package main

import "testing"

// TestSum 使用表驱动测试，一次验证多组输入。
func TestSum(t *testing.T) {
	tests := []struct {
		name string
		a    int
		b    int
		want int
	}{
		{name: "positive", a: 2, b: 3, want: 5},
		{name: "zero", a: 0, b: 0, want: 0},
		{name: "negative", a: -2, b: -3, want: -5},
		{name: "mixed", a: -2, b: 3, want: 1},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := Sum(tt.a, tt.b); got != tt.want {
				t.Fatalf("Sum(%d, %d) = %d, want %d", tt.a, tt.b, got, tt.want)
			}
		})
	}
}