test(server): add unit test for HandlePing (#33)

Added a unit test for the HandlePing method in internal/server/server.go using httptest.
This ensures the handler returns the correct status code, body, and headers.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: adcondev

internal/server/server_test.go

@@ -0,0 +1,43 @@
+package server
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestHandlePing(t *testing.T) {
+	// Create a minimal server instance since HandlePing doesn't use any fields
+	srv := &Server{}
+
+	// Create a request
+	req := httptest.NewRequest("GET", "/ping", nil)
+	w := httptest.NewRecorder()
+
+	// Call the handler
+	srv.HandlePing(w, req)
+
+	// Check the status code
+	if status := w.Code; status != http.StatusOK {
+		t.Errorf("handler returned wrong status code: got %v want %v",
+			status, http.StatusOK)
+	}
+
+	// Check the response body
+	expected := "pong"
+	if w.Body.String() != expected {
+		t.Errorf("handler returned unexpected body: got %v want %v",
+			w.Body.String(), expected)
+	}
+
+	// Check the headers
+	if origin := w.Header().Get("Access-Control-Allow-Origin"); origin != "*" {
+		t.Errorf("handler returned wrong Access-Control-Allow-Origin: got %v want %v",
+			origin, "*")
+	}
+
+	if contentType := w.Header().Get("Content-Type"); contentType != "text/plain" {
+		t.Errorf("handler returned wrong Content-Type: got %v want %v",
+			contentType, "text/plain")
+	}
+}