How to write clean integration tests

Question

I want to write an integration test using Go and MySQL. But I confused how to do this clean. I have 4 functions: create, get, update, and delete. Is it a good practice if I just have one test function to test all my code? For example:

func TestCRUD(t *testing.T){
    t.Run("success case", func(t *testing.T){
         // call create func

         // call update func

         // call get func

         // call delete func
    })
}

If I have code like above, I just have one test function to test all my code. If I want to add a test case, I just add to TestCRUD() function. Is it a good practice?

Or should I write test function for each CRUD function? So I have 4 test functions and every test function also have many test cases. How can I write my integration test clean?

Answer 1

If you think in maintainability and clean code, IMHO I would recommend you to test each CRUD functions in a different test.

Regarding your question about multiple test cases I would say that a good approach is to use DDT (data-driven-testing or table-driven-testing). Something like:

func Test_create(t *testing.T) {
    type args struct {
        // Define here your function arguments
        arg1 string,
        arg2 string,
    }
    tests := []struct {
        name string
        args args
        want bool // Your possible function output
    }{
    // TODO: Add test cases.
    }
    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            if got := create(tt.args.id); got != tt.want {
                t.Errorf("create() = %v, want %v", got, tt.want)
            }
        })
    }
}

Using gotests you can generate clean and nice tests for your functions.