GitHub Codespaces is the vscode-based cloud development environment for GitHub projects. We can use devcontainer to configure containers for GitHub Codespaces when opening Robolectric project from it.
As Robolectric there are special requirements for Android SDK and ANDROID_SDK_HOME environment variable for building, Robolectric selects Dockerfile to configure necessary Android environment for itself.
Any contributor can update it based on the demand. When we update Dockerfile, we can run the following command to build and test it locally:
cd .devcontainer docker buildx build .
See Docker's buildx repository to install buildx.
When local testing is passed, we can push it to remote custom branch, and checkout it with latest change in GitHub‘s Codespaces page and then trigger “Rebuild Container” to test its configuration in GitHub’s Codespaces environment.
If everything goes well, sending the PR and wait the merging.
Because devcontainer is brought by VSCode, this configuration can also be used for VSCode.