Add a mutator action to set the MR Metadata

app/assets/javascripts/mr_notes/stores/actions.js

@@ -7,3 +7,7 @@ export function setActiveTab({ commit }, tab) {
 export function setEndpoints({ commit }, endpoints) {
   commit(types.SET_ENDPOINTS, endpoints);
 }
+
+export function setMrMetadata({ commit }, metadata) {
+  commit(types.SET_MR_METADATA, metadata);
+}

spec/frontend/mr_notes/stores/actions_spec.js

 import testAction from 'helpers/vuex_action_helper';
-import { setEndpoints } from '~/mr_notes/stores/actions';
+import { setEndpoints, setMrMetadata } from '~/mr_notes/stores/actions';
 import mutationTypes from '~/mr_notes/stores/mutation_types';
 
 describe('MR Notes Mutator Actions', () => {
@@ -22,4 +22,24 @@ describe('MR Notes Mutator Actions', () => {
       );
     });
   });
+
+  describe('setMrMetadata', () => {
+    it('should trigger the SET_MR_METADATA state mutation', (done) => {
+      const mrMetadata = { propA: 'a', propB: 'b' };
+
+      testAction(
+        setMrMetadata,
+        mrMetadata,
+        {},
+        [
+          {
+            type: mutationTypes.SET_MR_METADATA,
+            payload: mrMetadata,
+          },
+        ],
+        [],
+        done,
+      );
+    });
+  });
 });