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diff --git a/spec/javascripts/monitoring/store/mutations_spec.js b/spec/javascripts/monitoring/store/mutations_spec.js
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+++ b/spec/javascripts/monitoring/store/mutations_spec.js
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+import mutations from '~/monitoring/stores/mutations';
+import * as types from '~/monitoring/stores/mutation_types';
+import state from '~/monitoring/stores/state';
+import { metricsGroupsAPIResponse, deploymentData } from '../mock_data';
+
+describe('Monitoring mutations', () => {
+  let stateCopy;
+
+  beforeEach(() => {
+    stateCopy = state();
+  });
+
+  describe(types.RECEIVE_METRICS_DATA_SUCCESS, () => {
+    beforeEach(() => {
+      stateCopy.groups = [];
+      const groups = metricsGroupsAPIResponse.data;
+
+      mutations[types.RECEIVE_METRICS_DATA_SUCCESS](stateCopy, groups);
+    });
+
+    it('normalizes values', () => {
+      const expectedTimestamp = '2017-05-25T08:22:34.925Z';
+      const expectedValue = 0.0010794445585559514;
+      const [timestamp, value] = stateCopy.groups[0].metrics[0].queries[0].result[0].values[0];
+
+      expect(timestamp).toEqual(expectedTimestamp);
+      expect(value).toEqual(expectedValue);
+    });
+
+    it('contains two groups that contains, one of which has two queries sorted by priority', () => {
+      expect(stateCopy.groups).toBeDefined();
+      expect(stateCopy.groups.length).toEqual(2);
+      expect(stateCopy.groups[0].metrics.length).toEqual(2);
+    });
+
+    it('assigns queries a metric id', () => {
+      expect(stateCopy.groups[1].metrics[0].queries[0].metricId).toEqual('100');
+    });
+
+    it('removes the data if all the values from a query are not defined', () => {
+      expect(stateCopy.groups[1].metrics[0].queries[0].result.length).toEqual(0);
+    });
+
+    it('assigns metric id of null if metric has no id', () => {
+      stateCopy.groups = [];
+      const groups = metricsGroupsAPIResponse.data;
+      const noId = groups.map(group => ({
+        ...group,
+        ...{
+          metrics: group.metrics.map(metric => {
+            const { id, ...metricWithoutId } = metric;
+
+            return metricWithoutId;
+          }),
+        },
+      }));
+
+      mutations[types.RECEIVE_METRICS_DATA_SUCCESS](stateCopy, noId);
+
+      stateCopy.groups.forEach(group => {
+        group.metrics.forEach(metric => {
+          expect(metric.queries.every(query => query.metricId === null)).toBe(true);
+        });
+      });
+    });
+  });
+
+  describe(types.RECEIVE_DEPLOYMENTS_DATA_SUCCESS, () => {
+    it('stores the deployment data', () => {
+      stateCopy.deploymentData = [];
+      mutations[types.RECEIVE_DEPLOYMENTS_DATA_SUCCESS](stateCopy, deploymentData);
+
+      expect(stateCopy.deploymentData).toBeDefined();
+      expect(stateCopy.deploymentData.length).toEqual(3);
+      expect(typeof stateCopy.deploymentData[0]).toEqual('object');
+    });
+  });
+
+  describe('SET_ENDPOINTS', () => {
+    it('should set all the endpoints', () => {
+      mutations[types.SET_ENDPOINTS](stateCopy, {
+        metricsEndpoint: 'additional_metrics.json',
+        environmentsEndpoint: 'environments.json',
+        deploymentsEndpoint: 'deployments.json',
+      });
+
+      expect(stateCopy.metricsEndpoint).toEqual('additional_metrics.json');
+      expect(stateCopy.environmentsEndpoint).toEqual('environments.json');
+      expect(stateCopy.deploymentsEndpoint).toEqual('deployments.json');
+    });
+  });
+});