improvement: flow coverage

src/components/Feed/Feed.js

@@ -1,9 +1,15 @@
+// @flow
 import React from 'react';
 import moment from 'moment';
 import { Link } from 'gatsby';
+import type { Edges } from '../../types';
 import styles from './Feed.module.scss';
 
-const Feed = ({ edges }) => (
+type Props = {
+  edges: Edges
+};
+
+const Feed = ({ edges }: Props) => (
   <div className={styles['feed']}>
     {edges.map((edge) => (
       <div className={styles['feed__item']} key={edge.node.fields.slug}>

src/components/Feed/Feed.test.js

@@ -1,3 +1,4 @@
+// @flow
 import React from 'react';
 import renderer from 'react-test-renderer';
 import Feed from './Feed';
@@ -9,28 +10,50 @@ describe('Feed', () => {
         node: {
           fields: {
             slug: '/test_0',
-            categorySlug: '/test_0'
+            categorySlug: '/test_0',
+            tagSlugs: [
+              '/test-1',
+              '/test-2'
+            ]
           },
           frontmatter: {
             date: '2016-09-01',
             description: 'test_0',
             category: 'test_0',
+            tags: [
+              'test-1',
+              'test-2'
+            ],
             title: 'test_0'
-          }
+          },
+          id: 'test-123',
+          html: '<p>test</p>'
+
         }
       },
       {
         node: {
           fields: {
             slug: '/test_1',
-            categorySlug: '/test_1'
+            categorySlug: '/test_1',
+            tagSlugs: [
+              '/test-1',
+              '/test-2'
+            ]
           },
           frontmatter: {
             date: '2016-09-01',
             description: 'test_1',
             category: 'test_1',
+            tags: [
+              'test-1',
+              'test-2'
+            ],
             title: 'test_1'
-          }
+          },
+          id: 'test-321',
+          html: '<p>test</p>'
+
         }
       }
     ]

src/components/Feed/index.js

@@ -1 +1,2 @@
+// @flow
 export { default } from './Feed';