Add tests for stats api

modules/__mocks__/getStatsMock.js

@@ -0,0 +1,29 @@
+export default function getStats(since, until) {
+  const stats = {
+    since: since,
+    until: until,
+    requests: {
+      all: 0,
+      cached: 0,
+      country: 0,
+      status: 0
+    },
+    bandwidth: {
+      all: 0,
+      cached: 0,
+      country: 0
+    },
+    threats: {
+      all: 0,
+      country: 0
+    },
+    uniques: {
+      all: 0
+    }
+  };
+
+  return Promise.resolve({
+    timeseries: [stats],
+    totals: stats
+  });
+}