Add tests for groups pages, DRY html into a component

app/assets/javascripts/discourse/templates/components/group-post-stream.js.hbs

@@ -0,0 +1,7 @@
+<div class='user-stream'>
+  {{#each posts as |post|}}
+    {{group-post post=post}}
+  {{else}}
+    <div>{{i18n emptyText}}</div>
+  {{/each}}
+</div>

app/assets/javascripts/discourse/templates/group/index.hbs

@@ -1,7 +1 @@
-<div class='user-stream'>
-  {{#each controller as |post|}}
-    {{group-post post=post}}
-  {{else}}
-    <div>{{i18n "groups.empty.posts"}}</div>
-  {{/each}}
-</div>
+{{group-post-stream posts=controller emptyText="groups.empty.posts"}}

app/assets/javascripts/discourse/templates/group/mentions.hbs

@@ -1,8 +1 @@
-<div class='user-stream'>
-  {{#each controller as |post|}}
-    {{group-post post=post}}
-  {{else}}
-    <div>{{i18n "groups.empty.mentions"}}</div>
-  {{/each}}
-</div>
-
+{{group-post-stream posts=controller emptyText="groups.empty.mentions"}}

app/assets/javascripts/discourse/templates/group/messages.hbs

@@ -1,7 +1 @@
-<div class='user-stream'>
-  {{#each controller as |post|}}
-    {{group-post post=post}}
-  {{else}}
-    <div>{{i18n "groups.empty.messages"}}</div>
-  {{/each}}
-</div>
+{{group-post-stream posts=controller emptyText="groups.empty.messages"}}

app/assets/javascripts/discourse/templates/group/topics.hbs

@@ -1,7 +1 @@
-<div class='user-stream'>
-  {{#each controller as |post|}}
-    {{group-post post=post}}
-  {{else}}
-    <div>{{i18n "groups.empty.topics"}}</div>
-  {{/each}}
-</div>
+{{group-post-stream posts=controller emptyText="groups.empty.topics"}}

test/javascripts/acceptance/groups-test.js.es6

@@ -11,4 +11,19 @@ test("Browsing Groups", () => {
   andThen(() => {
     ok(count('.group-members tr') > 0, "it lists group members");
   });
+
+  visit("/groups/discourse/topics");
+  andThen(() => {
+    ok(count('.user-stream .item') > 0, "it lists stream items");
+  });
+
+  visit("/groups/discourse/mentions");
+  andThen(() => {
+    ok(count('.user-stream .item') > 0, "it lists stream items");
+  });
+
+  visit("/groups/discourse/messages");
+  andThen(() => {
+    ok(count('.user-stream .item') > 0, "it lists stream items");
+  });
 });

test/javascripts/helpers/create-pretender.js.es6

@@ -170,6 +170,18 @@ export default function() {
                                            slug: request.params.slug } });
     });
 
+    this.get("/groups/discourse/topics.json", () => {
+      return response(200, fixturesByUrl['/groups/discourse/posts.json']);
+    });
+
+    this.get("/groups/discourse/mentions.json", () => {
+      return response(200, fixturesByUrl['/groups/discourse/posts.json']);
+    });
+
+    this.get("/groups/discourse/messages.json", () => {
+      return response(200, fixturesByUrl['/groups/discourse/posts.json']);
+    });
+
     this.get('/t/:topic_id/posts.json', request => {
       const postIds = request.queryParams.post_ids;
       const posts = postIds.map(p => ({id: parseInt(p), post_number: parseInt(p) }));