name: Coverage

on:
  workflow_run:
    workflows: ["CI"]
    types:
      - completed

jobs:
  coverage:
    name: coverage
    if: ${{ github.event.workflow_run.conclusion == 'success' }}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest]
        rust: [stable]
        args: ["", "--all-features"]
    steps:
    - name: Checkout repository
      uses: actions/checkout@v2
      with:
        # at the time of writing workflow_run.head_commit.id appears to be
        # the commit that triggered the CI workflow which then triggered us.
        ref: ${{ github.event.workflow_run.head_commit.id }}
    - name: Install Rust
      uses: hecrj/setup-rust-action@v1
      with:
        rust-version: ${{ matrix.rust }}
    - run: cargo install cargo-tarpaulin
    # use a long timeout with tarpaulin as UI tests have to docker pull the
    # cypress.io image which can cause a test timeout with the default tarpaulin
    # timeout of 1 minute.
    - run: cargo tarpaulin --locked --verbose --out Html --timeout 900 ${{ matrix.args }}
    - name: Archive code coverage results
      uses: actions/upload-artifact@v2
      with:
        name: code-coverage-report ${{ matrix.os }} ${{ matrix.rust }} ${{ matrix.args }}
        path: tarpaulin-report.html