Create test for Migrator

test/unit/migrator-test.js

@@ -0,0 +1,41 @@
+const assert = require('assert')
+const clone = require('clone')
+const Migrator = require('../../app/scripts/lib/migrator/')
+const migrations = [
+  {
+    version: 1,
+    migrate: (data) => {
+      // clone the data just like we do in migrations
+      const clonedData = clone(data)
+      clonedData.meta.version = 1
+      return Promise.resolve(clonedData)
+    },
+  },
+  {
+    version: 2,
+    migrate: (data) => {
+      const clonedData = clone(data)
+      clonedData.meta.version = 2
+      return Promise.resolve(clonedData)
+    },
+  },
+  {
+    version: 3,
+    migrate: (data) => {
+      const clonedData = clone(data)
+      clonedData.meta.version = 3
+      return Promise.resolve(clonedData)
+    },
+  },
+]
+const versionedData = {meta: {version: 0}, data:{hello:'world'}}
+describe('Migrator', () => {
+  const migrator = new Migrator({ migrations })
+  it('migratedData version should be version 3', (done) => {
+    migrator.migrateData(versionedData)
+    .then((migratedData) => {
+      assert.equal(migratedData.meta.version, migrations[2].version)
+      done()
+    }).catch(done)
+  })
+})