Golang如何测试JSON反序列化

type User struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
    Email string `json:"email,omitempty"`
}

func TestUnmarshalUser(t *testing.T) {
    jsonStr := `{"id": 1, "name": "Alice", "email": "alice@example.com"}`
    var user User

    err := json.Unmarshal([]byte(jsonStr), &user)
    if err != nil {
        t.Fatalf("Unmarshal failed: %v", err)
    }

    if user.ID != 1 {
        t.Errorf("Expected ID 1, got %d", user.ID)
    }
    if user.Name != "Alice" {
        t.Errorf("Expected Name Alice, got %s", user.Name)
    }
    if user.Email != "alice@example.com" {
        t.Errorf("Expected Email alice@example.com, got %s", user.Email)
    }
}

func TestUnmarshalInvalidJSON(t *testing.T) {
    invalidJSON := `{id: 1}` // 缺少引号
    var user User
    err := json.Unmarshal([]byte(invalidJSON), &user)
    if err == nil {
        t.Fatal("Expected error for invalid JSON, but got nil")
    }
}

type Order struct {
    OrderID int     `json:"order_id"`
    Items   []Item  `json:"items"`
}

type Item struct {
    Product string `json:"product"`
    Price   float64 `json:"price"`
}