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>

src/view/screens/Home.tsx

@@ -1,4 +1,4 @@
-import React, {useState, useEffect} from 'react'
+import React, {useEffect} from 'react'
 import {StyleSheet, TouchableOpacity, View} from 'react-native'
 import {observer} from 'mobx-react-lite'
 import useAppState from 'react-native-appstate-hook'
@@ -24,48 +24,48 @@ export const Home = observer(function Home({
   const store = useStores()
   const onMainScroll = useOnMainScroll(store)
   const safeAreaInsets = useSafeAreaInsets()
-  const [hasSetup, setHasSetup] = useState<boolean>(false)
+  const [wasVisible, setWasVisible] = React.useState<boolean>(false)
   const {appState} = useAppState({
     onForeground: () => doPoll(true),
   })
 
-  const doPoll = (knownActive = false) => {
-    if ((!knownActive && appState !== 'active') || !visible) {
-      return
-    }
-    if (store.me.mainFeed.isLoading) {
-      return
-    }
-    store.log.debug('Polling home feed')
-    store.me.mainFeed.checkForLatest().catch(e => {
-      store.log.error('Failed to poll feed', e)
-    })
-  }
+  const doPoll = React.useCallback(
+    (knownActive = false) => {
+      if ((!knownActive && appState !== 'active') || !visible) {
+        return
+      }
+      if (store.me.mainFeed.isLoading) {
+        return
+      }
+      store.log.debug('Polling home feed')
+      store.me.mainFeed.checkForLatest().catch(e => {
+        store.log.error('Failed to poll feed', e)
+      })
+    },
+    [appState, visible, store],
+  )
 
   useEffect(() => {
-    let aborted = false
     const pollInterval = setInterval(() => doPoll(), 15e3)
     if (!visible) {
+      setWasVisible(false)
+      return
+    } else if (wasVisible) {
       return
     }
+    setWasVisible(true)
 
-    if (hasSetup) {
-      store.log.debug('Updating home feed')
+    store.nav.setTitle(navIdx, 'Home')
+    store.log.debug('Updating home feed')
+    if (store.me.mainFeed.hasContent) {
       store.me.mainFeed.update()
-      doPoll()
     } else {
-      store.nav.setTitle(navIdx, 'Home')
-      store.log.debug('Fetching home feed')
-      store.me.mainFeed.setup().then(() => {
-        if (aborted) return
-        setHasSetup(true)
-      })
+      store.me.mainFeed.setup()
     }
     return () => {
       clearInterval(pollInterval)
-      aborted = true
     }
-  }, [visible, store])
+  }, [visible, store, navIdx, doPoll, wasVisible])
 
   const onPressCompose = () => {
     store.shell.openComposer({})
@@ -82,6 +82,7 @@ export const Home = observer(function Home({
     <View style={s.flex1}>
       <ViewHeader title="Bluesky" subtitle="Private Beta" canGoBack={false} />
       <Feed
+        testID="homeFeed"
         key="default"
         feed={store.me.mainFeed}
         scrollElRef={scrollElRef}