Testing code that uses JSON in Go is crucial, and this article provides the following steps: Write JSON data, encoding to byte slices using json.Marshal. Decode JSON data, parsing from byte slice to struct using json.Unmarshal.
How to test code that uses JSON in Golang
Testing code that uses JSON in Golang is important to ensure the robustness of the application Sex is crucial. This article will guide you through the following steps for testing:
1. Write JSON data
import ( "encoding/json" "fmt" "testing" ) type Person struct { Name string `json:"name"` Age int `json:"age"` } func TestEncodeJSON(t *testing.T) { person := Person{Name: "John", Age: 30} b, err := json.Marshal(person) if err != nil { t.Errorf("Error encoding JSON: %v", err) } expected := `{"name":"John","age":30}` if string(b) != expected { t.Errorf("Expected '%s', got '%s'", expected, string(b)) } }
2. Decode JSON data
func TestDecodeJSON(t *testing.T) { jsonStr := `{"name":"Mary","age":25}` person := Person{} err := json.Unmarshal([]byte(jsonStr), &person) if err != nil { t.Errorf("Error decoding JSON: %v", err) } expected := Person{Name: "Mary", Age: 25} if person != expected { t.Errorf("Expected '%v', got '%v'", expected, person) } }
Practical case
Consider a function that reads a JSON configuration file:
func LoadConfig(path string) (Config, error) { b, err := ioutil.ReadFile(path) if err != nil { return Config{}, err } config := Config{} err = json.Unmarshal(b, &config) if err != nil { return Config{}, err } return config, nil }
The following test case will verify whether the LoadConfig
function reads correctly JSON file:
func TestLoadConfig(t *testing.T) { // 创建一个包含 JSON 数据的临时文件 f, err := ioutil.TempFile("", "config") if err != nil { t.Errorf("Error creating temporary file: %v", err) } defer os.Remove(f.Name()) _, err = f.WriteString(`{"key":"value"}`) if err != nil { t.Errorf("Error writing to temporary file: %v", err) } if err := f.Close(); err != nil { t.Errorf("Error closing temporary file: %v", err) } config, err := LoadConfig(f.Name()) if err != nil { t.Errorf("Error loading config: %v", err) } expected := Config{Key: "value"} if config != expected { t.Errorf("Expected '%v', got '%v'", expected, config) } }
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