github.com/stretchr/testify v1.7.0: 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 assert.Equal in pkg:golang/github.com/stretchr/testify@v1.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/testify@v1.7.0
Demonstrate these symbols/APIs:
  - 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:sha256:78f3a21c6995637d6bf87165ed5ed08af6fe386f1b8cff6aedff15c8ab57066c","contract":["assert.Equal returns true and records no error when comparing identical primitive values","assert.Equal returns false and records an error when comparing different values of the same type","assert.Equal returns false and records an error when comparing values of different types even if numeric magnitude matches","assert.Equal returns true for structurally equivalent structs and identical slices, and false when slice elements differ","assert.Equal returns true when comparing two nil values and false when comparing nil against a non-nil pointer","assert.Equal formats and appends custom message arguments when an assertion fails"],"goal":"verify assert.Equal in pkg:golang/github.com/stretchr/testify@v1.7.0","kind":"HOW","packages":["pkg:golang/github.com/stretchr/testify@v1.7.0"],"schemaVersion":1,"symbols":["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@v1.7.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/testify@v1.7.0","symbols":["assert.Equal"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/stretchr/testify v1.7.0

require (
	github.com/davecgh/go-spew v1.1.0 // indirect
	github.com/pmezard/go-difflib v1.0.0 // indirect
	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // 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 v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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 h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

package main

import (
	"fmt"

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

// Reporter implements assert.TestingT to record assertion outcomes.
type Reporter struct {
	errors []string
	failed bool
}

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

// UserProfile represents sample user data for struct comparison.
type UserProfile struct {
	ID   int
	Role string
}

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

	// Example 1: Comparing primitive values
	expectedStatus := 200
	actualStatus := 200
	if assert.Equal(reporter, expectedStatus, actualStatus, "status code should match") {
		fmt.Println("Status code matches expected value.")
	}

	// Example 2: Comparing struct values
	expectedProfile := UserProfile{ID: 101, Role: "editor"}
	actualProfile := UserProfile{ID: 101, Role: "editor"}
	if assert.Equal(reporter, expectedProfile, actualProfile, "user profile should match") {
		fmt.Println("User profile matches expected struct.")
	}

	// Example 3: Comparing slices
	expectedTags := []string{"go", "testing"}
	actualTags := []string{"go", "testing"}
	if assert.Equal(reporter, expectedTags, actualTags, "tags slice should match") {
		fmt.Println("Tags slice matches expected elements.")
	}

	if !reporter.failed {
		fmt.Println("All assert.Equal demonstrations succeeded.")
	}
}

{
  "schemaVersion": 1,
  "goal": "verify assert.Equal in pkg:golang/github.com/stretchr/testify@v1.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/testify@v1.7.0"
  ],
  "symbols": [
    "assert.Equal"
  ]
}

package main

import (
	"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...))
}

type sampleConfig struct {
	Name  string
	Count int
}

func main() {
	// Assertion 1: assert.Equal returns true and records no error when comparing identical primitive values
	{
		t := &contractTestingT{}
		if !assert.Equal(t, 42, 42) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: expected true for identical integers\n")
			os.Exit(1)
		}
		if !assert.Equal(t, "hello", "hello") || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: expected true for identical strings\n")
			os.Exit(1)
		}
	}

	// Assertion 2: assert.Equal returns false and records an error when comparing different values of the same type
	{
		t := &contractTestingT{}
		if assert.Equal(t, "expected", "actual") || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: expected false and error for mismatched strings\n")
			os.Exit(1)
		}
	}

	// Assertion 3: assert.Equal returns false and records an error when comparing values of different types even if numeric magnitude matches
	{
		t := &contractTestingT{}
		if assert.Equal(t, int(10), int64(10)) || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: expected false and error for mismatched types\n")
			os.Exit(1)
		}
	}

	// Assertion 4: assert.Equal returns true for structurally equivalent structs and identical slices, and false when slice elements differ
	{
		t := &contractTestingT{}
		c1 := sampleConfig{Name: "app", Count: 3}
		c2 := sampleConfig{Name: "app", Count: 3}
		if !assert.Equal(t, c1, c2) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: expected true for equal structs\n")
			os.Exit(1)
		}

		s1 := []string{"alpha", "beta"}
		s2 := []string{"alpha", "beta"}
		if !assert.Equal(t, s1, s2) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: expected true for equal slices\n")
			os.Exit(1)
		}

		s3 := []string{"alpha", "gamma"}
		if assert.Equal(t, s1, s3) || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: expected false for differing slices\n")
			os.Exit(1)
		}
	}

	// Assertion 5: assert.Equal returns true when comparing two nil values and false when comparing nil against a non-nil pointer
	{
		tNil := &contractTestingT{}
		if !assert.Equal(tNil, nil, nil) || tNil.failed || len(tNil.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: expected true for nil == nil\n")
			os.Exit(1)
		}

		val := 10
		tPtr := &contractTestingT{}
		if assert.Equal(tPtr, nil, &val) || !tPtr.failed || len(tPtr.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: expected false for nil == &val\n")
			os.Exit(1)
		}
	}

	// Assertion 6: assert.Equal formats and appends custom message arguments when an assertion fails
	{
		t := &contractTestingT{}
		customMsg := "custom failure identifier"
		assert.Equal(t, "left", "right", "message %s", customMsg)
		if !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 6 failed: expected failure on mismatched values\n")
			os.Exit(1)
		}
		found := false
		for _, errStr := range t.errors {
			if strings.Contains(errStr, customMsg) {
				found = true
				break
			}
		}
		if !found {
			fmt.Fprintf(os.Stderr, "assertion 6 failed: custom message not found in recorded errors: %v\n", t.errors)
			os.Exit(1)
		}
	}

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