github.com/stretchr/testify v1.7.5: assert.Equal

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.Equal in pkg:golang/github.com/stretchr/testify@v1.7.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/testify@v1.7.5
Demonstrate these symbols/APIs:
  - github.com/stretchr/testify/assert.Equal

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:sha256:8de56cd3bee0611351447736d04513d467b714591760ed104af2d47ea8c6ba36","contract":["assert.Equal returns true and records no error when primitive values match","assert.Equal returns false and records an error when primitive values differ","assert.Equal returns false when numeric types differ despite equal numeric value","assert.Equal performs deep equality checks on slices, maps, and structs","assert.Equal handles untyped nil comparisons and includes custom failure messages"],"goal":"verify github.com/stretchr/testify/assert.Equal in pkg:golang/github.com/stretchr/testify@v1.7.5","kind":"HOW","packages":["pkg:golang/github.com/stretchr/testify@v1.7.5"],"schemaVersion":1,"symbols":["github.com/stretchr/testify/assert.Equal"]},"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@v1.7.5"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/testify@v1.7.5","symbols":["github.com/stretchr/testify/assert.Equal"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/stretchr/testify v1.7.5

require (
	github.com/davecgh/go-spew v1.1.1 // indirect
	github.com/pmezard/go-difflib v1.0.0 // indirect
	gopkg.in/yaml.v3 v3.0.1 // indirect
)

github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/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/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.5 h1:s5PTfem8p8EbKQOctVV53k6jCJt3UX4IEJzwh+C324Q=
github.com/stretchr/testify v1.7.5/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

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

type spyT struct {
	errors []string
}

func (s *spyT) Errorf(format string, args ...interface{}) {
	s.errors = append(s.errors, fmt.Sprintf(format, args...))
}

func main() {
	t := &spyT{}
	ok := assert.Equal(t, 42, 42, "values must match")
	fmt.Printf("equal=%v errors=%d\n", ok, len(t.errors))
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/stretchr/testify/assert.Equal in pkg:golang/github.com/stretchr/testify@v1.7.5",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/testify@v1.7.5"
  ],
  "symbols": [
    "github.com/stretchr/testify/assert.Equal"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

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

type mockT struct {
	failed bool
	errors []string
}

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

func main() {
	// 1. assert.Equal returns true and records no error when primitive values match
	{
		t := &mockT{}
		if !assert.Equal(t, "alpha", "alpha") || t.failed || len(t.errors) != 0 {
			fmt.Fprintln(os.Stderr, "contract 1 failed: matching strings")
			os.Exit(1)
		}
		if !assert.Equal(t, 99, 99) || t.failed || len(t.errors) != 0 {
			fmt.Fprintln(os.Stderr, "contract 1 failed: matching ints")
			os.Exit(1)
		}
	}

	// 2. assert.Equal returns false and records an error when primitive values differ
	{
		t := &mockT{}
		if assert.Equal(t, "alpha", "beta") || !t.failed || len(t.errors) != 1 {
			fmt.Fprintln(os.Stderr, "contract 2 failed: differing strings")
			os.Exit(1)
		}
	}

	// 3. assert.Equal returns false when numeric types differ despite equal numeric value
	{
		t := &mockT{}
		if assert.Equal(t, int(7), int64(7)) || !t.failed || len(t.errors) != 1 {
			fmt.Fprintln(os.Stderr, "contract 3 failed: differing numeric types")
			os.Exit(1)
		}
	}

	// 4. assert.Equal performs deep equality checks on slices, maps, and structs
	{
		t := &mockT{}
		type item struct {
			ID   int
			Tags []string
		}
		a := item{ID: 1, Tags: []string{"x", "y"}}
		b := item{ID: 1, Tags: []string{"x", "y"}}
		if !assert.Equal(t, a, b) || t.failed {
			fmt.Fprintln(os.Stderr, "contract 4 failed: matching structs")
			os.Exit(1)
		}
		m1 := map[string]int{"k": 10}
		m2 := map[string]int{"k": 10}
		if !assert.Equal(t, m1, m2) || t.failed {
			fmt.Fprintln(os.Stderr, "contract 4 failed: matching maps")
			os.Exit(1)
		}
		tDiff := &mockT{}
		c := item{ID: 1, Tags: []string{"x", "z"}}
		if assert.Equal(tDiff, a, c) || !tDiff.failed {
			fmt.Fprintln(os.Stderr, "contract 4 failed: differing structs")
			os.Exit(1)
		}
	}

	// 5. assert.Equal handles untyped nil comparisons and includes custom failure messages
	{
		t := &mockT{}
		if !assert.Equal(t, nil, nil) || t.failed {
			fmt.Fprintln(os.Stderr, "contract 5 failed: nil == nil")
			os.Exit(1)
		}
		tFail := &mockT{}
		msg := "custom failure note: expected matching port"
		if assert.Equal(tFail, 8080, 9090, msg) || !tFail.failed || len(tFail.errors) == 0 || !strings.Contains(tFail.errors[0], msg) {
			fmt.Fprintln(os.Stderr, "contract 5 failed: custom message formatting")
			os.Exit(1)
		}
	}

	fmt.Println("contract ok")
}