github.com/stretchr/testify v1.3.0: assert.NotPanics

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 github.com/stretchr/testify/assert.NotPanics in pkg:golang/github.com/stretchr/testify@v1.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/testify@v1.3.0
Demonstrate these symbols/APIs:
  - github.com/stretchr/testify/assert.NotPanics

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:f8bd22b00e8a85dbe0fb9d40f3668de905dfec6b2f02e6695e5c018e68d2d1ac","contract":["assert.NotPanics returns true and records no error when function executes without panicking","assert.NotPanics returns false and reports error when function panics with string","assert.NotPanics recovers from error type panic and reports failure","assert.NotPanics recovers from arbitrary non-string panic values and reports failure","assert.NotPanics formats failure message with provided msgAndArgs on panic"],"goal":"verify github.com/stretchr/testify/assert.NotPanics in pkg:golang/github.com/stretchr/testify@v1.3.0","kind":"HOW","packages":["pkg:golang/github.com/stretchr/testify@v1.3.0"],"schemaVersion":1,"symbols":["github.com/stretchr/testify/assert.NotPanics"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","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/stretchr/testify@v1.3.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/testify@v1.3.0","symbols":["github.com/stretchr/testify/assert.NotPanics"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/stretchr/testify v1.3.0

require (
	github.com/davecgh/go-spew v1.1.0 // indirect
	github.com/pmezard/go-difflib v1.0.0 // indirect
)

github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=

package main

import (
	"fmt"

	"github.com/stretchr/testify/assert"
)

// Reporter implements assert.TestingT to record assertion results.
type Reporter struct {
	Errors []string
	Passed int
	Failed int
}

func (r *Reporter) Errorf(format string, args ...interface{}) {
	r.Errors = append(r.Errors, fmt.Sprintf(format, args...))
	r.Failed++
}

func main() {
	reporter := &Reporter{}

	// Verify a function that does not panic
	safeFunc := func() {
		_ = 1 + 1
	}
	if assert.NotPanics(reporter, safeFunc, "safeFunc should not panic") {
		reporter.Passed++
	}

	// Verify a function that panics fails the assertion
	panickingFunc := func() {
		panic("unexpected error")
	}
	if !assert.NotPanics(reporter, panickingFunc, "panickingFunc should fail NotPanics") {
		// As expected, panic causes NotPanics to return false and log an error
	}

	fmt.Printf("Evaluation complete: %d passed, %d failed as expected\n", reporter.Passed, reporter.Failed)
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/stretchr/testify/assert.NotPanics in pkg:golang/github.com/stretchr/testify@v1.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/testify@v1.3.0"
  ],
  "symbols": [
    "github.com/stretchr/testify/assert.NotPanics"
  ]
}

package main

import (
	"errors"
	"fmt"
	"os"
	"strings"

	"github.com/stretchr/testify/assert"
)

type contractTestingT struct {
	errors []string
	failed bool
}

func (t *contractTestingT) Errorf(format string, args ...interface{}) {
	t.failed = true
	t.errors = append(t.errors, fmt.Sprintf(format, args...))
}

func main() {
	// Assertion 1: assert.NotPanics returns true and records no error when function executes without panicking
	{
		t := &contractTestingT{}
		res := assert.NotPanics(t, func() {
			val := 10 + 20
			_ = val
		})
		if !res || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: assert.NotPanics should return true with no error on non-panicking function\n")
			os.Exit(1)
		}
	}

	// Assertion 2: assert.NotPanics returns false and reports error when function panics with string
	{
		t := &contractTestingT{}
		res := assert.NotPanics(t, func() {
			panic("intentional string panic")
		})
		if res || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: assert.NotPanics should return false and report error on string panic\n")
			os.Exit(1)
		}
	}

	// Assertion 3: assert.NotPanics recovers from error type panic and reports failure
	{
		t := &contractTestingT{}
		res := assert.NotPanics(t, func() {
			panic(errors.New("intentional error panic"))
		})
		if res || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: assert.NotPanics should recover from error panic and report failure\n")
			os.Exit(1)
		}
	}

	// Assertion 4: assert.NotPanics recovers from arbitrary non-string panic values and reports failure
	{
		t := &contractTestingT{}
		res := assert.NotPanics(t, func() {
			panic(404)
		})
		if res || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: assert.NotPanics should recover from integer panic and report failure\n")
			os.Exit(1)
		}
	}

	// Assertion 5: assert.NotPanics formats failure message with provided msgAndArgs on panic
	{
		t := &contractTestingT{}
		customMsg := "custom panic expectation message"
		res := assert.NotPanics(t, func() {
			panic("unexpected boom")
		}, customMsg)
		if res || !t.failed || len(t.errors) == 0 || !strings.Contains(t.errors[0], customMsg) {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: assert.NotPanics should include custom message in error output\n")
			os.Exit(1)
		}
	}

	fmt.Println("All contract assertions passed successfully.")
}