📊 Capítulo 15: Testes de Integração com httptest

Especialização Backend com Go & Gin Gonic

🗺️ O Fluxo de Testes HTTP em Memória

flowchart TD
    TEST["Função de Teste: TestCriarUsuario(t *testing.T)"]
    --> RECORDER["w := httptest.NewRecorder() (Capturador de Resposta)"]
    --> REQ["req := httptest.NewRequest('POST', '/api/v1/usuarios', payload)"]
    --> ENGINE["router.ServeHTTP(w, req) (Executa a Engine em Memória / Sem subir porta TCP!)"]
    --> ASSERT["assert.Equal(t, http.StatusCreated, w.Code)\nassert.JSONEq(t, expected, w.Body.String())"]

    style TEST fill:#ede7f6,stroke:#512da8,stroke-width:2px
    style RECORDER fill:#fff3e0,stroke:#ff9800,stroke-width:1.5px
    style REQ fill:#e1f5fe,stroke:#03a9f4,stroke-width:1.5px
    style ENGINE fill:#e8f5e9,stroke:#4caf50,stroke-width:2px
    style ASSERT fill:#c8e6c9,stroke:#2e7d32,stroke-width:2px

🎯 Slide 1: Testando Endpoints com net/http/httptest

func TestHealthCheck(t *testing.T) {
    gin.SetMode(gin.TestMode)
    r := gin.New()
    r.GET("/health", HealthHandler)

    req, _ := http.NewRequest("GET", "/health", nil)
    w := httptest.NewRecorder()
    r.ServeHTTP(w, req)

    assert.Equal(t, http.StatusOK, w.Code)
    assert.Contains(t, w.Body.String(), "online")
}

🎯 Slide 2: Mocking da Camada Service com testify/mock

• Crie structs de Mock que implementam as interfaces do Service para testar cenários de sucesso, erro de banco e validação de parâmetros sem tocar no PostgreSQL!

🎯 Slide 3: Cobertura de Testes com go test -cover

go test -v -coverprofile=coverage.out ./...
go tool cover -html=coverage.out