github.com/go-logr/logr v1.4.1: testr.New

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 testr.New in pkg:golang/github.com/go-logr/logr@v1.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/go-logr/logr@v1.4.1
Demonstrate these symbols/APIs:
  - testr.New
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:1a09ff07af54a879086bdd378b8e57b386c1240ff1dbe4a849a05819d0a38cf3","contract":["testr.New returns a valid logr.Logger wrapping a testing.T instance with a non-nil LogSink.","testr.New produces a logger with V(0) level logging enabled by default.","testr.New produces a logger with V(1) level logging disabled by default without custom Options.","testr.New logger logs info messages and errors through testing.T without panic.","testr.New logger supports WithName and WithValues creating structured child loggers."],"goal":"verify testr.New in pkg:golang/github.com/go-logr/logr@v1.4.1","kind":"HOW","packages":["pkg:golang/github.com/go-logr/logr@v1.4.1"],"schemaVersion":1,"symbols":["testr.New"]},"contractCommand":["go","test","./..."],"environment":{"arch":"amd64","compiler":"go","compilerVersion":"1.26.6","distro":"ubuntu","ecosystem":"golang","language":"go","languageVersion":"1.26","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/go-logr/logr@v1.4.1"],"schemaVersion":1,"subject":"pkg:golang/github.com/go-logr/logr@v1.4.1","symbols":["testr.New"],"verifierAdapter":"golang@1"}

module sample

go 1.22

require github.com/go-logr/logr v1.4.1

github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=

package sample

import (
	"testing"

	"github.com/go-logr/logr"
	"github.com/go-logr/logr/testr"
)

// CreateTestLogger creates a logr.Logger using testr.New.
func CreateTestLogger(t *testing.T) logr.Logger {
	return testr.New(t)
}

{
  "schemaVersion": 1,
  "goal": "verify testr.New in pkg:golang/github.com/go-logr/logr@v1.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/go-logr/logr@v1.4.1"
  ],
  "symbols": [
    "testr.New"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

package test

import (
	"errors"
	"testing"

	"github.com/go-logr/logr"
	"github.com/go-logr/logr/testr"
	"sample"
)

func TestContract(t *testing.T) {
	// 1. testr.New returns a valid logr.Logger wrapping testing.T
	var logger logr.Logger = testr.New(t)
	if logger.GetSink() == nil {
		t.Fatalf("expected non-nil LogSink from testr.New(t)")
	}

	// Also verify via sample helper
	helperLogger := sample.CreateTestLogger(t)
	if helperLogger.GetSink() == nil {
		t.Fatalf("expected non-nil LogSink from sample.CreateTestLogger(t)")
	}

	// 2. Default logger has V(0) enabled
	if !logger.V(0).Enabled() {
		t.Fatalf("expected V(0) to be enabled by default")
	}

	// 3. Default logger has V(1) disabled without options
	if logger.V(1).Enabled() {
		t.Fatalf("expected V(1) to be disabled by default")
	}

	// 4. Info logging executes without panicking
	logger.Info("informational test message", "key", "value", "count", 42)

	// 5. Error logging executes without panicking
	testErr := errors.New("simulated test error")
	logger.Error(testErr, "error test message", "component", "testing")

	// 6. WithName returns a child logger with hierarchical name
	namedLogger := logger.WithName("child-scope")
	if namedLogger.GetSink() == nil {
		t.Fatalf("expected non-nil LogSink from named logger")
	}
	namedLogger.Info("child logger message", "subsystem", "auth")

	// 7. WithValues returns a child logger with key-value context
	valLogger := logger.WithValues("request_id", "req-12345")
	if valLogger.GetSink() == nil {
		t.Fatalf("expected non-nil LogSink from values logger")
	}
	valLogger.Info("request processed successfully")
}