How to use Golang functions for web application testing

The steps for function testing in Go include: creating test files and importing relevant packages. Define a test function including different input/expectation combinations to test. Call the function and verify that the results are as expected. Run tests to verify the correctness of the function.

How to use functions in Go for web application testing

Function testing is to verify whether the specified function in the web application is correct An efficient way to work. In Go, we can easily perform function testing using the standard testing package.

Practical Case

Consider the following Go function, which calculates the sum of two numbers:

package mypackage

func Sum(a, b int) int {
    return a + b
}

To write a function test for this function, we can Use the following steps:

1. Create a new file sum_test.go and add the following imports:

import (
    "testing"
    "mypackage"
)

2. Define a test function:

func TestSum(t *testing.T) {
    type input struct {
        a int
        b int
    }
    tests := []struct {
        input    input
        expected int
    }{
        {input{1, 2}, 3},
        {input{3, 5}, 8},
    }
    for _, test := range tests {
        result := mypackage.Sum(test.input.a, test.input.b)
        if result != test.expected {
            t.Errorf("Unexpected result: got %v, want %v", result, test.expected)
        }
    }
}

In this test function, we define slices of different input/expected combinations to test, then make calls to the function and verify that the results are as expected. If the results don't match, the test fails.

3. Run the test:

go test -v

The output will look like this:

PASS
ok      mypackage 0.003s

Indicates that the test passed successfully.

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