Add API for reading notifications

test/controllers/notifications_controller_test.rb

@@ -1,4 +1,27 @@
 require "test_helper"
 
 class NotificationsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+  end
+
+  test "index as JSON" do
+    get notifications_path, as: :json
+
+    assert_response :success
+    assert_kind_of Array, @response.parsed_body
+    assert @response.parsed_body.any? { |n| n["id"] == notifications(:logo_published_kevin).id }
+  end
+
+  test "index as JSON includes notification attributes" do
+    get notifications_path, as: :json
+
+    notification = @response.parsed_body.find { |n| n["id"] == notifications(:logo_published_kevin).id }
+
+    assert_not_nil notification["title"]
+    assert_not_nil notification["body"]
+    assert_not_nil notification["created_at"]
+    assert_not_nil notification["card"]
+    assert_not_nil notification["creator"]
+  end
 end