1 files changed, 40 insertions, 0 deletions
diff --git a/mascara/test/util/mascara-test-helper.js b/mascara/test/util/mascara-test-helper.js
new file mode 100644
index 000000000..1ed576005
--- /dev/null
+++ b/mascara/test/util/mascara-test-helper.js
@@ -0,0 +1,40 @@
+const EventEmitter = require('events')
+const IDB = require('../../../mascara/src/lib/index-db-controller')
+const KEY = 'metamask-test-config'
+module.exports = class Helper extends EventEmitter {
+  constructor () {
+    super()
+  }
+
+  tryToCleanContext () {
+    this.unregister()
+    .then(() => this.clearDb())
+    .then(() => super.emit('complete'))
+    .catch((err) => super.emit('complete'))
+  }
+
+  unregister () {
+    return global.navigator.serviceWorker.getRegistration()
+    .then((registration) => {
+      if (registration) return registration.unregister()
+      .then((b) => b ? Promise.resolve() : Promise.reject())
+      else return Promise.resolve()
+    })
+  }
+  clearDb () {
+    return new Promise ((resolve, reject) => {
+      const deleteRequest = global.indexDB.deleteDatabase(KEY)
+      deleteRequest.addEventListener('success', resolve)
+      deleteRequest.addEventListener('error', reject)
+    })
+
+  }
+  mockState (state) {
+    const db = new IDB({
+      version: 2,
+      key: KEY,
+      initialState: state
+    })
+    return db.open()
+  }
+}