WIP: Added some basic unit tests

- Added unit test
- Added test fixtures
- Added test utils

test/unit/serializer.test.js

@@ -0,0 +1,39 @@
+'use strict'
+
+const { test } = require('tap')
+const Serializer = require('../../lib/Serializer')
+const { SerializationError, DeserializationError } = require('../../lib/errors')
+
+test('Basic', t => {
+  t.plan(2)
+  const s = new Serializer()
+  const obj = { hello: 'world' }
+  const json = JSON.stringify(obj)
+  t.strictEqual(s.serialize(obj), json)
+  t.deepEqual(s.deserialize(json), obj)
+})
+
+test('SerializationError', t => {
+  t.plan(1)
+  const s = new Serializer()
+  const obj = { hello: 'world' }
+  obj.o = obj
+  try {
+    s.serialize(obj)
+    t.fail('Should fail')
+  } catch (err) {
+    t.ok(err instanceof SerializationError)
+  }
+})
+
+test('DeserializationError', t => {
+  t.plan(1)
+  const s = new Serializer()
+  const json = '{"hello'
+  try {
+    s.deserialize(json)
+    t.fail('Should fail')
+  } catch (err) {
+    t.ok(err instanceof DeserializationError)
+  }
+})