1 files changed, 68 insertions, 0 deletions
diff --git a/test/unit/migrations/migrator-test.js b/test/unit/migrations/migrator-test.js
new file mode 100644
index 000000000..a9374dff1
--- /dev/null
+++ b/test/unit/migrations/migrator-test.js
@@ -0,0 +1,68 @@
+const assert = require('assert')
+const clone = require('clone')
+const Migrator = require('../../../app/scripts/lib/migrator/')
+const liveMigrations = require('../../../app/scripts/migrations/')
+const stubMigrations = [
+  {
+    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'}}
+
+const firstTimeState = {
+  meta: { version: 0 },
+  data: require('../../../app/scripts/first-time-state'),
+}
+
+describe('Migrator', () => {
+  const migrator = new Migrator({ migrations: stubMigrations })
+  it('migratedData version should be version 3', (done) => {
+    migrator.migrateData(versionedData)
+    .then((migratedData) => {
+      assert.equal(migratedData.meta.version, stubMigrations[2].version)
+      done()
+    }).catch(done)
+  })
+
+  it('should match the last version in live migrations', (done) => {
+    const migrator = new Migrator({ migrations: liveMigrations })
+    migrator.migrateData(firstTimeState)
+    .then((migratedData) => {
+      const last = liveMigrations.length - 1
+      assert.equal(migratedData.meta.version, liveMigrations[last].version)
+      done()
+    }).catch(done)
+  })
+
+  it('should emit an error', function (done) {
+    this.timeout(15000)
+    const migrator = new Migrator({ migrations: [{ version: 1, migrate: async () => { throw new Error('test') } } ] })
+    migrator.on('error', () => done())
+    migrator.migrateData({ meta: {version: 0} })
+    .then((migratedData) => {
+    }).catch(done)
+  })
+
+})