How to analyze the test coverage report of golang function?

Generate the coverage configuration file through the go test -cover command, use the gocov tool to install and generate an HTML report to view detailed coverage information. Specific steps include: Install the gocov tool. To run unit tests, add the -cover flag: go test -cover. Generate a coverage report: gocov convert -html coverage.out > coverage.html.

How to analyze the test coverage report of Golang function

The test coverage report provides information about which parts of the code have been tested insights. This helps identify areas of code that are not covered and guides further testing efforts.

Use go test -cover

Go language has built-in go test -cover command to generate test coverage Report. This command outputs a coverage configuration file that contains coverage information for each package and function.

Installation gocov Tools

gocov is a tool for visual coverage reporting. It can be installed from GitHub or via the following command:

go install github.com/wadey/gocov/gocov

Generate HTML Report

To generate interactive HTML reports, use the gocov tool :

gocov convert -html coverage.out > coverage.html

The generated coverage.html file can be opened in a web browser to view detailed coverage information.

Practical case

Suppose we have a function named add that is used to add two integers:

package main

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

func TestAdd(t *testing.T) {
    tests := []struct {
        a, b int
        want int
    }{
        {1, 2, 3},
        {3, 4, 7},
    }

    for _, test := range tests {
        if got := add(test.a, test.b); got != test.want {
            t.Errorf("add(%d, %d): got %d, want %d", test.a, test.b, got, test.want)
        }
    }
}

Run coverage test

Use the go test -cover command to run the unit test:

go test -cover

Generate coverage report

Generate and visualize the coverage report:

gocov convert -html coverage.out > coverage.html

Open the coverage.html file and you can see the coverage percentage of the add function. If coverage is less than 100%, it indicates that some code paths have not been covered by tests.

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