name: Tests
on: [push, pull_request]
jobs:
  build:
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]
    runs-on: ${{ matrix.os }}

    steps:
      - name: Set up Go 1.13
        uses: actions/setup-go@v1
        with:
          go-version: 1.13

      - name: Check out code into the Go module directory
        uses: actions/checkout@v2

      - name: Verify dependencies
        shell: bash
        run: |
          go mod verify
          go mod download

      - name: Run tests
        shell: bash
        run: |
          assert-nothing-changed() {
            local diff
            git checkout -- .
            "$@" >/dev/null || true
            if ! diff="$(git diff -U1 --color --exit-code)"; then
              printf '\n\e[31mError: running `\e[1m%s\e[22m` results in modifications that you must check into version control:\e[0m\n%s\n' "$*" "$diff" >&2
              return 1
            fi
          }

          STATUS=0
          go test -race ./... || STATUS=$?
          assert-nothing-changed go fmt ./... || STATUS=$?
          assert-nothing-changed go mod tidy || STATUS=$?
          exit $STATUS

      - name: Build
        run: go build -v ./cmd/gh