github.com/hashicorp/go-version v1.2.0: version.NewConstraint

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 version.NewConstraint in pkg:golang/github.com/hashicorp/go-version@v1.2.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/hashicorp/go-version@v1.2.0
Demonstrate these symbols/APIs:
  - version.NewConstraint

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:sha256:2264c08c6bcdefb058899b8cbef9fc4f7e033639e05b69913f672e1a046795ad","contract":["version.NewConstraint(\"\u003e= 1.0, \u003c 1.4\") parses comma-separated version constraints without error","Constraints.Check returns true for version 1.2.0 and false for version 1.5.0 against \"\u003e= 1.0, \u003c 1.4\"","version.NewConstraint returns a non-nil error when given an invalid constraint string"],"goal":"verify version.NewConstraint in pkg:golang/github.com/hashicorp/go-version@v1.2.0","kind":"HOW","packages":["pkg:golang/github.com/hashicorp/go-version@v1.2.0"],"schemaVersion":1,"symbols":["version.NewConstraint"]},"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/hashicorp/go-version@v1.2.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/hashicorp/go-version@v1.2.0","symbols":["version.NewConstraint"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require github.com/hashicorp/go-version v1.2.0

github.com/hashicorp/go-version v1.2.0 h1:3vNe/fWF5CBgRIguda1meWhsZHy3m8gCJ5wx+dIzX/E=
github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=

{
  "schemaVersion": 1,
  "goal": "verify version.NewConstraint in pkg:golang/github.com/hashicorp/go-version@v1.2.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/hashicorp/go-version@v1.2.0"
  ],
  "symbols": [
    "version.NewConstraint"
  ]
}

package main

import (
	"fmt"
	"os"

	version "github.com/hashicorp/go-version"
)

func main() {
	constraints, err := version.NewConstraint(">= 1.0, < 1.4")
	if err != nil {
		fmt.Fprintf(os.Stderr, "expected valid constraint, got error: %v\n", err)
		os.Exit(1)
	}

	v12, err := version.NewVersion("1.2.0")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected version parse error: %v\n", err)
		os.Exit(1)
	}
	if !constraints.Check(v12) {
		fmt.Fprintf(os.Stderr, "expected 1.2.0 to satisfy constraint %s\n", constraints)
		os.Exit(1)
	}

	v15, err := version.NewVersion("1.5.0")
	if err != nil {
		fmt.Fprintf(os.Stderr, "unexpected version parse error: %v\n", err)
		os.Exit(1)
	}
	if constraints.Check(v15) {
		fmt.Fprintf(os.Stderr, "expected 1.5.0 to fail constraint %s\n", constraints)
		os.Exit(1)
	}

	if _, err := version.NewConstraint("invalid constraint"); err == nil {
		fmt.Fprintln(os.Stderr, "expected error for malformed constraint string")
		os.Exit(1)
	}
}