Testing and benchmarking

Context

The testing package provides unit tests and benchmarks. Write tests in *_test.go files. Benchmarks measure performance.

Example

Test a function and benchmark it.

Code example

// main.go
package main

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

// main_test.go
package main

import "testing"

func TestAdd(t *testing.T) {
    if Add(2, 3) != 5 {
        t.Error("Add(2,3) should be 5")
    }
}

func BenchmarkAdd(b *testing.B) {
    for i := 0; i < b.N; i++ {
        Add(1, 2)
    }
}

Output (run go test -bench=.)

PASS
BenchmarkAdd-8   1000000000   0.25 ns/op

Useful links

• testing package
• Go by Example: Testing