github.com/stretchr/testify v1.8.1: assert.InDelta

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.InDelta in pkg:golang/github.com/stretchr/testify@v1.8.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/stretchr/testify@v1.8.1
Demonstrate these symbols/APIs:
  - github.com/stretchr/testify/assert.InDelta

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:sha256:340d4af19e9f9d13e05dda1a172bea3f22d80b1464e26cd5182196d64ffe9ba3","contract":["assert.InDelta returns true and does not record an error when the difference between expected and actual is within delta","assert.InDelta returns true when the difference between expected and actual is exactly equal to delta","assert.InDelta returns false and records an error when the difference between expected and actual exceeds delta","assert.InDelta converts different numeric types to float64 for comparison","assert.InDelta returns false and records an error when a parameter is non-numeric or NaN"],"goal":"verify github.com/stretchr/testify/assert.InDelta in pkg:golang/github.com/stretchr/testify@v1.8.1","kind":"HOW","packages":["pkg:golang/github.com/stretchr/testify@v1.8.1"],"schemaVersion":1,"symbols":["github.com/stretchr/testify/assert.InDelta"]},"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@v1.8.1"],"schemaVersion":1,"subject":"pkg:golang/github.com/stretchr/testify@v1.8.1","symbols":["github.com/stretchr/testify/assert.InDelta"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/stretchr/testify v1.8.1

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/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
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"
)

// Reporter implements assert.TestingT to record assertion results.
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...))
}

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

	// Example 1: Verify floating-point calculation within an acceptable tolerance
	expectedSum := 0.3
	actualSum := 0.1 + 0.2
	tolerance := 1e-9

	if assert.InDelta(reporter, expectedSum, actualSum, tolerance, "sum should be within tolerance") {
		fmt.Println("Floating-point addition verified within delta tolerance.")
	}

	// Example 2: Verify numeric measurements across mixed types (int vs float)
	targetRPM := 3000
	measuredRPM := 3004.5
	allowedDeviation := 10.0

	if assert.InDelta(reporter, targetRPM, measuredRPM, allowedDeviation, "rpm should be within allowed deviation") {
		fmt.Println("Measured RPM verified within allowed deviation.")
	}

	if !reporter.failed {
		fmt.Println("All InDelta demonstrations completed successfully.")
	}
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/stretchr/testify/assert.InDelta in pkg:golang/github.com/stretchr/testify@v1.8.1",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/stretchr/testify@v1.8.1"
  ],
  "symbols": [
    "github.com/stretchr/testify/assert.InDelta"
  ]
}

package main

import (
	"fmt"
	"math"
	"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.InDelta returns true and does not record an error when the difference between expected and actual is within delta
	{
		t := &contractTestingT{}
		expected := 10.0
		actual := 10.05
		delta := 0.1
		if !assert.InDelta(t, expected, actual, delta) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 1 failed: InDelta should succeed when difference is within delta\n")
			os.Exit(1)
		}
	}

	// Assertion 2: assert.InDelta returns true when the difference between expected and actual is exactly equal to delta
	{
		t := &contractTestingT{}
		expected := 10.0
		actual := 12.0
		delta := 2.0
		if !assert.InDelta(t, expected, actual, delta) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 2 failed: InDelta should succeed when difference equals delta\n")
			os.Exit(1)
		}
	}

	// Assertion 3: assert.InDelta returns false and records an error when the difference between expected and actual exceeds delta
	{
		t := &contractTestingT{}
		expected := 1.0
		actual := 1.25
		delta := 0.1
		if assert.InDelta(t, expected, actual, delta) || !t.failed || len(t.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 3 failed: InDelta should return false when difference exceeds delta\n")
			os.Exit(1)
		}
	}

	// Assertion 4: assert.InDelta converts different numeric types to float64 for comparison
	{
		t := &contractTestingT{}
		expectedInt := 5
		actualFloat := 5.02
		delta := 0.05
		if !assert.InDelta(t, expectedInt, actualFloat, delta) || t.failed || len(t.errors) != 0 {
			fmt.Fprintf(os.Stderr, "assertion 4 failed: InDelta should succeed comparing mixed int and float types\n")
			os.Exit(1)
		}
	}

	// Assertion 5: assert.InDelta returns false and records an error when a parameter is non-numeric or NaN
	{
		tNonNumeric := &contractTestingT{}
		if assert.InDelta(tNonNumeric, "not-a-number", 1.0, 0.1) || !tNonNumeric.failed || len(tNonNumeric.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: InDelta should fail on non-numeric parameter\n")
			os.Exit(1)
		}

		tNaN := &contractTestingT{}
		if assert.InDelta(tNaN, math.NaN(), 1.0, 0.1) || !tNaN.failed || len(tNaN.errors) == 0 {
			fmt.Fprintf(os.Stderr, "assertion 5 failed: InDelta should fail when expected is NaN\n")
			os.Exit(1)
		}
	}

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