Reduce test lines of code

__tests__/RoomItem.js

@@ -5,70 +5,16 @@ import RoomItem from '../app/components/RoomItem';
 // Note: test renderer must be required after react-native.
 import renderer from 'react-test-renderer';
 
-jest.mock('react-native-img-cache', () => {
+jest.mock('react-native-img-cache', () => { return { CachedImage: 'View' } });
-	return {
-		CachedImage: 'View'
-	}
-});
 
 it('renders correctly', () => {
-	const tree = renderer.create(
+	expect(renderer.create(<RoomItem type="d" name="name" />).toJSON()).toMatchSnapshot();
-		<RoomItem
-			type="d"
-			name="name"
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
 });
 
 it('render unread', () => {
-	const tree = renderer.create(
+	expect(renderer.create(<RoomItem type="d" name="name" unread={1} />).toJSON()).toMatchSnapshot();
-		<RoomItem
-			type="d"
-			name="name"
-			unread={1}
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
 });
 
 it('render unread +999', () => {
-	const tree = renderer.create(
+	expect(renderer.create(<RoomItem type="d" name="name" unread={1000} />).toJSON()).toMatchSnapshot();
-		<RoomItem
-			type="d"
-			name="name"
-			unread={1000}
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
-});
-
-it('render no icon', () => {
-	const tree = renderer.create(
-		<RoomItem
-			type="X"
-			name="name"
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
-});
-
-it('render private group', () => {
-	const tree = renderer.create(
-		<RoomItem
-			type="g"
-			name="private-group"
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
-});
-
-it('render channel', () => {
-	const tree = renderer.create(
-		<RoomItem
-			type="c"
-			name="general"
-		/>
-	).toJSON();
-	expect(tree).toMatchSnapshot();
 });