github.com/stretchr/testify v1.5.1: assert.NotEqual

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.NotEqual in pkg:golang/github.com/stretchr/testify@v1.5.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/testify@v1.5.1
Demonstrate these symbols/APIs:
  - github.com/stretchr/testify/assert.NotEqual

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:sha256:28581379fb8fe9978796efe257edbdeb47fe6b43984559b678b7f4e0b4a733de","contract":["assert.NotEqual returns true and records no error when comparing different primitive values","assert.NotEqual returns false and records an error when comparing identical values","assert.NotEqual returns true when comparing values of different types with equal numeric magnitude","assert.NotEqual returns true for slices with different elements or lengths and false for identical slices","assert.NotEqual returns true when comparing nil against a non-nil pointer and false when comparing two nil values"],"goal":"verify github.com/stretchr/testify/assert.NotEqual in pkg:golang/github.com/stretchr/testify@v1.5.1","kind":"HOW","packages":["pkg:golang/github.com/stretchr/testify@v1.5.1"],"schemaVersion":1,"symbols":["github.com/stretchr/testify/assert.NotEqual"]},"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/github.com/stretchr/testify@v1.5.1"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/testify@v1.5.1","symbols":["github.com/stretchr/testify/assert.NotEqual"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/stretchr/testify v1.5.1

require (
	github.com/davecgh/go-spew v1.1.0 // indirect
	github.com/pmezard/go-difflib v1.0.0 // indirect
	gopkg.in/yaml.v2 v2.2.2 // 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 v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
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.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

package main

import (
	"fmt"

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

// Reporter implements assert.TestingT to record assertion failure events.
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...))
}

// Config represents service configuration parameters.
type Config struct {
	Port int
	Host string
}

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

	// Example 1: Comparing different string values
	defaultRole := "guest"
	assignedRole := "admin"
	if assert.NotEqual(reporter, defaultRole, assignedRole, "roles should not match") {
		fmt.Println("Role comparison verified.")
	}

	// Example 2: Comparing struct values
	primaryConfig := Config{Port: 8080, Host: "localhost"}
	backupConfig := Config{Port: 8443, Host: "localhost"}
	if assert.NotEqual(reporter, primaryConfig, backupConfig, "configs should differ in port") {
		fmt.Println("Config difference verified.")
	}

	// Example 3: Comparing slice contents
	listA := []int{1, 2, 3}
	listB := []int{1, 2, 4}
	if assert.NotEqual(reporter, listA, listB, "slices should not match") {
		fmt.Println("Slice inequality verified.")
	}

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

{
  "schemaVersion": 1,
  "goal": "verify github.com/stretchr/testify/assert.NotEqual in pkg:golang/github.com/stretchr/testify@v1.5.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/testify@v1.5.1"
  ],
  "symbols": [
    "github.com/stretchr/testify/assert.NotEqual"
  ]
}

package main

import (
	"fmt"
	"os"

	"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.NotEqual returns true and records no error when comparing different primitive values
	{
		t := &contractTestingT{}
		if !assert.NotEqual(t, 10, 20) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: NotEqual should return true for distinct ints\n")
			os.Exit(1)
		}
		if !assert.NotEqual(t, "alpha", "beta") || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: NotEqual should return true for distinct strings\n")
			os.Exit(1)
		}
		if !assert.NotEqual(t, true, false) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: NotEqual should return true for distinct booleans\n")
			os.Exit(1)
		}
	}

	// Assertion 2: assert.NotEqual returns false and records an error when comparing identical values
	{
		tInt := &contractTestingT{}
		if assert.NotEqual(tInt, 42, 42) || !tInt.failed || len(tInt.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: NotEqual should return false and record error for identical ints\n")
			os.Exit(1)
		}

		tStr := &contractTestingT{}
		if assert.NotEqual(tStr, "same", "same") || !tStr.failed || len(tStr.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: NotEqual should return false and record error for identical strings\n")
			os.Exit(1)
		}
	}

	// Assertion 3: assert.NotEqual returns true when comparing values of different types with equal numeric magnitude
	{
		tTypeMismatch := &contractTestingT{}
		if !assert.NotEqual(tTypeMismatch, int(100), int64(100)) || tTypeMismatch.failed || len(tTypeMismatch.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: NotEqual should return true for int vs int64\n")
			os.Exit(1)
		}

		tFloatInt := &contractTestingT{}
		if !assert.NotEqual(tFloatInt, float64(1.0), int(1)) || tFloatInt.failed || len(tFloatInt.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: NotEqual should return true for float64 vs int\n")
			os.Exit(1)
		}
	}

	// Assertion 4: assert.NotEqual returns true for slices with different elements or lengths and false for identical slices
	{
		tDiffElem := &contractTestingT{}
		if !assert.NotEqual(tDiffElem, []string{"a", "b"}, []string{"a", "c"}) || tDiffElem.failed || len(tDiffElem.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: NotEqual should return true for slices with different elements\n")
			os.Exit(1)
		}

		tDiffLen := &contractTestingT{}
		if !assert.NotEqual(tDiffLen, []int{1, 2}, []int{1, 2, 3}) || tDiffLen.failed || len(tDiffLen.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: NotEqual should return true for slices with different lengths\n")
			os.Exit(1)
		}

		tSame := &contractTestingT{}
		if assert.NotEqual(tSame, []int{1, 2}, []int{1, 2}) || !tSame.failed || len(tSame.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: NotEqual should return false for identical slices\n")
			os.Exit(1)
		}
	}

	// Assertion 5: assert.NotEqual returns true when comparing nil against a non-nil pointer and false when comparing two nil values
	{
		tNilPtr := &contractTestingT{}
		val := 123
		if !assert.NotEqual(tNilPtr, nil, &val) || tNilPtr.failed || len(tNilPtr.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: NotEqual should return true for nil vs non-nil pointer\n")
			os.Exit(1)
		}

		tBothNil := &contractTestingT{}
		if assert.NotEqual(tBothNil, nil, nil) || !tBothNil.failed || len(tBothNil.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: NotEqual should return false for nil vs nil\n")
			os.Exit(1)
		}
	}

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