unit tests added for utils

test/mem-server.utils.js

@@ -0,0 +1,31 @@
+require('babel-register')({
+  presets: ['env']
+});
+
+const assert = require('assert');
+const { generateUUID, primaryKeyTypeSafetyCheck } = require('../lib/mem-server/utils.js');
+
+describe('MemServer Utils Unit tests', function() {
+  it('exports generateUUID correctly', function() {
+    const UUIDs = Array.from({ length: 10 }).map(() => generateUUID());
+
+    assert.equal(UUIDs.length, 10);
+    UUIDs.forEach((currentUUID) => {
+      assert.equal(currentUUID.length, 36);
+      assert.equal(UUIDs.filter((uuid) => uuid === currentUUID).length, 1);
+    })
+  })
+
+  it('exports primaryKeyTypeSafetyCheck correctly', function() {
+    assert.throws(() => primaryKeyTypeSafetyCheck('id', '22', 'Photo'), (err) => {
+      return (err instanceof Error) &&
+      /MemServer Photo model primaryKey type is 'id'. Instead you've tried to enter id: 22 with string type/.test(err);
+    });
+    assert.doesNotThrow(() => primaryKeyTypeSafetyCheck('id', 22, 'Photo'), Error);
+    assert.throws(() => primaryKeyTypeSafetyCheck('uuid', 22, 'PhotoComment'), (err) => {
+      return (err instanceof Error) &&
+      /MemServer PhotoComment model primaryKey type is 'uuid'. Instead you've tried to enter uuid: 22 with number type/.test(err);
+    });
+    assert.doesNotThrow(() => primaryKeyTypeSafetyCheck('uuid', '166a435d-ad3d-4662-9f6f-04373280a38b', 'PhotoComment'), Error);
+  });
+});