after each test. This ensures that each test has its own setup and teardown procedures, similar to Option 2, but with the added benefits of a testing framework.

After exploring these three options, it is clear that using a testing framework like JuliaUnit or Test.jl provides the most flexibility and advanced features for setting up hermetic tests. These frameworks allow you to define fixtures, setup/teardown hooks, and more, making it easier to write and maintain tests in Julia. Therefore, Option 3 is the better choice for setting up hermetic tests in Julia.