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diff --git a/spec/frontend/members/store/mutations_spec.js b/spec/frontend/members/store/mutations_spec.js
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+++ b/spec/frontend/members/store/mutations_spec.js
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+import { members, group } from 'jest/members/mock_data';
+import mutations from '~/members/store/mutations';
+import * as types from '~/members/store/mutation_types';
+
+describe('Vuex members mutations', () => {
+  describe('update member mutations', () => {
+    let state;
+
+    beforeEach(() => {
+      state = {
+        members,
+        showError: false,
+        errorMessage: '',
+      };
+    });
+
+    describe(types.RECEIVE_MEMBER_ROLE_SUCCESS, () => {
+      it('updates member', () => {
+        const accessLevel = { integerValue: 30, stringValue: 'Developer' };
+
+        mutations[types.RECEIVE_MEMBER_ROLE_SUCCESS](state, {
+          memberId: members[0].id,
+          accessLevel,
+        });
+
+        expect(state.members[0].accessLevel).toEqual(accessLevel);
+      });
+    });
+
+    describe(types.RECEIVE_MEMBER_ROLE_ERROR, () => {
+      it('shows error message', () => {
+        mutations[types.RECEIVE_MEMBER_ROLE_ERROR](state);
+
+        expect(state.showError).toBe(true);
+        expect(state.errorMessage).toBe(
+          "An error occurred while updating the member's role, please try again.",
+        );
+      });
+    });
+
+    describe(types.RECEIVE_MEMBER_EXPIRATION_SUCCESS, () => {
+      it('updates member', () => {
+        const expiresAt = '2020-03-17T00:00:00Z';
+
+        mutations[types.RECEIVE_MEMBER_EXPIRATION_SUCCESS](state, {
+          memberId: members[0].id,
+          expiresAt,
+        });
+
+        expect(state.members[0].expiresAt).toEqual(expiresAt);
+      });
+    });
+
+    describe(types.RECEIVE_MEMBER_EXPIRATION_ERROR, () => {
+      it('shows error message', () => {
+        mutations[types.RECEIVE_MEMBER_EXPIRATION_ERROR](state);
+
+        expect(state.showError).toBe(true);
+        expect(state.errorMessage).toBe(
+          "An error occurred while updating the member's expiration date, please try again.",
+        );
+      });
+    });
+  });
+
+  describe(types.HIDE_ERROR, () => {
+    it('sets `showError` to `false`', () => {
+      const state = {
+        showError: true,
+        errorMessage: 'foo bar',
+      };
+
+      mutations[types.HIDE_ERROR](state);
+
+      expect(state.showError).toBe(false);
+    });
+
+    it('sets `errorMessage` to an empty string', () => {
+      const state = {
+        showError: true,
+        errorMessage: 'foo bar',
+      };
+
+      mutations[types.HIDE_ERROR](state);
+
+      expect(state.errorMessage).toBe('');
+    });
+  });
+
+  describe(types.SHOW_REMOVE_GROUP_LINK_MODAL, () => {
+    it('sets `removeGroupLinkModalVisible` and `groupLinkToRemove`', () => {
+      const state = {
+        removeGroupLinkModalVisible: false,
+        groupLinkToRemove: null,
+      };
+
+      mutations[types.SHOW_REMOVE_GROUP_LINK_MODAL](state, group);
+
+      expect(state).toEqual({
+        removeGroupLinkModalVisible: true,
+        groupLinkToRemove: group,
+      });
+    });
+  });
+
+  describe(types.HIDE_REMOVE_GROUP_LINK_MODAL, () => {
+    it('sets `removeGroupLinkModalVisible` to `false`', () => {
+      const state = {
+        removeGroupLinkModalVisible: false,
+      };
+
+      mutations[types.HIDE_REMOVE_GROUP_LINK_MODAL](state);
+
+      expect(state.removeGroupLinkModalVisible).toBe(false);
+    });
+  });
+});