github.com/Masterminds/semver/v3 v3.3.0: Collection

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/Masterminds/semver/v3.Collection in pkg:golang/github.com/Masterminds/semver/v3@v3.3.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/Masterminds/semver/v3@v3.3.0
Demonstrate these symbols/APIs:
  - github.com/Masterminds/semver/v3.Collection

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:f3cc15f56b2969a473e9ee821e59078adcedb648504f2808f62ad2df1a612904","contract":["semver.Collection implements sort.Interface with Len, Less, and Swap methods","semver.Collection.Len returns the total number of versions in the collection","semver.Collection.Less accurately compares versions including prerelease precedence","semver.Collection.Swap correctly interchanges elements at specified indices","sort.Sort on semver.Collection sorts version instances in ascending semantic version order"],"goal":"verify github.com/Masterminds/semver/v3.Collection in pkg:golang/github.com/Masterminds/semver/v3@v3.3.0","kind":"HOW","packages":["pkg:golang/github.com/Masterminds/semver/v3@v3.3.0"],"schemaVersion":1,"symbols":["github.com/Masterminds/semver/v3.Collection"]},"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/Masterminds/semver/v3@v3.3.0"],"schemaVersion":1,"subject":"pkg:golang/github.com/Masterminds/semver/v3@v3.3.0","symbols":["github.com/Masterminds/semver/v3.Collection"],"verifierAdapter":"golang@1"}

module example.com/sample

go 1.21

require github.com/Masterminds/semver/v3 v3.3.0

github.com/Masterminds/semver/v3 v3.3.0 h1:B8LGeaivUe71a5qox1ICM/JLl0NqZSW5CHyL+hmvYS0=
github.com/Masterminds/semver/v3 v3.3.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=

package main

import (
	"fmt"
	"sort"

	"github.com/Masterminds/semver/v3"
)

func main() {
	rawVersions := []string{
		"2.1.0",
		"1.0.0-alpha",
		"1.2.3",
		"1.0.0",
		"2.1.0-beta",
	}

	vs := make([]*semver.Version, len(rawVersions))
	for i, raw := range rawVersions {
		v, err := semver.NewVersion(raw)
		if err != nil {
			panic(err)
		}
		vs[i] = v
	}

	collection := semver.Collection(vs)
	fmt.Println("Original collection:")
	for _, v := range collection {
		fmt.Printf("  %s\n", v.String())
	}

	sort.Sort(collection)

	fmt.Println("\nSorted collection:")
	for _, v := range collection {
		fmt.Printf("  %s\n", v.String())
	}
}

{
  "schemaVersion": 1,
  "goal": "verify github.com/Masterminds/semver/v3.Collection in pkg:golang/github.com/Masterminds/semver/v3@v3.3.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/Masterminds/semver/v3@v3.3.0"
  ],
  "symbols": [
    "github.com/Masterminds/semver/v3.Collection"
  ]
}

package main

import (
	"fmt"
	"os"
	"reflect"
	"sort"

	"github.com/Masterminds/semver/v3"
)

func main() {
	// Assertion 1: semver.Collection implements sort.Interface with Len, Less, and Swap methods
	var _ sort.Interface = semver.Collection{}

	// Assertion 2: semver.Collection.Len returns the total number of versions in the collection
	emptyCol := semver.Collection{}
	if emptyCol.Len() != 0 {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected empty collection Len == 0, got %d\n", emptyCol.Len())
		os.Exit(1)
	}

	rawVersions := []string{
		"1.2.3",
		"1.0.0",
		"2.1.0-beta",
		"1.0.0-alpha",
		"2.1.0",
		"1.0.0-alpha.1",
		"0.9.0",
	}

	vs := make([]*semver.Version, len(rawVersions))
	for i, raw := range rawVersions {
		v, err := semver.NewVersion(raw)
		if err != nil {
			fmt.Fprintf(os.Stderr, "failed to parse version %q: %v\n", raw, err)
			os.Exit(1)
		}
		vs[i] = v
	}

	col := semver.Collection(vs)
	if col.Len() != len(rawVersions) {
		fmt.Fprintf(os.Stderr, "assertion 2 failed: expected Len == %d, got %d\n", len(rawVersions), col.Len())
		os.Exit(1)
	}

	// Assertion 3: semver.Collection.Less accurately compares versions including prerelease precedence
	// In col:
	// index 3 is 1.0.0-alpha
	// index 1 is 1.0.0
	// By semver precedence, 1.0.0-alpha < 1.0.0
	if !col.Less(3, 1) {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected col[3] (1.0.0-alpha) < col[1] (1.0.0)\n")
		os.Exit(1)
	}
	if col.Less(1, 3) {
		fmt.Fprintf(os.Stderr, "assertion 3 failed: expected col[1] (1.0.0) not < col[3] (1.0.0-alpha)\n")
		os.Exit(1)
	}

	// Assertion 4: semver.Collection.Swap correctly interchanges elements at specified indices
	v0Before := col[0]
	v1Before := col[1]
	col.Swap(0, 1)
	if col[0] != v1Before || col[1] != v0Before {
		fmt.Fprintf(os.Stderr, "assertion 4 failed: swap did not interchange elements correctly\n")
		os.Exit(1)
	}
	col.Swap(0, 1) // restore original order before sort

	// Assertion 5: sort.Sort on semver.Collection sorts version instances in ascending semantic version order
	sort.Sort(col)

	expectedOrder := []string{
		"0.9.0",
		"1.0.0-alpha",
		"1.0.0-alpha.1",
		"1.0.0",
		"1.2.3",
		"2.1.0-beta",
		"2.1.0",
	}

	actualOrder := make([]string, len(col))
	for i, v := range col {
		actualOrder[i] = v.String()
	}

	if !reflect.DeepEqual(actualOrder, expectedOrder) {
		fmt.Fprintf(os.Stderr, "assertion 5 failed: expected order %v, got %v\n", expectedOrder, actualOrder)
		os.Exit(1)
	}

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