1 files changed, 154 insertions, 0 deletions
diff --git a/object/commit/parse_test.go b/object/commit/parse_test.go
new file mode 100644
index 00000000..58545db7
--- /dev/null
+++ b/object/commit/parse_test.go
@@ -0,0 +1,154 @@
+package commit_test
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"testing"
+
+	"lindenii.org/go/furgit/internal/testgit"
+	"lindenii.org/go/furgit/object/commit"
+	"lindenii.org/go/furgit/object/id"
+	"lindenii.org/go/furgit/object/typ"
+)
+
+func TestParse(t *testing.T) {
+	t.Parallel()
+
+	for _, objectFormat := range id.SupportedObjectFormats() {
+		t.Run(objectFormat.String(), func(t *testing.T) {
+			t.Parallel()
+
+			repo, err := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: objectFormat})
+			if err != nil {
+				t.Fatalf("NewRepo: %v", err)
+			}
+
+			blobID, err := repo.HashObject(t, typ.TypeBlob, strings.NewReader("content\n"))
+			if err != nil {
+				t.Fatalf("HashObject: %v", err)
+			}
+
+			treeID, err := repo.MkTree(t, []testgit.MkTreeEntry{
+				{Mode: "100644", Type: typ.TypeBlob, OID: blobID, Name: "file.txt"},
+			})
+			if err != nil {
+				t.Fatalf("MkTree: %v", err)
+			}
+
+			commitID, err := repo.CommitTree(t, treeID, "subject\n\nbody")
+			if err != nil {
+				t.Fatalf("CommitTree: %v", err)
+			}
+
+			rawBody, err := repo.CatFile(t, typ.TypeCommit, commitID)
+			if err != nil {
+				t.Fatalf("CatFile: %v", err)
+			}
+
+			parsed, err := commit.Parse(rawBody, objectFormat)
+			if err != nil {
+				t.Fatalf("Parse: %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 TestParseMultipleParents(t *testing.T) {
+	t.Parallel()
+
+	for _, objectFormat := range id.SupportedObjectFormats() {
+		t.Run(objectFormat.String(), func(t *testing.T) {
+			t.Parallel()
+
+			repo, err := testgit.NewRepo(t, testgit.RepoOptions{ObjectFormat: objectFormat})
+			if err != nil {
+				t.Fatalf("NewRepo: %v", err)
+			}
+
+			blobID, err := repo.HashObject(t, typ.TypeBlob, strings.NewReader("merge-content\n"))
+			if err != nil {
+				t.Fatalf("HashObject: %v", err)
+			}
+
+			treeID, err := repo.MkTree(t, []testgit.MkTreeEntry{
+				{Mode: "100644", Type: typ.TypeBlob, OID: blobID, Name: "file.txt"},
+			})
+			if err != nil {
+				t.Fatalf("MkTree: %v", err)
+			}
+
+			parent1, err := repo.CommitTree(t, treeID, "parent-one")
+			if err != nil {
+				t.Fatalf("CommitTree(parent1): %v", err)
+			}
+
+			parent2, err := repo.CommitTree(t, treeID, "parent-two", parent1)
+			if err != nil {
+				t.Fatalf("CommitTree(parent2): %v", err)
+			}
+
+			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, err := repo.HashObject(t, typ.TypeCommit, strings.NewReader(rawCommit))
+			if err != nil {
+				t.Fatalf("HashObject(merge): %v", err)
+			}
+
+			rawBody, err := repo.CatFile(t, typ.TypeCommit, mergeID)
+			if err != nil {
+				t.Fatalf("CatFile: %v", err)
+			}
+
+			parsed, err := commit.Parse(rawBody, objectFormat)
+			if err != nil {
+				t.Fatalf("Parse(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")
+			}
+		})
+	}
+}