Add mock for getCycleDay

home.js

@@ -5,6 +5,7 @@ import {
   Text
 } from 'react-native'
 import styles from './styles'
+import getCycleDay from './get-cycle-day'
 
 export default class Home extends Component {
   constructor(props) {
@@ -15,7 +16,7 @@ export default class Home extends Component {
     const navigate = this.props.navigation.navigate
     return (
       <View style={styles.container}>
-        <Text style={styles.welcome}>Welcome! Today is day 6 of your current cycle</Text>
+        <Text style={styles.welcome}>Welcome! Today is day {getCycleDay()} of your current cycle</Text>
         <Button
           onPress={() => navigate('temperatureList')}
           title="Edit symptoms for today">