## TestApp

The TestApp is currently being used as a dummy app by Circle CI for nightly jobs. The challenge comes when testing the arm64 build as we don't have a way to code-sign our TestApp. This is where Fastlane came to rescue. [Fastlane](https://fastlane.tools/) is a trendy automation tool for building and managing iOS applications. It also works seamlessly with Circle CI. We are going to leverage the `import_certificate` action, which can install developer certificates on CI machines. See `Fastfile` for more details.

For simulator build, we run unit tests as the last step of our CI workflow. Those unit tests can also be run manually via the `fastlane scan` command.