golang.org/x/tools v0.46.0: imports.Process

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 pkg:golang/golang.org/x/tools@v0.46.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/golang.org/x/tools@v0.46.0

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.

{"buildCommand":["go","build","-ldflags=-w -s","-o","testbin","./test"],"case":{"caseId":"case:sha256:305eeb94ab88b310c8772c846f8bdce30c58689446ab2cf6a7b4019cd77ad6a5","contract":["imports.Process automatically inserts missing standard library imports for referenced symbols","imports.Process automatically removes unused imports from Go source code","imports.Process formats and canonicalizes Go source code when nil Options is provided","imports.Process with Options.FormatOnly true formats source code without adding or removing imports","imports.Process with Options.Fragment true processes declaration fragments without a package clause","imports.Process returns an error when given invalid Go syntax that cannot be parsed"],"goal":"verify pkg:golang/golang.org/x/tools@v0.46.0","kind":"HOW","packages":["pkg:golang/golang.org/x/tools@v0.46.0"],"schemaVersion":1,"symbols":["golang.org/x/tools/imports.Process"]},"contractCommand":["./testbin"],"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/golang.org/x/tools@v0.46.0"],"schemaVersion":1,"subject":"pkg:golang/golang.org/x/tools@v0.46.0","symbols":["golang.org/x/tools/imports.Process"],"verifierAdapter":"golang@1"}

module sample

go 1.26.6

require golang.org/x/tools v0.46.0

require (
	golang.org/x/mod v0.37.0 // indirect
	golang.org/x/sync v0.21.0 // indirect
)

github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
golang.org/x/tools v0.46.0 h1:7jTurBkPZu4moS/Uy4OQT1M+QBlsj3wejyZwsT8Z7rk=
golang.org/x/tools v0.46.0/go.mod h1:FrD85F8l+NWL+9XWBSyVSHO6Ne4jutsfIFba7AWQ5Ys=

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/golang.org/x/tools@v0.46.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/golang.org/x/tools@v0.46.0"
  ]
}

package main

import (
	"fmt"
	"os"
	"strings"

	"golang.org/x/tools/imports"
)

func main() {
	if err := verifyContract(); err != nil {
		fmt.Fprintf(os.Stderr, "Contract verification failed: %v\n", err)
		os.Exit(1)
	}
	fmt.Println("All contract assertions passed.")
}

func verifyContract() error {
	// 1. imports.Process automatically inserts missing standard library imports for referenced symbols
	{
		src := []byte("package main\n\nfunc main() {\n\tfmt.Println(\"hello\")\n}\n")
		res, err := imports.Process("main.go", src, nil)
		if err != nil {
			return fmt.Errorf("assertion 1 failed: %w", err)
		}
		out := string(res)
		if !strings.Contains(out, `"fmt"`) {
			return fmt.Errorf("assertion 1: expected fmt import to be added, got:\n%s", out)
		}
	}

	// 2. imports.Process automatically removes unused imports from Go source code
	{
		src := []byte("package main\n\nimport (\n\t\"os\"\n\t\"strings\"\n)\n\nfunc main() {\n\t_ = strings.ToUpper(\"abc\")\n}\n")
		res, err := imports.Process("main.go", src, nil)
		if err != nil {
			return fmt.Errorf("assertion 2 failed: %w", err)
		}
		out := string(res)
		if strings.Contains(out, `"os"`) {
			return fmt.Errorf("assertion 2: expected unused os import to be removed, got:\n%s", out)
		}
		if !strings.Contains(out, `"strings"`) {
			return fmt.Errorf("assertion 2: expected used strings import to remain, got:\n%s", out)
		}
	}

	// 3. imports.Process formats and canonicalizes Go source code when nil Options is provided
	{
		src := []byte("package main\n\nfunc  compute( x,y  int )int{return   x+y}\n")
		res, err := imports.Process("main.go", src, nil)
		if err != nil {
			return fmt.Errorf("assertion 3 failed: %w", err)
		}
		expected := "package main\n\nfunc compute(x, y int) int { return x + y }\n"
		if string(res) != expected {
			return fmt.Errorf("assertion 3: expected %q, got %q", expected, string(res))
		}
	}

	// 4. imports.Process with Options.FormatOnly true formats source code without adding or removing imports
	{
		src := []byte("package main\n\nimport \"os\"\n\nfunc  main() {\n\tfmt.Println( \"unimported\" )\n}\n")
		opt := &imports.Options{
			FormatOnly: true,
			Comments:   true,
			TabIndent:  true,
			TabWidth:   8,
		}
		res, err := imports.Process("main.go", src, opt)
		if err != nil {
			return fmt.Errorf("assertion 4 failed: %w", err)
		}
		out := string(res)
		if !strings.Contains(out, `import "os"`) {
			return fmt.Errorf("assertion 4: expected unused os import to remain when FormatOnly is true, got:\n%s", out)
		}
		if strings.Contains(out, `"fmt"`) {
			return fmt.Errorf("assertion 4: expected missing fmt import not to be added when FormatOnly is true, got:\n%s", out)
		}
		if !strings.Contains(out, `fmt.Println("unimported")`) {
			return fmt.Errorf("assertion 4: expected code formatting to be applied, got:\n%s", out)
		}
	}

	// 5. imports.Process with Options.Fragment true processes declaration fragments without a package clause
	{
		src := []byte("func helper() {\nfmt.Println(\"fragment\")\n}\n")
		opt := &imports.Options{
			Fragment:  true,
			Comments:  true,
			TabIndent: true,
			TabWidth:  8,
		}
		res, err := imports.Process("fragment.go", src, opt)
		if err != nil {
			return fmt.Errorf("assertion 5 failed: %w", err)
		}
		out := string(res)
		if !strings.Contains(out, `import "fmt"`) {
			return fmt.Errorf("assertion 5: expected fmt import for fragment, got:\n%s", out)
		}
		if !strings.Contains(out, "func helper() {\n\tfmt.Println(\"fragment\")\n}") {
			return fmt.Errorf("assertion 5: unexpected formatted fragment:\n%s", out)
		}
	}

	// 6. imports.Process returns an error when given invalid Go syntax that cannot be parsed
	{
		src := []byte("package main\n\nfunc broken( {\n")
		_, err := imports.Process("broken.go", src, nil)
		if err == nil {
			return fmt.Errorf("assertion 6: expected syntax error for invalid Go code, got nil")
		}
	}

	return nil
}