Removed unneeded param and better tests

app/assets/javascripts/vue_shared/components/notes/system_note.vue

@@ -107,11 +107,7 @@ export default {
           <span v-html="actionTextHtml"></span>
           <template v-if="canSeeDescriptionVersion" slot="extra-controls">
             &middot;
-            <button
-              type="button"
-              class="btn-blank btn-link"
-              @click="toggleDescriptionVersion(note.description_version_id)"
-            >
+            <button type="button" class="btn-blank btn-link" @click="toggleDescriptionVersion">
               {{ __('Compare with previous version') }}
               <icon :name="descriptionVersionToggleIcon" :size="12" class="append-left-5" />
             </button>

spec/frontend/notes/stores/mutation_spec.js

@@ -588,7 +588,7 @@ describe('Notes Store mutations', () => {
 
     it('adds a descriptionVersion', () => {
       mutations.RECEIVE_DESCRIPTION_VERSION(state, { descriptionVersion, versionId });
-      expect(state.descriptionVersions[versionId]).toContain(descriptionVersion);
+      expect(state.descriptionVersions[versionId]).toBe(descriptionVersion);
     });
   });
 
@@ -600,7 +600,7 @@ describe('Notes Store mutations', () => {
 
     it('updates descriptionVersion to "Deleted"', () => {
       mutations.RECEIVE_DELETE_DESCRIPTION_VERSION(state, { [versionId]: deleted });
-      expect(state.descriptionVersions[versionId]).toContain(deleted);
+      expect(state.descriptionVersions[versionId]).toBe(deleted);
     });
   });
 });