google.golang.org/api v0.273.1: googleapi.Error

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify google.golang.org/api/googleapi.Error in pkg:golang/google.golang.org/api@v0.273.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/google.golang.org/api@v0.273.1
Demonstrate these symbols/APIs:
  - google.golang.org/api/googleapi.Error

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:899487f61e539ae0cd72592c4ef883862b0d2653c99a9c229448e4d4e52a2f66","contract":["googleapi.CheckResponse parses an HTTP 404 JSON error response into a *googleapi.Error with Code, Message, and Errors[] populated","googleapi.Error.Error() formats the HTTP status code, message, and error item reasons","googleapi.Error.Wrap and Unwrap preserve underlying cause errors for errors.Is"],"goal":"verify google.golang.org/api/googleapi.Error in pkg:golang/google.golang.org/api@v0.273.1","kind":"HOW","packages":["pkg:golang/google.golang.org/api@v0.273.1"],"schemaVersion":1,"symbols":["google.golang.org/api/googleapi.Error"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/google.golang.org/api@v0.273.1"],"schemaVersion":1,"subject":"pkg:golang/google.golang.org/api@v0.273.1","symbols":["google.golang.org/api/googleapi.Error"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.25.0

require google.golang.org/api v0.273.1

google.golang.org/api v0.273.1 h1:L7G/TmpAMz0nKx/ciAVssVmWQiOF6+pOuXeKrWVsquY=
google.golang.org/api v0.273.1/go.mod h1:JbAt7mF+XVmWu6xNP8/+CTiGH30ofmCmk9nM8d8fHew=

{
  "schemaVersion": 1,
  "goal": "verify google.golang.org/api/googleapi.Error in pkg:golang/google.golang.org/api@v0.273.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/google.golang.org/api@v0.273.1"
  ],
  "symbols": [
    "google.golang.org/api/googleapi.Error"
  ]
}

package main

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"net/http"
	"strings"

	"google.golang.org/api/googleapi"
)

func main() {
	body := `{"error":{"code":404,"message":"resource not found","errors":[{"message":"resource not found","reason":"notFound"}]}}`
	resp := &http.Response{
		StatusCode: 404,
		Status:     "404 Not Found",
		Header:     http.Header{"Content-Type": []string{"application/json"}},
		Body:       io.NopCloser(bytes.NewBufferString(body)),
	}

	err := googleapi.CheckResponse(resp)
	if err == nil {
		panic("expected error from CheckResponse")
	}

	var gErr *googleapi.Error
	if !errors.As(err, &gErr) {
		panic("expected *googleapi.Error")
	}

	if gErr.Code != 404 {
		panic(fmt.Sprintf("unexpected Code: %d", gErr.Code))
	}
	if gErr.Message != "resource not found" {
		panic(fmt.Sprintf("unexpected Message: %s", gErr.Message))
	}
	if len(gErr.Errors) != 1 || gErr.Errors[0].Reason != "notFound" || gErr.Errors[0].Message != "resource not found" {
		panic(fmt.Sprintf("unexpected Errors slice: %+v", gErr.Errors))
	}
	if !strings.Contains(gErr.Error(), "googleapi: Error 404: resource not found, notFound") {
		panic(fmt.Sprintf("unexpected Error() string: %s", gErr.Error()))
	}

	sentinel := errors.New("underlying cause")
	directErr := &googleapi.Error{
		Code:    400,
		Message: "bad request",
	}
	directErr.Wrap(sentinel)
	if !errors.Is(directErr, sentinel) || directErr.Unwrap() != sentinel {
		panic("expected Wrap/Unwrap to expose sentinel error")
	}
	if !strings.Contains(directErr.Error(), "googleapi: Error 400: bad request") {
		panic(fmt.Sprintf("unexpected direct Error() string: %s", directErr.Error()))
	}
}