vociferate/cmd/vociferate/main_test.go

package main

import (
	"flag"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

func TestMainRecommendPrintsTag(t *testing.T) {
	root := t.TempDir()
	writeFile(t, filepath.Join(root, "release-version"), "1.1.6\n")
	writeFile(t, filepath.Join(root, "CHANGELOG.md"), "# Changelog\n\n## [Unreleased]\n\n### Added\n\n- Feature.\n\n## [1.1.6] - 2017-12-20\n")

	stdout, stderr, code := runMain(t, "--recommend", "--root", root)
	if code != 0 {
		t.Fatalf("expected exit 0, got %d (stderr: %s)", code, stderr)
	}
	if strings.TrimSpace(stdout) != "v1.2.0" {
		t.Fatalf("unexpected recommended tag: %q", strings.TrimSpace(stdout))
	}
}

func TestMainPrintUnreleasedWritesPendingNotes(t *testing.T) {
	root := t.TempDir()
	writeFile(t, filepath.Join(root, "CHANGELOG.md"), "# Changelog\n\n## [Unreleased]\n\n### Added\n\n- Feature.\n\n### Fixed\n\n- Bugfix.\n\n## [1.1.6] - 2017-12-20\n")

	stdout, stderr, code := runMain(t, "--print-unreleased", "--root", root)
	if code != 0 {
		t.Fatalf("expected exit 0, got %d (stderr: %s)", code, stderr)
	}
	if stdout != "### Added\n\n- Feature.\n\n### Fixed\n\n- Bugfix.\n" {
		t.Fatalf("unexpected unreleased output: %q", stdout)
	}
}

func TestMainPrintReleaseNotesWritesTaggedSection(t *testing.T) {
	root := t.TempDir()
	writeFile(t, filepath.Join(root, "CHANGELOG.md"), "# Changelog\n\n## [Unreleased]\n\n### Added\n\n- Feature.\n\n## [1.1.6] - 2017-12-20\n\n### Fixed\n\n- Historical note.\n")

	stdout, stderr, code := runMain(t, "--print-release-notes", "--version", "1.1.6", "--root", root)
	if code != 0 {
		t.Fatalf("expected exit 0, got %d (stderr: %s)", code, stderr)
	}
	if stdout != "## [1.1.6] - 2017-12-20\n\n### Fixed\n\n- Historical note.\n" {
		t.Fatalf("unexpected release notes output: %q", stdout)
	}
}

func TestMainUsageExitWhenRequiredFlagsMissing(t *testing.T) {
	_, stderr, code := runMain(t)
	if code != 2 {
		t.Fatalf("expected exit 2, got %d", code)
	}
	if !strings.Contains(stderr, "usage: vociferate") {
		t.Fatalf("expected usage text in stderr, got: %s", stderr)
	}
}

func TestMainPrepareUpdatesFiles(t *testing.T) {
	root := t.TempDir()
	writeFile(t, filepath.Join(root, ".git", "config"), "[remote \"origin\"]\n\turl = git@git.hrafn.xyz:aether/vociferate.git\n")
	writeFile(t, filepath.Join(root, "release-version"), "1.1.6\n")
	writeFile(t, filepath.Join(root, "CHANGELOG.md"), "# Changelog\n\n## [Unreleased]\n\n### Fixed\n\n- Patch note.\n\n## [1.1.6] - 2017-12-20\n")

	_, stderr, code := runMain(t, "--version", "v1.1.7", "--date", "2026-03-20", "--root", root)
	if code != 0 {
		t.Fatalf("expected exit 0, got %d (stderr: %s)", code, stderr)
	}

	versionBytes, err := os.ReadFile(filepath.Join(root, "release-version"))
	if err != nil {
		t.Fatalf("read release-version: %v", err)
	}
	if strings.TrimSpace(string(versionBytes)) != "1.1.7" {
		t.Fatalf("unexpected version file value: %q", string(versionBytes))
	}
}

func TestMainPrepareReturnsExitOneOnFailure(t *testing.T) {
	root := t.TempDir()
	_, stderr, code := runMain(t, "--version", "v1.1.7", "--date", "2026-03-20", "--root", root)
	if code != 1 {
		t.Fatalf("expected exit 1, got %d", code)
	}
	if !strings.Contains(stderr, "prepare release") {
		t.Fatalf("expected prepare error in stderr, got: %s", stderr)
	}
}

func TestHelperProcess(t *testing.T) {
	if os.Getenv("GO_WANT_HELPER_PROCESS") != "1" {
		return
	}

	idx := -1
	for i, arg := range os.Args {
		if arg == "--" {
			idx = i
			break
		}
	}
	if idx == -1 {
		os.Exit(2)
	}

	args := append([]string{"vociferate"}, os.Args[idx+1:]...)
	os.Args = args
	flag.CommandLine = flag.NewFlagSet(args[0], flag.ExitOnError)

	main()
	os.Exit(0)
}

func runMain(t *testing.T, args ...string) (string, string, int) {
	t.Helper()

	cmdArgs := append([]string{"-test.run=TestHelperProcess", "--"}, args...)
	cmd := exec.Command(os.Args[0], cmdArgs...)
	cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")

	out, err := cmd.CombinedOutput()
	output := string(out)
	if err == nil {
		return output, "", 0
	}

	if exitErr, ok := err.(*exec.ExitError); ok {
		return "", output, exitErr.ExitCode()
	}

	t.Fatalf("run helper process: %v", err)
	return "", "", -1
}

func writeFile(t *testing.T, path, content string) {
	t.Helper()
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		t.Fatalf("mkdir for %s: %v", path, err)
	}
	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
		t.Fatalf("write file %s: %v", path, err)
	}
}