Fix crash on first login & scrollToIndex crash

redux/actions/userActions.ts

@@ -59,7 +59,7 @@ export const signIn = (): UserThunkAction => async (
   dispatch: UserDispatch,
 ): Promise<void> => {
   dispatch(isSigningIn())
-  const returnUrl = `${AuthSession.makeRedirectUri()}${Platform.OS === `ios` ? `/` : ``}redirect`
+  const returnUrl = AuthSession.makeRedirectUri()
   const result = await AuthSession.startAsync({
     authUrl: `${ASSISTANT_API_URL}/connect/uclapi?return=${encodeURIComponent(
       returnUrl,

screens/Timetable/TimetableDetailScreen/__tests__/TimetableDetailScreen.test.tsx

@@ -65,4 +65,9 @@ describe(`TimetableDetailScreen`, () => {
     wrapper = await render(<TimetableDetailScreen {...mockProps} />)
     expect(wrapper).toMatchSnapshot()
   })
+
+  it(`renders the TimetableDetailScreen with no entries`, async () => {
+    wrapper = await render(<TimetableDetailScreen {...mockProps} timetable={[]} />)
+    expect(wrapper).toMatchSnapshot()
+  })
 })

screens/Timetable/TimetableDetailScreen/__tests__/__snapshots__/TimetableDetailScreen.test.tsx.snap

@@ -1,3 +1,5 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`TimetableDetailScreen renders the TimetableDetailScreen 1`] = `"{\\"initialRegion\\":{\\"latitude\\":51.5246586,\\"latitudeDelta\\":0.0012,\\"longitude\\":-0.1339784,\\"longitudeDelta\\":0.0071},\\"date\\":\\"2020-01-01\\",\\"contact\\":\\"Anne Oldman\\",\\"end_time\\":\\"00:01\\",\\"location\\":{\\"address\\":[\\"221C Banana Bread Street\\"],\\"name\\":\\"Waffle House\\"},\\"module\\":{\\"department_name\\":\\"Criminology\\",\\"lecturer\\":{\\"department_id\\":\\"CRIM\\",\\"name\\":\\"Jack Cloth\\"},\\"module_id\\":\\"ABC123\\"},\\"start_time\\":\\"00:00\\",\\"navigation\\":{}}"`;
+
+exports[`TimetableDetailScreen renders the TimetableDetailScreen with no entries 1`] = `"{\\"initialRegion\\":{\\"latitude\\":51.5246586,\\"latitudeDelta\\":0.0012,\\"longitude\\":-0.1339784,\\"longitudeDelta\\":0.0071},\\"date\\":\\"2020-01-01\\",\\"navigation\\":{}}"`;

screens/Timetable/TimetableScreen/TimetableScreen.tsx

@@ -157,12 +157,15 @@ class TimetableScreen extends React.Component<Props, State> {
   onSwipe = ({ nativeEvent: { position: index } }) => {
     const { fetchTimetable, user: { token }, timetable = [] } = this.props
 
-    if (timetable[index] === null) {
+    if (timetable[index] === null || index > timetable.length - 1) {
       // assumes closest valid index can always be found earlier, not later
       const closestValidIndex = timetable.findIndex((w) => w !== null)
-      const newDate = LocalisationManager.parseToMoment(
-        timetable[closestValidIndex][0].dateISO,
-      ).add(index - closestValidIndex, `weeks`)
+
+      const newDate = closestValidIndex === -1
+        ? LocalisationManager.getMoment()
+        : LocalisationManager.parseToMoment(
+          timetable[closestValidIndex][0].dateISO,
+        ).add(index - closestValidIndex, `weeks`)
 
       this.setState({ date: newDate })
       return fetchTimetable(token, newDate)

screens/Timetable/TimetableScreen/__tests__/WeekView.test.tsx

@@ -0,0 +1,54 @@
+/**
+ * @jest-environment jsdom
+ */
+import { cleanup, render } from "@testing-library/react-native"
+import MockDate from 'mockdate'
+import React from 'react'
+import "react-native"
+import { LocalisationManager } from "../../../../lib"
+import WeekView from "../components/WeekView"
+
+describe(`WeekView`, () => {
+  MockDate.set(`2019-11-18T08:47:21.000Z`)
+
+  afterEach(() => {
+    cleanup()
+  })
+
+  it(`renders the WeekView component`, () => {
+    const mockProps = {
+      date: LocalisationManager.getMoment().subtract(7, `days`),
+      isLoading: false,
+      navigation: {
+        dispatch: jest.fn(),
+        navigate: jest.fn(),
+      } as any,
+      onDateChanged: () => null,
+      onIndexChanged: () => null,
+      onRefresh: () => null,
+      timetable: [
+        {
+          contact: `Anne Oldman`,
+          end_time: `00:01`,
+          location: {
+            address: [
+              `221C Banana Bread Street`,
+            ],
+            name: `Waffle House`,
+          },
+          module: {
+            department_name: `Criminology`,
+            lecturer: {
+              department_id: `CRIM`,
+              name: `Jack Cloth`,
+            },
+            module_id: `ABC123`,
+          },
+          start_time: `00:00`,
+        },
+      ],
+    }
+    const wrapper = render(<WeekView {...mockProps} />)
+    expect(wrapper).toMatchSnapshot()
+  })
+})