test-app-code/main_test.go at main · surajincloud/test-app-code · GitHub

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package main

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

func TestHandler(t *testing.T) {
	req, err := http.NewRequest("GET", "/", nil)
	if err != nil {
		t.Fatal(err)
	}

	rr := httptest.NewRecorder()
	handler := http.HandlerFunc(foundHandler)

	handler.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Errorf("handler returned wrong status code: got %v want %v",
			rr.Code, http.StatusOK)
	}

	expected := "New feature: Hello World from "
	if rr.Body.String() != expected {
		t.Errorf("handler returned unexpected body: got %v want %v",
			rr.Body.String(), expected)
	}
}

func TestNotFoundHandler(t *testing.T) {
	req, err := http.NewRequest("GET", "/err", nil)
	if err != nil {
		t.Fatal(err)
	}

	rr := httptest.NewRecorder()
	handler := http.HandlerFunc(notfoundHandler)

	handler.ServeHTTP(rr, req)

	if rr.Code != http.StatusNotFound {
		t.Errorf("handler returned wrong status code: got %v want %v",
			rr.Code, http.StatusNotFound)
	}
}

func TestInternalServerErrorHandler(t *testing.T) {
	req, err := http.NewRequest("GET", "/internal-err", nil)
	if err != nil {
		t.Fatal(err)
	}

	rr := httptest.NewRecorder()
	handler := http.HandlerFunc(internalErrorHandler)

	handler.ServeHTTP(rr, req)

	if rr.Code != http.StatusInternalServerError {
		t.Errorf("handler returned wrong status code: got %v want %v",
			rr.Code, http.StatusInternalServerError)
	}
}

func TestMetricsHandler(t *testing.T) {
	req, err := http.NewRequest("GET", "/metrics", nil)
	if err != nil {
		t.Fatal(err)
	}

	rr := httptest.NewRecorder()

	// Create a new Prometheus registry
	r := prometheus.NewRegistry()

	// Register the necessary metrics
	r.MustRegister(httpRequestsTotal)
	r.MustRegister(httpRequestDuration)
	r.MustRegister(version)

	// Create the metrics handler
	handler := promhttp.HandlerFor(r, promhttp.HandlerOpts{})

	handler.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Errorf("handler returned wrong status code: got %v want %v",
			rr.Code, http.StatusOK)
	}
}