Feat/notifications tests (#514)

* Feat: add notificationService tests

* Test: add Notification router tests

* Test: add integration test for notifications

* Fix: notification tests to work with new behaviour

* Chore: swap constants to SCREAMING_SNAKE_CASE

* Chore: fix test description

* Chore: add comments

* Chore: modify test names

* Fix: cleanup tables between tests

src/fixtures/notifications.ts

@@ -0,0 +1,52 @@
+const CREATED_TIME = new Date()
+const READ_TIME = new Date()
+const OLD_READ_TIME = new Date("1995-12-17T03:24:00")
+
+export const normalPriorityUnreadNotification = {
+  message: "low priority unread notification",
+  link: "google.com",
+  sourceUsername: "user",
+  type: "sent_request",
+  firstReadTime: null,
+  priority: 2,
+  createdAt: CREATED_TIME,
+}
+
+export const normalPriorityReadNotification = {
+  ...normalPriorityUnreadNotification,
+  message: "low priority read notification",
+  firstReadTime: READ_TIME,
+}
+
+export const highPriorityUnreadNotification = {
+  ...normalPriorityUnreadNotification,
+  message: "high priority unread notification",
+  priority: 1,
+}
+
+export const highPriorityReadNotification = {
+  ...normalPriorityReadNotification,
+  message: "high priority read notification",
+  priority: 1,
+}
+
+export const normalPriorityOldReadNotification = {
+  ...normalPriorityReadNotification,
+  message: "low priority old notification",
+  firstReadTime: OLD_READ_TIME,
+}
+
+export const highPriorityOldReadNotification = {
+  ...highPriorityReadNotification,
+  message: "high priority old notification",
+  firstReadTime: OLD_READ_TIME,
+}
+
+export const formatNotification = (notification: any) => ({
+  message: notification.message,
+  createdAt: CREATED_TIME.toISOString(),
+  link: notification.link,
+  isRead: !!notification.firstReadTime,
+  sourceUsername: notification.sourceUsername,
+  type: notification.type,
+})