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/maven/maven_test.go

@@ -0,0 +1,213 @@
+package maven
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+const simplePom = `<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.example</groupId>
+    <artifactId>myapp</artifactId>
+    <version>1.2.3</version>
+    <name>My App</name>
+</project>`
+
+const pomWithParent = `<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.2.0</version>
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>myapp</artifactId>
+    <version>1.2.3</version>
+</project>`
+
+const pomWithSnapshot = `<?xml version="1.0" encoding="UTF-8"?>
+<project>
+    <artifactId>myapp</artifactId>
+    <version>1.2.4-SNAPSHOT</version>
+</project>`
+
+func writePom(t *testing.T, content string) string {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "pom.xml")
+	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
+		t.Fatal(err)
+	}
+	return path
+}
+
+func TestReadVersion(t *testing.T) {
+	cases := []struct {
+		name    string
+		content string
+		want    string
+	}{
+		{"simple pom", simplePom, "1.2.3"},
+		{"pom with parent", pomWithParent, "1.2.3"},
+		{"snapshot version", pomWithSnapshot, "1.2.4-SNAPSHOT"},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			got, err := ReadVersion(writePom(t, c.content))
+			if err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+			if got != c.want {
+				t.Errorf("got %q, want %q", got, c.want)
+			}
+		})
+	}
+}
+
+func TestReadVersionParentNotMatched(t *testing.T) {
+	// ReadVersion must return the project version, NOT the parent version (3.2.0).
+	got, err := ReadVersion(writePom(t, pomWithParent))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "1.2.3" {
+		t.Errorf("got %q, want 1.2.3 (parent version must be ignored)", got)
+	}
+}
+
+func TestWriteVersion(t *testing.T) {
+	cases := []struct {
+		name       string
+		content    string
+		oldVersion string
+		newVersion string
+		wantInFile string
+	}{
+		{"simple replace", simplePom, "1.2.3", "1.2.4", "<version>1.2.4</version>"},
+		{"with parent", pomWithParent, "1.2.3", "1.2.4", "<version>1.2.4</version>"},
+		{"snapshot to release", pomWithSnapshot, "1.2.4-SNAPSHOT", "1.2.4", "<version>1.2.4</version>"},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			path := writePom(t, c.content)
+			if err := WriteVersion(path, c.oldVersion, c.newVersion); err != nil {
+				t.Fatalf("unexpected error: %v", err)
+			}
+
+			data, _ := os.ReadFile(path)
+			content := string(data)
+
+			if !contains(content, c.wantInFile) {
+				t.Errorf("expected %q in updated pom, got:\n%s", c.wantInFile, content)
+			}
+
+			// Parent version must be unchanged in the parent block case.
+			if c.name == "with parent" && !contains(content, "<version>3.2.0</version>") {
+				t.Error("parent version was modified")
+			}
+		})
+	}
+}
+
+func TestWriteVersionParentPreserved(t *testing.T) {
+	path := writePom(t, pomWithParent)
+	if err := WriteVersion(path, "1.2.3", "1.2.4"); err != nil {
+		t.Fatal(err)
+	}
+	got, _ := ReadVersion(path)
+	if got != "1.2.4" {
+		t.Errorf("project version = %q, want 1.2.4", got)
+	}
+
+	data, _ := os.ReadFile(path)
+	if !contains(string(data), "<version>3.2.0</version>") {
+		t.Error("parent version was modified")
+	}
+}
+
+func TestReadVersionMissingFile(t *testing.T) {
+	_, err := ReadVersion(filepath.Join(t.TempDir(), "nonexistent.xml"))
+	if err == nil {
+		t.Error("expected error for missing pom file")
+	}
+}
+
+func TestReadVersionNoVersionTag(t *testing.T) {
+	_, err := ReadVersion(writePom(t, "<project><artifactId>app</artifactId></project>"))
+	if err == nil {
+		t.Error("expected error when no <version> tag present")
+	}
+}
+
+func TestWriteVersionMissingFile(t *testing.T) {
+	err := WriteVersion(filepath.Join(t.TempDir(), "nosuchfile.xml"), "1.0", "1.1")
+	if err == nil {
+		t.Error("expected error for missing pom file")
+	}
+}
+
+func TestWriteVersionNotFound(t *testing.T) {
+	err := WriteVersion(writePom(t, simplePom), "9.9.9", "9.9.10")
+	if err == nil {
+		t.Error("expected error when old version not found in pom")
+	}
+}
+
+func TestReplaceVersionParentNoMatch(t *testing.T) {
+	// Has </parent> but the target version only appears inside the parent block,
+	// not after it. replaceProjectVersion should return content unchanged.
+	content := `<project><parent><version>3.0.0</version></parent></project>`
+	result := replaceProjectVersion(content, "3.0.0", "4.0.0")
+	if result != content {
+		t.Errorf("expected content unchanged; got:\n%s", result)
+	}
+}
+
+func contains(s, sub string) bool { return strings.Contains(s, sub) }
+
+// FuzzReadVersion verifies that ReadVersion never panics on arbitrary file content.
+func FuzzReadVersion(f *testing.F) {
+	f.Add(simplePom)
+	f.Add(pomWithParent)
+	f.Add(pomWithSnapshot)
+	f.Add("")
+	f.Add("<project></project>")
+	f.Add("<version>1.0</version>")
+	f.Add("\x00\x01\xff")
+
+	f.Fuzz(func(t *testing.T, content string) {
+		path := filepath.Join(t.TempDir(), "pom.xml")
+		os.WriteFile(path, []byte(content), 0644) //nolint:errcheck
+		// Must not panic regardless of content
+		ReadVersion(path) //nolint:errcheck
+	})
+}
+
+// FuzzReplaceProjectVersion verifies the internal replacer is robust against arbitrary inputs.
+func FuzzReplaceProjectVersion(f *testing.F) {
+	f.Add(simplePom, "1.2.3", "1.2.4")
+	f.Add(pomWithParent, "1.2.3", "2.0.0")
+	f.Add("", "1.0", "2.0")
+	f.Add("<version>1.0</version>", "1.0", "1.1")
+	f.Add("\x00", "", "1.0")
+
+	f.Fuzz(func(t *testing.T, content, oldVersion, newVersion string) {
+		result := replaceProjectVersion(content, oldVersion, newVersion)
+		// Result must always be a string (no panic)
+		// If a replacement happened, oldVersion must not appear where newVersion was inserted
+		if oldVersion == newVersion {
+			return
+		}
+		if result != content {
+			// Replacement occurred — newVersion must appear in result
+			if !strings.Contains(result, "<version>"+newVersion+"</version>") {
+				t.Errorf("replacement happened but newVersion not found in result")
+			}
+		}
+	})
+}