[RED] Add test for checking implementation

src/scenes/LoginPage/index.test.tsx

@@ -29,12 +29,14 @@ const testProps = {
   cache: {},
 }
 
-const mockNavigation = jest.fn()
+const mockNavigation = jest.fn();
+const mockReset = jest.fn();
 jest.mock('@react-navigation/native', () => {
   return {
     ...jest.requireActual('@react-navigation/native'),
     useNavigation: () => ({
       navigate: mockNavigation,
+      reset: mockReset
     }),
   };
 });
@@ -42,7 +44,7 @@ jest.doMock('@react-native-google-signin/google-signin')
 jest.mock('axios');
 const mockedAxios = axios as jest.Mocked<typeof axios>;
 
-afterEach(() => {
+beforeEach(() => {
   jest.clearAllMocks();
 });
 
@@ -231,7 +233,7 @@ it('inserts invalid (length<8) password', async () => {
   expect(testProps.alert.message).toBe("Unknown Server Error");
 });
 
-it('receives google token when signin is successful and succesfully navigates to next scene', async () => {
+it('goes to home if google sign in token already has corresponding user', async () => {
   LocalStorage.setSecretKey("sssttt");
   
   const instance = ReactTestRenderer.create(
@@ -271,6 +273,17 @@ it('receives google token when signin is successful and succesfully navigates to
 
   GoogleSignin.hasPlayServices = mockHasPlayServices
   GoogleSignin.signIn = mockSignin
+
+  mockedAxios.request.mockImplementationOnce(
+    () => new Promise(resolve => {
+      resolve({
+        status: 200,
+        data: {
+          token: "mock token"
+        }
+      });
+    })
+  );
   
   const googleSignin = instance.root.findByType(GoogleSigninButton);
   act(() => {
@@ -279,7 +292,6 @@ it('receives google token when signin is successful and succesfully navigates to
 
   await expect(mockHasPlayServices).toBeCalledTimes(1);
   await expect(mockSignin).toBeCalledTimes(1);
-  await expect(mockNavigation).toBeCalledTimes(1);
 
 });
 
@@ -373,4 +385,63 @@ it('receives nothing when has no play service failed and fails to navigate to ne
   await expect(mockSignin).toBeCalledTimes(0);
   await expect(mockNavigation).toBeCalledTimes(0);
 
+});
+
+it('receives google token when signin is successful and succesfully navigates to form', async () => {
+  LocalStorage.setSecretKey("sssttt");
+  
+  const instance = ReactTestRenderer.create(
+    <AppContext.Provider value={testProps}>
+      <NavigationContainer>
+        <Stack.Navigator
+          screenOptions={{
+            header: () => <></>,
+          }}>
+          <Stack.Screen name="login" component={LoginPage} />
+        </Stack.Navigator>
+      </NavigationContainer>
+    </AppContext.Provider>,
+  );
+
+  expect(instance.toJSON()).toMatchSnapshot();
+
+  const mockHasPlayServices = jest.fn().mockImplementationOnce(() => new Promise(resolve => {
+    resolve(true);
+  }));
+  
+  const mockSignin = jest.fn().mockImplementationOnce(() => new Promise(resolve => {
+    const data = {
+      idToken: "1234",
+      serverAuthCode: "4321",
+      user: {
+        email: "test@gmail.com",
+        id: "1234",
+        givenName: "test",
+        familyName: "test",
+        photo: "test.com", // url
+        name: "test" // full name
+      }
+    }
+    resolve(data);
+  }));
+
+  GoogleSignin.hasPlayServices = mockHasPlayServices
+  GoogleSignin.signIn = mockSignin
+
+  mockedAxios.request.mockImplementationOnce(
+    () => new Promise(resolve => {
+      resolve({
+        status: 203
+      });
+    })
+  );
+  
+  const googleSignin = instance.root.findByType(GoogleSigninButton);
+  act(() => {
+    googleSignin.props.onPress();
+  })
+
+  await expect(mockHasPlayServices).toBeCalledTimes(1);
+  await expect(mockSignin).toBeCalledTimes(1);
+
 });
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