1 files changed, 186 insertions, 0 deletions
diff --git a/objects_test.go b/objects_test.go
new file mode 100644
index 00000000..b5b3c5b9
--- /dev/null
+++ b/objects_test.go
@@ -0,0 +1,186 @@
+package furgit
+
+import (
+	"bytes"
+	"fmt"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func mustHash(t *testing.T, hex string) Hash {
+	id, err := ParseHash(hex)
+	if err != nil {
+		t.Fatalf("ParseHash failed: %v", err)
+	}
+	return id
+}
+
+func hashWithByte(fill byte) Hash {
+	var h Hash
+	for i := range h {
+		h[i] = fill
+		fill++
+	}
+	return h
+}
+
+func TestLoosePathUsesExpectedLayout(t *testing.T) {
+	id := mustHash(t, "0123456789abcdef0123456789abcdef01234567")
+	expect := filepath.Join("objects", "01", "23456789abcdef0123456789abcdef01234567")
+	if got := loosePath(id); got != expect {
+		t.Fatalf("unexpected loose path: %q", got)
+	}
+}
+
+func TestParseBlobAndSerialize(t *testing.T) {
+	data := []byte("blob payload")
+	id := hashWithByte(0x10)
+	blob, err := parseBlob(id, data)
+	if err != nil {
+		t.Fatalf("parseBlob error: %v", err)
+	}
+	if !bytes.Equal(blob.Data, data) {
+		t.Fatalf("blob data mismatch: %q", blob.Data)
+	}
+	if blob.Hash != id {
+		t.Fatalf("blob hash mismatch: %v", blob.Hash)
+	}
+	raw, err := blob.Serialize()
+	if err != nil {
+		t.Fatalf("Serialize error: %v", err)
+	}
+	header, err := headerForType(ObjBlob, data)
+	if err != nil {
+		t.Fatalf("headerForType: %v", err)
+	}
+	want := append(append([]byte(nil), header...), data...)
+	if !bytes.Equal(raw, want) {
+		t.Fatalf("serialized blob mismatch")
+	}
+}
+
+func TestParseTreeAndSerialize(t *testing.T) {
+	entries := []TreeEntry{
+		{Mode: 0100644, Name: []byte("file.txt"), ID: hashWithByte(0x20)},
+		{Mode: 040000, Name: []byte("subdir"), ID: hashWithByte(0x30)},
+	}
+	body := treeBody(&Tree{Entries: entries})
+	id := hashWithByte(0x40)
+	tree, err := parseTree(id, body)
+	if err != nil {
+		t.Fatalf("parseTree error: %v", err)
+	}
+	if len(tree.Entries) != len(entries) {
+		t.Fatalf("expected %d entries, got %d", len(entries), len(tree.Entries))
+	}
+	for i := range entries {
+		if tree.Entries[i].Mode != entries[i].Mode || !bytes.Equal(tree.Entries[i].Name, entries[i].Name) || tree.Entries[i].ID != entries[i].ID {
+			t.Fatalf("entry %d mismatch", i)
+		}
+	}
+	serialized, err := (&Tree{Entries: entries}).Serialize()
+	if err != nil {
+		t.Fatalf("Serialize error: %v", err)
+	}
+	header, _ := headerForType(ObjTree, body)
+	want := append(append([]byte(nil), header...), body...)
+	if !bytes.Equal(serialized, want) {
+		t.Fatalf("serialized tree mismatch")
+	}
+}
+
+func TestParseCommitWithExtraHeader(t *testing.T) {
+	treeID := hashWithByte(0x50)
+	parent := hashWithByte(0x60)
+	ident := Ident{
+		Name:          []byte("Alice"),
+		Email:         []byte("alice@example.com"),
+		WhenUnix:      1700000000,
+		OffsetMinutes: -420,
+	}
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "tree %s\n", treeID.String())
+	fmt.Fprintf(&buf, "parent %s\n", parent.String())
+	buf.WriteString("author ")
+	buf.Write(ident.Serialize())
+	buf.WriteByte('\n')
+	buf.WriteString("committer ")
+	buf.Write(ident.Serialize())
+	buf.WriteByte('\n')
+	buf.WriteString("extra data\n\nMessage body\n")
+	commit, err := parseCommit(hashWithByte(0x70), buf.Bytes())
+	if err != nil {
+		t.Fatalf("parseCommit error: %v", err)
+	}
+	if commit.Tree != treeID {
+		t.Fatalf("tree mismatch")
+	}
+	if len(commit.Parents) != 1 || commit.Parents[0] != parent {
+		t.Fatalf("parent mismatch: %+v", commit.Parents)
+	}
+	if string(commit.Message) != "Message body\n" {
+		t.Fatalf("message mismatch: %q", commit.Message)
+	}
+	if len(commit.ExtraHeaders) != 1 || commit.ExtraHeaders[0].Key != "extra" || !bytes.Equal(commit.ExtraHeaders[0].Value, []byte("data")) {
+		t.Fatalf("extra headers mismatch: %+v", commit.ExtraHeaders)
+	}
+
+	roundTrip := &Commit{
+		Tree:      treeID,
+		Parents:   []Hash{parent},
+		Author:    ident,
+		Committer: ident,
+		Message:   []byte("Message body\n"),
+	}
+	raw, err := roundTrip.Serialize()
+	if err != nil {
+		t.Fatalf("Serialize error: %v", err)
+	}
+	if !strings.Contains(string(raw), "tree "+treeID.String()) {
+		t.Fatalf("serialized commit missing tree header")
+	}
+}
+
+func TestParseTagAndSerialize(t *testing.T) {
+	target := hashWithByte(0x80)
+	tagger := &Ident{
+		Name:          []byte("Tagger"),
+		Email:         []byte("tagger@example.com"),
+		WhenUnix:      1234,
+		OffsetMinutes: 0,
+	}
+	var buf bytes.Buffer
+	buf.WriteString("object ")
+	buf.WriteString(target.String())
+	buf.WriteByte('\n')
+	buf.WriteString("type commit\n")
+	buf.WriteString("tag v1.0\n")
+	buf.WriteString("tagger ")
+	buf.Write(tagger.Serialize())
+	buf.WriteString("\n\nannotated tag\n")
+	body := append([]byte(nil), buf.Bytes()...)
+	tag, err := parseTag(hashWithByte(0x90), body)
+	if err != nil {
+		t.Fatalf("parseTag error: %v", err)
+	}
+	if tag.Target != target || tag.TargetType != ObjCommit {
+		t.Fatalf("tag target mismatch")
+	}
+	if tag.Tagger == nil {
+		t.Fatalf("tagger missing in body %q", string(body))
+	}
+	if !bytes.Contains(tag.Tagger.Name, []byte("Tagger")) {
+		t.Fatalf("tagger name mismatch: %q", tag.Tagger.Name)
+	}
+	if string(tag.Name) != "v1.0" {
+		t.Fatalf("tag name mismatch: %q", tag.Name)
+	}
+	serialized, err := tag.Serialize()
+	if err != nil {
+		t.Fatalf("Serialize error: %v", err)
+	}
+	if !strings.Contains(string(serialized), "tag v1.0") {
+		t.Fatalf("serialized tag missing name header")
+	}
+}