Unit Testing (#35)

* add testing lib

* remove coverage folder from git

* finished basic test setup

* fix tests typescript and import paths

* add first snapshot

* testing utils

* rename test files; update script flags; ++tests

* testing utils functions

* testing downloadAndResize wip

* remove download test

* specify unwanted coverage paths;
remove update snapshots flag

* fix strings tests

* testing downloadAndResize method

* increasing testing

* fixing snapshots wip

* fixed shell mobile snapshot

* adding snapshots for the screens

* fix onboard snapshot

* fix typescript issues

* fix TabsSelector snapshot

* Account for testing device's locale in ago() tests

* Remove platform detection on regex

* mocking store state wip

* mocking store state

* increasing test coverage

* increasing test coverage

* increasing test coverage on src/screens

* src/screens (except for profile) above 80% cov

* testing profile screen wip

* increase coverage on Menu and TabsSelector

* mocking profile ui state wip

* mocking profile ui state wip

* fixing mobileshell tests wip

* snapshots using testing-library

* fixing profile tests wip

* removing mobile shell tests

* src/view/com tests wip

* remove unnecessary patch-package

* fixed profile test error

* clear mocks after every test

* fix base mocked store values (getters)

* fix base mocked store values
(hasLoaded, nonReplyFeed)

* profile screen above 80% coverage

* testing custom hooks

* improving composer coverage

* fix tests after merge

* finishing composer coverage

* improving src/com/discover coverage

* improve src/view/com/login coverage
fix SuggestedFollows tests
adding some comments

* fix SuggestedFollows tests

* improve src/view/com/profile coverage
extra minor fixes

* improve src/view/com/notifications coverage

* update coverage ignore patterns

* rename errorMessageTryAgainButton
increase SuggestedFollows converage

* improve src/view/com/posts coverage

* improve src/view/com/onboard coverage

* update snapshot

* improve src/view/com/post coverage

* improve src/view/com/post-thread coverage
rename ErrorMessage tests
test Debug and Log components

* init testing state

* testing root-store

* updating comments

* small fixes

* removed extra console logs

* improve src/state/models coverage
refactor rootStore
rename some spies

* adding cleanup method after tests

* improve src/state/models coverage

* improve src/state/models coverage

* improve src/state/models coverage

* improve src/state/models coverage

* test setInterval in setupState

* Clean up tests and update Home screen state management

* Remove some tests we dont need

* Remove snapshot tests

* Remove any tests that dont demonstrate clear value

* Cleanup

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/__tests__/state/models/link-metas-view.test.ts b/__tests__/state/models/link-metas-view.test.ts
new file mode 100644
index 000000000..037418932
--- /dev/null
+++ b/__tests__/state/models/link-metas-view.test.ts
@@ -0,0 +1,72 @@
+import {RootStoreModel} from '../../../src/state/models/root-store'
+import {LinkMetasViewModel} from '../../../src/state/models/link-metas-view'
+import * as LinkMetaLib from '../../../src/lib/link-meta'
+import {LikelyType} from './../../../src/lib/link-meta'
+import {sessionClient, SessionServiceClient} from '@atproto/api'
+import {DEFAULT_SERVICE} from '../../../src/state'
+
+describe('LinkMetasViewModel', () => {
+  let viewModel: LinkMetasViewModel
+  let rootStore: RootStoreModel
+
+  const getLinkMetaMockSpy = jest.spyOn(LinkMetaLib, 'getLinkMeta')
+  const mockedMeta = {
+    title: 'Test Title',
+    url: 'testurl',
+    likelyType: LikelyType.Other,
+  }
+
+  beforeEach(() => {
+    const api = sessionClient.service(DEFAULT_SERVICE) as SessionServiceClient
+    rootStore = new RootStoreModel(api)
+    viewModel = new LinkMetasViewModel(rootStore)
+  })
+
+  afterAll(() => {
+    jest.clearAllMocks()
+  })
+
+  describe('getLinkMeta', () => {
+    it('should return link meta if it is cached', async () => {
+      const url = 'http://example.com'
+
+      viewModel.cache.set(url, mockedMeta)
+
+      const result = await viewModel.getLinkMeta(url)
+
+      expect(getLinkMetaMockSpy).not.toHaveBeenCalled()
+      expect(result).toEqual(mockedMeta)
+    })
+
+    it('should return link meta if it is not cached', async () => {
+      getLinkMetaMockSpy.mockResolvedValueOnce(mockedMeta)
+
+      const result = await viewModel.getLinkMeta(mockedMeta.url)
+
+      expect(getLinkMetaMockSpy).toHaveBeenCalledWith(mockedMeta.url)
+      expect(result).toEqual(mockedMeta)
+    })
+
+    it('should cache the link meta if it is successfully returned', async () => {
+      getLinkMetaMockSpy.mockResolvedValueOnce(mockedMeta)
+
+      await viewModel.getLinkMeta(mockedMeta.url)
+
+      expect(viewModel.cache.get(mockedMeta.url)).toEqual(mockedMeta)
+    })
+
+    it('should not cache the link meta if it fails to return', async () => {
+      const url = 'http://example.com'
+      const error = new Error('Failed to fetch link meta')
+      getLinkMetaMockSpy.mockRejectedValueOnce(error)
+
+      try {
+        await viewModel.getLinkMeta(url)
+        fail('Error was not thrown')
+      } catch (e) {
+        expect(e).toEqual(error)
+        expect(viewModel.cache.get(url)).toBeUndefined()
+      }
+    })
+  })
+})