add controller tests

test/controllers/admin/dashboard_controller_test.rb

@@ -0,0 +1,36 @@
+require "test_helper"
+
+class Admin::DashboardControllerTest < ActionDispatch::IntegrationTest
+  test "should redirect to login when not authenticated" do
+    get admin_root_path
+    assert_redirected_to login_path
+    follow_redirect!
+    assert_select ".bg-red-50", /You must be logged in/
+  end
+
+  test "should redirect to root when logged in as non-admin" do
+    login_as(users(:contributor_user))
+    get admin_root_path
+    assert_redirected_to root_path
+    assert_equal "You must be an administrator to access this page.", flash[:alert]
+  end
+
+  test "should redirect to root when logged in as reviewer" do
+    login_as(users(:reviewer_user))
+    get admin_root_path
+    assert_redirected_to root_path
+    assert_equal "You must be an administrator to access this page.", flash[:alert]
+  end
+
+  test "should show dashboard when logged in as admin" do
+    login_as(users(:admin_user))
+    get admin_root_path
+    assert_response :success
+  end
+
+  test "should show admin dashboard path" do
+    login_as(users(:admin_user))
+    get admin_dashboard_path
+    assert_response :success
+  end
+end