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Developing

This guide contains the steps required to contribute to the development of this project.

Setting up a development environment

This project runs on Apple's Metal rendering framework. Prerequisites for running the test app in simulators:

  • macOS 10.15 or later
  • Xcode 12.2+

This project:

  1. requires a valid ~/.netrc file to fetch dependencies.

  2. uses SwiftLint to enforce a style guide. Install it with brew install swiftlint and check for lint by running swiftlint in the root of the repository.

  3. uses Swift Package Manager to manage dependencies for development. Cocapods is supported for consuming the SDK.

  4. uses secret-shield to help block secrets such as access tokens from being exposed. Install secret-shield by entering npm install -g @mapbox/secret-shield. Install the pre-commit hook by running scripts/install-pre-commit/install-pre-commit.sh

  5. uses CircleCI and Firebase Test Lab for continuous integration.

Accessing the Maps SDK's source

Clone the git repository:

git clone git@github.com:mapbox/mapbox-maps-ios.git && cd mapbox-maps-ios

Building the Maps SDK

Pre-requisite: Valid .netrc file located on your machine at ~/.netrc. Please visit https://docs.mapbox.com/ios/maps/overview for additional information about setting up your .netrc file.

Open Package.swift and build the MapboxMaps target.

Running the Debug App

In order to use the debug app, open Apps/Apps.xcworkspace and build and run the DebugApp target.

You must provide a Mapbox access token to display Mapbox-hosted maps in the DebugApp test application. Add your Mapbox token to the MBXAccessToken key in DebugApp/DebugApp/Info.plist. Alternatively, create a file at ~/mapbox containing your access token.

CircleCI

CircleCI's YAML format can be picky. You can run make validate to ensure you've formatted the changes to the config file correctly. This make target will install the CircleCI command line interface to validate .circleci/config.yml, and run circleci config validate

Testing

Unit Testing on devices

To run device tests there are few options:

  1. Run via Xcode:
  • Install xcodegen.
  • Run $ xcodegen in the root of the repo.
  • Open the resulting MapboxMaps.xcodeproj.
  • Test (Cmd-U) the MapboxTestHost scheme.
  1. Trigger via CI by manual approve of optional-tests workflow. These tests also run "nightly".

Integration Tests

Integration tests typically test the integration between components. As such most will require a MapView.

Since these tests require a map view, they also need a UIWindow and Metal rendering to work. For both testing scenarios, if there's no valid Metal device the test will be skipped (i.e. not failure/success).

What happens if I run from MapboxTestHost?

There is a host application, so MapViewIntegrationTestCase fetches the existing window and view controller before adding the MapView to it.

  • These tests can be run on devices.
  • Tests will be skipped on simulators < iOS 13 because there's no valid Metal device. (iOS 13+ has a simulated Metal device.)

What happens if I run from MapboxMaps

There is no host application, so MapViewIntegrationTestCase creates its own UIWindow and root view controller, before adding the MapView to it.

  • These tests cannot be run on devices.
  • Tests will be skipped on simulators < iOS 13 because there's no valid Metal device.
  • Tests will be skipped entirely on CircleCI because of the VM (no Metal). So for CI purposes, integration tests should be run on Firebase Test Lab via MapboxTestHost

As you can see the most useful case is to run within from the host application. Be aware that this has the potential for side-effects, since the application is not restarted for each test.

Base classes

  • IntegrationTestCase is a base class that fetches the access token either from the Info.plist or from UserDefaults (which will override). The Info.plist in MapboxMaps has been set up to use the variable MAPBOX_ACCESS_TOKEN. Please add a developer.xcconfig in the root of the repo, that looks like:

    MAPBOX_ACCESS_TOKEN = pk.myaccesstoken

    The CircleCI config file has been set up to create this.

  • MapViewIntegrationTestCase subclasses the above, and sets the MapView, and is the MBXMapViewDelegate. Closures are used to expose these callbacks to subclasses. Please don't add tests to this class.

  • ExampleIntegrationTest is an example of using the above, that sets a style then waits for the load to finish.

Application Testing

Making an Example

  • Check out this doc to get more information about adding examples to our project.