feat(releaser): initial release v0.4.0

Complete GitFlow release automation tool for Conventional Commits workflows:

- Core pipeline: branch parsing, tag discovery, commit analysis, version bump
- Maven pom.xml read/write, git commit/tag, HTTPS push with token auth
- GitLab release creation via API with auto-generated release notes
- Configurable via .releaser.yml (tag_prefix, branch_pattern, commit_message, pom_path, gitlab)
- CLI flags: --dry-run, --no-push, --no-commit, --tag-only, --branch, --pom, --tag-prefix, --branch-pattern
- Dockerfile (multi-stage Alpine), .releaser.gitlab-ci.yml reusable template
- Gitea CI (vet + staticcheck + test + build) and release (5-platform cross-compilation) workflows
- Taskfile with build/test/cov/lint/fuzz/ci/docker tasks
- 96% test coverage with real in-memory git repos and fuzz tests for all parsers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/config/config_test.go

@@ -0,0 +1,144 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadDefaults(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.Git.TagPrefix != "v" {
+		t.Errorf("TagPrefix = %q, want %q", cfg.Git.TagPrefix, "v")
+	}
+	if cfg.Maven.PomPath != "pom.xml" {
+		t.Errorf("PomPath = %q, want %q", cfg.Maven.PomPath, "pom.xml")
+	}
+}
+
+func TestLoadOverride(t *testing.T) {
+	dir := t.TempDir()
+	content := `
+git:
+  tag_prefix: ""
+  commit_message: "release: {version}"
+maven:
+  pom_path: "services/api/pom.xml"
+`
+	if err := os.WriteFile(filepath.Join(dir, filename), []byte(content), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	cfg, err := Load(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.Git.TagPrefix != "" {
+		t.Errorf("TagPrefix = %q, want %q", cfg.Git.TagPrefix, "")
+	}
+	if cfg.Git.CommitMessage != "release: {version}" {
+		t.Errorf("CommitMessage = %q", cfg.Git.CommitMessage)
+	}
+	if cfg.Maven.PomPath != "services/api/pom.xml" {
+		t.Errorf("PomPath = %q", cfg.Maven.PomPath)
+	}
+}
+
+func TestLoadReadError(t *testing.T) {
+	dir := t.TempDir()
+	// Create a directory named .releaser.yml so os.ReadFile fails (is a directory)
+	if err := os.Mkdir(filepath.Join(dir, filename), 0755); err != nil {
+		t.Fatal(err)
+	}
+	_, err := Load(dir)
+	if err == nil {
+		t.Error("expected error when .releaser.yml is a directory")
+	}
+}
+
+func TestLoadInvalidYAML(t *testing.T) {
+	dir := t.TempDir()
+	if err := os.WriteFile(filepath.Join(dir, filename), []byte("{[invalid yaml"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	_, err := Load(dir)
+	if err == nil {
+		t.Error("expected error for invalid YAML")
+	}
+}
+
+func TestApplyEnv(t *testing.T) {
+	t.Setenv("GITLAB_TOKEN", "mytoken")
+	t.Setenv("CI_SERVER_URL", "https://gitlab.example.com")
+	t.Setenv("CI_PROJECT_ID", "42")
+
+	cfg := defaults()
+	cfg.ApplyEnv()
+
+	if cfg.GitLab.Token != "mytoken" {
+		t.Errorf("Token = %q, want mytoken", cfg.GitLab.Token)
+	}
+	if cfg.GitLab.URL != "https://gitlab.example.com" {
+		t.Errorf("URL = %q", cfg.GitLab.URL)
+	}
+	if cfg.GitLab.Project != "42" {
+		t.Errorf("Project = %q, want 42", cfg.GitLab.Project)
+	}
+}
+
+func TestApplyEnvDoesNotOverwrite(t *testing.T) {
+	t.Setenv("GITLAB_TOKEN", "env-token")
+	t.Setenv("CI_SERVER_URL", "https://env.example.com")
+	t.Setenv("CI_PROJECT_ID", "99")
+
+	cfg := defaults()
+	cfg.GitLab.Token = "config-token"
+	cfg.GitLab.URL = "https://config.example.com"
+	cfg.GitLab.Project = "config-project"
+	cfg.ApplyEnv()
+
+	if cfg.GitLab.Token != "config-token" {
+		t.Errorf("Token overwritten: got %q", cfg.GitLab.Token)
+	}
+	if cfg.GitLab.URL != "https://config.example.com" {
+		t.Errorf("URL overwritten: got %q", cfg.GitLab.URL)
+	}
+	if cfg.GitLab.Project != "config-project" {
+		t.Errorf("Project overwritten: got %q", cfg.GitLab.Project)
+	}
+}
+
+func TestApplyEnvProjectPathFallback(t *testing.T) {
+	t.Setenv("CI_PROJECT_ID", "")
+	t.Setenv("CI_PROJECT_PATH", "mygroup/myapp")
+
+	cfg := defaults()
+	cfg.ApplyEnv()
+
+	if cfg.GitLab.Project != "mygroup/myapp" {
+		t.Errorf("Project = %q, want mygroup/myapp (from CI_PROJECT_PATH)", cfg.GitLab.Project)
+	}
+}
+
+func TestLoadPartialOverride(t *testing.T) {
+	dir := t.TempDir()
+	// Only override tag_prefix — commit_message should keep its default
+	content := "git:\n  tag_prefix: \"\"\n"
+	if err := os.WriteFile(filepath.Join(dir, filename), []byte(content), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	cfg, err := Load(dir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if cfg.Git.TagPrefix != "" {
+		t.Errorf("TagPrefix = %q, want %q", cfg.Git.TagPrefix, "")
+	}
+	if cfg.Git.CommitMessage != defaults().Git.CommitMessage {
+		t.Errorf("CommitMessage = %q, want default", cfg.Git.CommitMessage)
+	}
+}