version: 2.1

jobs:
  test:
    parameters:
      version:
        type: string
        default: "latest"
    docker:
      - image: cimg/go:<<parameters.version>>
    environment:
      TEST_RESULTS: /tmp/test-results
      GOROOT: ""
      GOPATH: "${HOME}/${CIRCLE_PROJECT_REPONAME}"
      REPO_PATH: "${GOPATH}/src/github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}"
    working_directory: ${CIRCLE_PROJECT_REPONAME}
    steps:
      - checkout
      - run:
          name: Print Go version (go version)
          command: |
            go version
      - run:
          name: Run tests
          command: |
            mkdir -p $TEST_RESULTS
            go test -v ./... | go tool test2json > $TEST_RESULTS/test2json-output.json
            gotestsum --junitfile $TEST_RESULTS/gotestsum-report.xml
      - run:
          name: Calculate test coverage
          command: |
            mkdir -p $TEST_RESULTS
            go test -coverprofile=c.out ./... > /dev/null
            go tool cover -html=c.out -o coverage.html
            mv coverage.html $TEST_RESULTS
      - run:
          name: Lint (golint)
          command: |
            go install golang.org/x/lint/golint@latest
            golint -set_exit_status ./...
      - run:
          name: Enforce formatted code (go fmt)
          command: |
            ! go fmt ./... 2>&1 | read
      - run:
          name: Examine and report suspicious constructs (go vet)
          command: |
            go vet -v ./...
      - run:
          name: Calculate cyclomatic complexity (gocyclo)
          command: |
            go install github.com/fzipp/gocyclo/cmd/gocyclo@latest
            gocyclo -avg -over 15 ../${CIRCLE_PROJECT_REPONAME}
      - run:
          name: Check for unchecked errors (errcheck)
          command: |
            go install github.com/kisielk/errcheck@latest
            errcheck ./...
      - store_artifacts:
          path: /tmp/test-results
          destination: raw-test-output
      - store_test_results:
          path: /tmp/test-results

workflows:
  test:
    jobs:
      - test:
          matrix:
            parameters:
              version: ["1.18", "1.17", "1.10"]