golang.org/x/term v0.0.0-20210927222741-03fcf44c2211: GetSize

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 term.GetSize in pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211
Demonstrate these symbols/APIs:
  - term.GetSize

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.

package sample_test

import (
	"os"
	"testing"

	"golang.org/x/term"
)

func TestGetSizeInvalidFd(t *testing.T) {
	// 1. Invalid file descriptor (-1) returns an error
	w, h, err := term.GetSize(-1)
	if err == nil {
		t.Fatalf("expected error for invalid fd -1, got w=%d h=%d", w, h)
	}
}

func TestGetSizePipe(t *testing.T) {
	// 2. Non-terminal pipe file descriptor returns an error
	r, w, err := os.Pipe()
	if err != nil {
		t.Fatalf("failed to create pipe: %v", err)
	}
	defer r.Close()
	defer w.Close()

	if _, _, err := term.GetSize(int(r.Fd())); err == nil {
		t.Fatal("expected error calling GetSize on pipe reader")
	}
	if _, _, err := term.GetSize(int(w.Fd())); err == nil {
		t.Fatal("expected error calling GetSize on pipe writer")
	}
}

func TestGetSizeRegularFile(t *testing.T) {
	// 3. Regular file descriptor returns an error
	f, err := os.CreateTemp("", "term-test-*")
	if err != nil {
		t.Fatalf("failed to create temp file: %v", err)
	}
	defer os.Remove(f.Name())
	defer f.Close()

	if _, _, err := term.GetSize(int(f.Fd())); err == nil {
		t.Fatal("expected error calling GetSize on regular file")
	}
}

func TestGetSizeDevNull(t *testing.T) {
	// 4. /dev/null device descriptor returns an error
	devNull, err := os.Open(os.DevNull)
	if err != nil {
		t.Fatalf("failed to open /dev/null: %v", err)
	}
	defer devNull.Close()

	if _, _, err := term.GetSize(int(devNull.Fd())); err == nil {
		t.Fatal("expected error calling GetSize on /dev/null")
	}
}

{"case":{"caseId":"case:sha256:321f9479babfb60d9bd09fdd666564146cf6bcd5076c0db0261d8ebd778339fb","contract":["term.GetSize returns an error for negative or invalid file descriptors","term.GetSize returns an error for pipe file descriptors","term.GetSize returns an error for regular file descriptors","term.GetSize returns an error for /dev/null device descriptors"],"goal":"verify term.GetSize in pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211","kind":"HOW","packages":["pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211"],"schemaVersion":1,"symbols":["term.GetSize"]},"contractCommand":["go","test","-v","./..."],"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/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211","symbols":["term.GetSize"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require golang.org/x/term v0.0.0-20210927222741-03fcf44c2211

require golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect

golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=

{
  "schemaVersion": 1,
  "goal": "verify term.GetSize in pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/term@v0.0.0-20210927222741-03fcf44c2211"
  ],
  "symbols": [
    "term.GetSize"
  ]
}