go test报错 wrong signature for TestAdd, must be: func TestAdd(t *testing.T)

参考: https://www.cnblogs.com/mingbai/p/gotesterr.html

背景

学习 Go 过程中，在终端输入 go test 显示报错:

$ wrong signature for TestAdd, must be: func TestAdd(t *testing.T)

后经搜索该报错查明示由于 func TestAdd(t testing.T) 参数未带 *，需要改为 func TestAdd(t *testing.T)

问题复现

报错代码如下:

// calculation_util_test.go
package calculation_util

import "testing"

func TestAdd(t testing.T) {
	tests := []struct{ a, b, c int }{
		{1, 2, 3},
		{1, 3, 4},
		{1, 1, 2},
	}
	for _, test := range tests {
		actualVal := Add(test.a, test.b)
		expectVal := test.c
		if actualVal != expectVal {
			t.Errorf("Add(%d, %d) actualVal: %d, but expectVal: %d", test.a, test.b, actualVal, expectVal)
		}
	}
}

如何解决

修改后的代码:

// calculation_util_test.go
package calculation_util

import "testing"

func TestAdd(t *testing.T) {
	tests := []struct{ a, b, c int }{
		{1, 2, 3},
		{1, 3, 4},
		{1, 1, 2},
	}
	for _, test := range tests {
		actualVal := Add(test.a, test.b)
		expectVal := test.c
		if actualVal != expectVal {
			t.Errorf("Add(%d, %d) actualVal: %d, but expectVal: %d", test.a, test.b, actualVal, expectVal)
		}
	}
}

测试通过！