1 files changed, 91 insertions, 0 deletions
diff --git a/object/commit/parse_test.go b/object/commit/parse_test.go
new file mode 100644
index 00000000..ad2c7aed
--- /dev/null
+++ b/object/commit/parse_test.go
@@ -0,0 +1,91 @@
+package commit_test
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+
+	"codeberg.org/lindenii/furgit/internal/testgit"
+	"codeberg.org/lindenii/furgit/object/commit"
+	objectid "codeberg.org/lindenii/furgit/object/id"
+)
+
+func TestCommitParseFromGit(t *testing.T) {
+	t.Parallel()
+	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) { //nolint:thelper
+		testRepo := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: algo, Bare: true})
+		_, treeID, commitID := testRepo.MakeCommit(t, "subject\n\nbody")
+
+		rawBody := testRepo.CatFile(t, "commit", commitID)
+
+		parsed, err := commit.Parse(rawBody, algo)
+		if err != nil {
+			t.Fatalf("ParseCommit: %v", err)
+		}
+
+		if parsed.Tree != treeID {
+			t.Fatalf("tree id mismatch: got %s want %s", parsed.Tree, treeID)
+		}
+
+		if len(parsed.Parents) != 0 {
+			t.Fatalf("parent count = %d, want 0", len(parsed.Parents))
+		}
+
+		if !bytes.Equal(parsed.Author.Name, []byte("Test Author")) {
+			t.Fatalf("author name = %q, want %q", parsed.Author.Name, "Test Author")
+		}
+
+		if !bytes.Equal(parsed.Committer.Name, []byte("Test Committer")) {
+			t.Fatalf("committer name = %q, want %q", parsed.Committer.Name, "Test Committer")
+		}
+
+		if !bytes.Contains(parsed.Message, []byte("subject")) {
+			t.Fatalf("commit message missing subject: %q", parsed.Message)
+		}
+	})
+}
+
+func TestCommitParseMultipleParents(t *testing.T) {
+	t.Parallel()
+	testgit.ForEachAlgorithm(t, func(t *testing.T, algo objectid.Algorithm) { //nolint:thelper
+		testRepo := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: algo, Bare: true})
+
+		_, treeID := testRepo.MakeSingleFileTree(t, "file.txt", []byte("merge-content\n"))
+		parent1 := testRepo.CommitTree(t, treeID, "parent-one")
+		parent2 := testRepo.CommitTree(t, treeID, "parent-two", parent1)
+
+		rawCommit := fmt.Sprintf(
+			"tree %s\nparent %s\nparent %s\nauthor Test Author <test@example.org> 1234567890 +0000\ncommitter Test Committer <committer@example.org> 1234567890 +0000\n\nMerge commit\n",
+			treeID,
+			parent1,
+			parent2,
+		)
+		mergeID := testRepo.HashObject(t, "commit", []byte(rawCommit))
+		rawBody := testRepo.CatFile(t, "commit", mergeID)
+
+		parsed, err := commit.Parse(rawBody, algo)
+		if err != nil {
+			t.Fatalf("ParseCommit(merge): %v", err)
+		}
+
+		if parsed.Tree != treeID {
+			t.Fatalf("merge tree = %s, want %s", parsed.Tree, treeID)
+		}
+
+		if len(parsed.Parents) != 2 {
+			t.Fatalf("merge parent count = %d, want 2", len(parsed.Parents))
+		}
+
+		if parsed.Parents[0] != parent1 {
+			t.Fatalf("merge parent[0] = %s, want %s", parsed.Parents[0], parent1)
+		}
+
+		if parsed.Parents[1] != parent2 {
+			t.Fatalf("merge parent[1] = %s, want %s", parsed.Parents[1], parent2)
+		}
+
+		if !bytes.Equal(parsed.Message, []byte("Merge commit\n")) {
+			t.Fatalf("merge message = %q, want %q", parsed.Message, "Merge commit\n")
+		}
+	})
+}