1 files changed, 66 insertions, 0 deletions
diff --git a/object/tree_parse_test.go b/object/tree_parse_test.go
new file mode 100644
index 00000000..bbe7c69b
--- /dev/null
+++ b/object/tree_parse_test.go
@@ -0,0 +1,66 @@
+package object_test
+
+import (
+	"bytes"
+	"testing"
+
+	"codeberg.org/lindenii/furgit/internal/testgit"
+	"codeberg.org/lindenii/furgit/object"
+	"codeberg.org/lindenii/furgit/oid"
+)
+
+func TestTreeParseFromGit(t *testing.T) {
+	testgit.ForEachAlgorithm(t, func(t *testing.T, algo oid.Algorithm) {
+		repo := testgit.NewBareRepo(t, algo)
+		entries := adversarialRootEntries(t, repo)
+		inserted := &object.Tree{}
+		for _, entry := range entries {
+			if err := inserted.InsertEntry(entry); err != nil {
+				t.Fatalf("InsertEntry(%q): %v", entry.Name, err)
+			}
+		}
+
+		treeID := repo.Mktree(t, buildGitMktreeInput(inserted.Entries))
+
+		rawBody := repo.CatFile(t, "tree", treeID)
+		tree, err := object.ParseTree(rawBody, algo)
+		if err != nil {
+			t.Fatalf("ParseTree: %v", err)
+		}
+		if len(tree.Entries) != len(inserted.Entries) {
+			t.Fatalf("entry count = %d, want %d", len(tree.Entries), len(inserted.Entries))
+		}
+
+		for i := range inserted.Entries {
+			got := tree.Entries[i]
+			want := inserted.Entries[i]
+			if got.Mode != want.Mode || got.ID != want.ID || !bytes.Equal(got.Name, want.Name) {
+				t.Fatalf("entry[%d] mismatch: got (%o,%q,%s) want (%o,%q,%s)",
+					i, got.Mode, got.Name, got.ID, want.Mode, want.Name, want.ID)
+			}
+		}
+
+		lsNames := gitLsTreeNames(repo.RunBytes(t, "ls-tree", "--name-only", "-z", treeID.String()))
+		if len(lsNames) != len(tree.Entries) {
+			t.Fatalf("ls-tree names = %d, want %d", len(lsNames), len(tree.Entries))
+		}
+		for i := range lsNames {
+			if !bytes.Equal(lsNames[i], tree.Entries[i].Name) {
+				t.Fatalf("ordering mismatch at %d: git=%q parsed=%q", i, lsNames[i], tree.Entries[i].Name)
+			}
+		}
+
+		for _, want := range inserted.Entries {
+			got := tree.Entry(want.Name)
+			if got == nil {
+				t.Fatalf("Entry(%q) returned nil", want.Name)
+			}
+			if got.Mode != want.Mode || got.ID != want.ID {
+				t.Fatalf("Entry(%q) mismatch", want.Name)
+			}
+		}
+		if tree.Entry([]byte("does-not-exist")) != nil {
+			t.Fatalf("Entry on missing name should be nil")
+		}
+	})
+}