How can I test my Go HTTP handlers using httptest?

How can I test my Go HTTP handlers using httptest?

You can use the httptest package in Go to create test servers and make requests to your HTTP handlers.

Can you show me a simple example of how to do that?

Sure! Here's a basic example:

package main

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

func TestMyHandler(t *testing.T) {
    req := httptest.NewRequest("GET", "http://example.com/foo", nil)
    w := httptest.NewRecorder()
    handler := http.HandlerFunc(MyHandler)

    handler.ServeHTTP(w, req)

    res := w.Result()
    // Check the response status code
    if res.StatusCode != http.StatusOK {
        t.Errorf("expected status OK; got %v", res.Status)
    }
}

This sets up a test for an HTTP handler called MyHandler.

What if I want to test a POST request?

You can create a POST request using httptest.NewRequest by specifying the method as "POST" and including a body. Here's an example:

req := httptest.NewRequest("POST", "http://example.com/foo", strings.NewReader("key=value"))

Make sure to set the appropriate headers as well!