test: failure for demonstration

hello/hello_test.go

@@ -13,4 +13,7 @@ func TestHelloHandler(t *testing.T) {
 	if w.Body.String() != expected {
 		t.Errorf("Expected %q but got %q", expected, w.Body.String())
 	}
+
+	// Force a failure for demonstration
+	t.Errorf("Forced failure for demonstration purposes")
 }