learn/golang-learn/38-table_driven_tests/add_test.go

package add

import "testing"

func TestAdd(t *testing.T) {
	// 1. 定义测试表：每行是 输入a, 输入b, 期望结果want
	tests := []struct {
		a, b, want int
		name       string // 给用例起个可读名字，失败时好定位
	}{
		{2, 3, 5, "positive"},
		{-1, -1, -2, "negative"},
		{0, 7, 7, "zero"},
		{0, 0, 0, "zero+zero"},
		{-5, 5, 0, "negative+positive"},
	}

	// 2. 遍历表格，一行就是一个子测试
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) { // 子测试，失败时能看到名字
			got := Add(tc.a, tc.b)
			if got != tc.want {
				t.Errorf("Add(%d, %d) = %d; want %d", tc.a, tc.b, got, tc.want)
			}
		})
	}
}