Allow everyone to read or write a wiki by a repo unit setting (#30495)

Replace #6312
Help #5833
Wiki solution for #639

models/perm/access_mode_test.go

@@ -0,0 +1,22 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package perm
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAccessMode(t *testing.T) {
+	names := []string{"none", "read", "write", "admin"}
+	for i, name := range names {
+		m := ParseAccessMode(name)
+		assert.Equal(t, AccessMode(i), m)
+	}
+	assert.Equal(t, AccessMode(4), AccessModeOwner)
+	assert.Equal(t, "owner", AccessModeOwner.ToString())
+	assert.Equal(t, AccessModeNone, ParseAccessMode("owner"))
+	assert.Equal(t, AccessModeNone, ParseAccessMode("invalid"))
+}