Adds tests for environments store

spec/javascripts/environments/environments_store_spec.js.es6

+//= require vue
+//= require vue-resource
+//= require lib/utils/url_utility
+//= require ./mock_data
+// 
+
+(() => {
+  beforeEach(() => {
+    gl.environmentsService = new EnvironmentsService('test/environments');
+    gl.environmentsList.EnvironmentsStore.create();
+  });
+  
+  describe('Store', () => {
+    it('starts with a blank state', () => {
+      expect(gl.environmentsList.EnvironmentsStore.state.environments.length).toBe(0);
+    });
+    
+  });
+})();

spec/javascripts/environments/mock_data.js.es6

+const environmentsList = [
+  {
+    "id": 15,
+    "project_id": 11,
+    "name": "production",
+    "created_at": "2016-10-18T10:47:46.840Z",
+    "updated_at": "2016-10-19T15:49:24.378Z",
+    "external_url": "https://test.com",
+    "environment_type": null,
+    "state": "available",
+    "last_deployment": {
+      "id": 57,
+      "iid": 5,
+      "project_id": 11,
+      "environment_id": 15,
+      "ref": "master",
+      "tag": false,
+      "sha": "edf8704ba6cea79be4634b82927e9ff534068428",
+      "user_id": 1,
+      "deployable_id": 1170,
+      "deployable_type": "CommitStatus",
+      "on_stop": null,
+      "short_sha": "edf8704b",
+      "commit_title": "Update .gitlab-ci.yml",
+      "commit": {
+        "id": "edf8704ba6cea79be4634b82927e9ff534068428",
+        "message": "Update .gitlab-ci.yml",
+        "parent_ids": ["f215999006bd3d5c89b9b1e8c0873c9aca0f913a"],
+        "authored_date": "2016-10-19T16:49:09.000+01:00",
+        "author_name": "Administrator",
+        "author_email": "admin@example.com",
+        "committed_date": "2016-10-19T16:49:09.000+01:00",
+        "committer_name": "Administrator",
+        "committer_email": "admin@example.com"
+      },
+      "user": {
+        "id": 1,
+        "name": "Administrator",
+        "username": "root",
+        "avatar_url": "http://www.gravatar.com/avatar/e64c7d89f26bd1972efa854d13d7dd61?s=80\u0026d=identicon"
+      },
+      "deployable": {
+        "id": 1170,
+        "name": "deploy",
+        "tag": false,
+        "ref": "master"
+      }
+    },
+    "project": {
+      "id": 11,
+      "name": "review-apps",
+      "path": "review-apps",
+      "namespace_id": 1,
+      "namespace": {
+        "id": 1,
+        "name": "root"
+      }
+    }
+  },{
+    "id": 18,
+    "project_id": 11,
+    "name": "review/test-environment",
+    "created_at": "2016-10-19T14:59:59.303Z",
+    "updated_at": "2016-10-19T14:59:59.303Z",
+    "external_url": "http://test1.com",
+    "environment_type": "review",
+    "state": "available",
+    "project": {
+      "id": 11,
+      "name": "review-apps",
+      "namespace": {
+        "id": 1,
+        "name": "root"
+      }
+    }
+  }
+];
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