feat: add comprehensive test suite for recent backend changes

backend/handlers/admin/bookings_fields_test.go

@@ -0,0 +1,76 @@
+//go:build test
+// +build test
+
+package admin
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"crussell/db"
+	"crussell/handlers/bookings"
+	"crussell/testutils/fixtures"
+)
+
+// TestAdminBookings_Get_EnrichedFields verifies that CreatedByName and User.DateOfBirth are populated.
+func TestAdminBookings_Get_EnrichedFields(t *testing.T) {
+	resetTestData(t)
+
+	adminID, err := fixtures.CreateTestAdminUser(db.DB)
+	if err != nil {
+		t.Fatalf("failed to create admin user: %v", err)
+	}
+	defer fixtures.DeleteUser(db.DB, adminID)
+
+	userID, err := fixtures.CreateTestUser(db.DB)
+	if err != nil {
+		t.Fatalf("failed to create test user: %v", err)
+	}
+	defer fixtures.DeleteUser(db.DB, userID)
+
+	serviceID, err := fixtures.CreateTestService(db.DB)
+	if err != nil {
+		t.Fatalf("failed to create test service: %v", err)
+	}
+	defer fixtures.DeleteService(db.DB, serviceID)
+
+	bookingID, err := fixtures.CreateTestBooking(db.DB, userID, serviceID)
+	if err != nil {
+		t.Fatalf("failed to create test booking: %v", err)
+	}
+	defer fixtures.DeleteBooking(db.DB, bookingID)
+
+	dob := "1990-01-01"
+	_, err = db.DB.Exec(context.Background(), "UPDATE users SET date_of_birth = $1 WHERE id = $2", dob, userID)
+	if err != nil {
+		t.Fatalf("failed to update user dob: %v", err)
+	}
+
+	_, err = db.DB.Exec(context.Background(), "UPDATE bookings SET created_by = $1 WHERE id = $2", adminID, bookingID)
+	if err != nil {
+		t.Fatalf("failed to update booking created_by: %v", err)
+	}
+
+	handler := http.HandlerFunc(bookings.GetAdminBookingHandler)
+	w := makeAdminRequest(handler, "GET", "/api/admin/bookings/"+bookingID, nil)
+
+	if w.Code != http.StatusOK {
+		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
+	}
+
+	var booking bookings.Booking
+	if err := parseResponseBody(w, &booking); err != nil {
+		t.Fatalf("failed to parse response: %v", err)
+	}
+
+	if booking.CreatedByName == nil {
+		t.Error("expected CreatedByName to be populated")
+	}
+
+	if booking.User == nil || booking.User.DateOfBirth == nil {
+		t.Error("expected User.DateOfBirth to be populated")
+	} else if *booking.User.DateOfBirth != dob {
+		t.Errorf("expected date_of_birth %s, got %s", dob, *booking.User.DateOfBirth)
+	}
+}