Include tests for new inertia_rendering? helper method

Author: Andy9822

spec/inertia/helper_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+RSpec.describe InertiaRails::Helper do
+  let(:controller) { ApplicationController.new }
+
+  let(:test_helper) do
+    Class.new do
+      include InertiaRails::Helper
+      attr_accessor :controller
+    end.new
+  end
+
+  before do
+    test_helper.controller = controller
+  end
+
+  describe '#inertia_rendering?' do
+    context 'when not rendering through Inertia' do
+      it 'returns nil' do
+        expect(test_helper.inertia_rendering?).to be_nil
+      end
+    end
+
+    context 'when rendering through Inertia' do
+      before do
+        controller.instance_variable_set('@_inertia_rendering', true)
+      end
+
+      it 'returns true' do
+        expect(test_helper.inertia_rendering?).to be true
+      end
+    end
+  end
+end