Add test for generate command

internal/pkg/conflictless/cli.go

@@ -42,7 +42,7 @@ func CLI() {
 	case commandCheck:
 		check(&cfg)
 	case commandGen:
-		generate(&cfg)
+		Generate(&cfg)
 	case commandHelp:
 		help()
 	default:

internal/pkg/conflictless/generate.go

@@ -8,7 +8,8 @@ import (
 	"github.com/ypjama/conflictless-keepachangelog/pkg/schema"
 )
 
-func generate(cfg *Config) {
+// Generate generates a new version section in the changelog.
+func Generate(cfg *Config) {
 	err := cfg.setBumpFromFlags()
 	if err != nil {
 		printErrorAndExit(err.Error(), usageGenerate)

internal/pkg/conflictless/generate_test.go

@@ -0,0 +1,84 @@
+package conflictless_test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/ypjama/conflictless-keepachangelog/internal/pkg/conflictless"
+)
+
+const (
+	mkdirFileMode = 0o755
+	writeFileMode = 0o644
+)
+
+func writeDataToFile(t *testing.T, data []byte, file *os.File) {
+	t.Helper()
+
+	err := os.WriteFile(file.Name(), data, writeFileMode)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func createFile(t *testing.T, dir, name string) *os.File {
+	t.Helper()
+
+	file, err := os.Create(dir + "/" + name)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return file
+}
+
+func createTempFile(t *testing.T, dir, pattern string) *os.File {
+	t.Helper()
+
+	file, err := os.CreateTemp(dir, pattern)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return file
+}
+
+func TestGenerate(t *testing.T) {
+	t.Parallel()
+
+	changesDir, err := os.MkdirTemp(os.TempDir(), "changes")
+	assert.NoError(t, err)
+
+	defer os.RemoveAll(changesDir)
+
+	os.TempDir()
+
+	changesFile := createFile(t, changesDir, "1-foo.json")
+	defer os.Remove(changesFile.Name())
+
+	changelogFile := createTempFile(t, os.TempDir(), "CHANGELOG.md")
+	defer os.Remove(changelogFile.Name())
+
+	gitConfigFile := createTempFile(t, os.TempDir(), ".gitconfig")
+	defer os.Remove(gitConfigFile.Name())
+
+	writeDataToFile(t, []byte(`{"fixed":["foo"]}`), changesFile)
+	writeDataToFile(t, []byte(changelogContent), changelogFile)
+	writeDataToFile(t, []byte(gitConfig), gitConfigFile)
+
+	flagValueBumpPatch := "patch"
+
+	cfg := new(conflictless.Config)
+	cfg.Flags.Directory = &changesDir
+	cfg.Flags.Bump = &flagValueBumpPatch
+	cfg.ChangelogFile = changelogFile.Name()
+	cfg.RepositoryConfigFile = gitConfigFile.Name()
+
+	conflictless.Generate(cfg)
+
+	actual, err := os.ReadFile(changelogFile.Name())
+	assert.NoError(t, err)
+	assert.Contains(t, string(actual), "## [Unreleased]")
+	assert.Contains(t, string(actual), "## [1.0.2]")
+}

internal/pkg/conflictless/parse_test.go

@@ -9,10 +9,8 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestDetectRepositoryURL(t *testing.T) {
-	t.Parallel()
-
-	gitConfig := `[core]
+const (
+	gitConfig = `[core]
         repositoryformatversion = 0
         filemode = true
         bare = false
@@ -26,6 +24,10 @@ func TestDetectRepositoryURL(t *testing.T) {
 [user]
         name = foobar
         email = foobar@localhost`
+)
+
+func TestDetectRepositoryURL(t *testing.T) {
+	t.Parallel()
 
 	file, err := os.CreateTemp(os.TempDir(), "gitconfig")
 	assert.NoError(t, err)