test: always use UTC timezone for unit tests

Author: jamaljsr

app/package.json

@@ -76,6 +76,7 @@
     ]
   },
   "jest": {
+    "globalSetup": "./src/setupTestsGlobal.ts",
     "collectCoverageFrom": [
       "src/**/*.{js,jsx,ts,tsx}",
       "!src/**/*.d.ts",

app/src/__tests__/timezone.ts

@@ -0,0 +1,22 @@
+import { loopListSwaps } from 'util/tests/sampleData';
+import { Swap } from 'store/models';
+
+/**
+ * These test just ensure that the test runner is executing with
+ * the system time zone set to UTC. This prevents tests from passing
+ * on one machine and failing on another due to different time zones
+ *
+ * The `process.env.TZ` value is set to UTC in the jest global
+ * config file setupTestsGlobal.ts
+ */
+describe('Timezone', () => {
+  it('should always run unit tests in UTC', () => {
+    expect(new Date().getTimezoneOffset()).toBe(0);
+  });
+
+  it('should format the swap timestamps correctly', () => {
+    const swap = new Swap(loopListSwaps.swapsList[0]);
+    expect(swap.createdOnLabel).toEqual('4/8/2020 11:59:13 PM');
+    expect(swap.updatedOnLabel).toEqual('4/9/2020 2:12:49 AM');
+  });
+});

app/src/__tests__/util/csv.spec.ts

@@ -16,7 +16,7 @@ describe('csv Util', () => {
     const actual = csv.convert(Swap.csvColumns, swaps);
     const expected = [
       '"Swap ID","Type","Amount","Status","Created On","Updated On"',
-      '"f4eb118383c2b09d8c7289ce21c25900cfb4545d46c47ed23a31ad2aa57ce830","Loop Out","500000","Failed","4/8/2020 7:59:13 PM","4/8/2020 10:12:49 PM"',
+      '"f4eb118383c2b09d8c7289ce21c25900cfb4545d46c47ed23a31ad2aa57ce830","Loop Out","500000","Failed","4/8/2020 11:59:13 PM","4/9/2020 2:12:49 AM"',
     ].join('\n');
     expect(actual).toEqual(expected);
   });

app/src/setupTestsGlobal.ts

@@ -0,0 +1,3 @@
+export default () => {
+  process.env.TZ = 'UTC';
+};