From 58698a0e70c61c7447ec9a7b938fc63a94151db1 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sun, 7 Jun 2026 12:12:39 +0000
Subject: object/tree: Add tests

---
 object/tree/insert_test.go | 102 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 object/tree/insert_test.go

(limited to 'object/tree/insert_test.go')

diff --git a/object/tree/insert_test.go b/object/tree/insert_test.go
new file mode 100644
index 00000000..fbf65b84
--- /dev/null
+++ b/object/tree/insert_test.go
@@ -0,0 +1,102 @@
+package tree_test
+
+import (
+	"errors"
+	"testing"
+
+	"lindenii.org/go/furgit/object/id"
+	"lindenii.org/go/furgit/object/tree"
+	"lindenii.org/go/furgit/object/tree/mode"
+)
+
+func TestInsertRejects(t *testing.T) {
+	t.Parallel()
+
+	zero := id.SupportedObjectFormats()[0].Zero()
+
+	for _, tc := range []struct {
+		name  string
+		entry tree.Entry
+	}{
+		{name: "empty-name", entry: tree.Entry{Mode: mode.Regular, Name: "", ID: zero}},
+		{name: "slash-name", entry: tree.Entry{Mode: mode.Regular, Name: "a/b", ID: zero}},
+		{name: "nul-name", entry: tree.Entry{Mode: mode.Regular, Name: "a\x00b", ID: zero}},
+		{name: "invalid-mode", entry: tree.Entry{Mode: mode.Mode(0o100640), Name: "file", ID: zero}},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			var tr tree.Tree
+
+			err := tr.Insert(tc.entry)
+			if !errors.Is(err, tree.ErrInvalidTree) {
+				t.Fatalf("Insert error = %v, want ErrInvalidTree", err)
+			}
+		})
+	}
+}
+
+func TestInsertRejectsConflict(t *testing.T) {
+	t.Parallel()
+
+	zero := id.SupportedObjectFormats()[0].Zero()
+
+	for _, tc := range []struct {
+		name   string
+		first  tree.Entry
+		second tree.Entry
+	}{
+		{
+			name:   "same-mode",
+			first:  tree.Entry{Mode: mode.Regular, Name: "file", ID: zero},
+			second: tree.Entry{Mode: mode.Regular, Name: "file", ID: zero},
+		},
+		{
+			name:   "blob-then-tree",
+			first:  tree.Entry{Mode: mode.Regular, Name: "name", ID: zero},
+			second: tree.Entry{Mode: mode.Directory, Name: "name", ID: zero},
+		},
+		{
+			name:   "tree-then-blob",
+			first:  tree.Entry{Mode: mode.Directory, Name: "name", ID: zero},
+			second: tree.Entry{Mode: mode.Regular, Name: "name", ID: zero},
+		},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+
+			var tr tree.Tree
+
+			err := tr.Insert(tc.first)
+			if err != nil {
+				t.Fatalf("Insert(first): %v", err)
+			}
+
+			err = tr.Insert(tc.second)
+			if !errors.Is(err, tree.ErrInvalidTree) {
+				t.Fatalf("Insert(second) error = %v, want ErrInvalidTree", err)
+			}
+		})
+	}
+}
+
+func TestEntriesIsCopy(t *testing.T) {
+	t.Parallel()
+
+	zero := id.SupportedObjectFormats()[0].Zero()
+
+	var tr tree.Tree
+
+	err := tr.Insert(tree.Entry{Mode: mode.Regular, Name: "file", ID: zero})
+	if err != nil {
+		t.Fatalf("Insert: %v", err)
+	}
+
+	entries := tr.Entries()
+	entries[0].Name = "mutated"
+
+	again := tr.Entries()
+	if again[0].Name != "file" {
+		t.Fatalf("Entries()[0].Name = %q, want %q", again[0].Name, "file")
+	}
+}
-- 
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