Example .travis.yml for Golang with CodeCov.io integration

.travis.yml

language: go

# Only the last two Go releases are supported by the Go team with security
# updates. Any versions older than that should be considered deprecated.
# Don't bother testing with them. tip builds your code with the latest
# development version of Go. This can warn you that your code will break
# in the next version of Go. Don't worry! Later we declare that test runs
# are allowed to fail on Go tip.
go:
  - 1.9
  - release
  - tip

# Skip the install step. Don't `go get` dependencies. Only build with the
# code in vendor/
install: true

matrix:
  # It's ok if our code fails on unstable development versions of Go.
  allow_failures:
    - go: tip
  # Don't wait for tip tests to finish. Mark the test run green if the
  # tests pass on the stable versions of Go.
  fast_finish: true

# Don't email me the results of the test runs.
notifications:
  email: false

# Anything in before_script that returns a nonzero exit code will
# flunk the build and immediately stop. It's sorta like having
# set -e enabled in bash. 
before_script:
  - GO_FILES=$(find . -iname '*.go' -type f | grep -v /vendor/) # All the .go files, excluding vendor/
  - go get github.com/golang/lint/golint                        # Linter
  - go get honnef.co/go/tools/cmd/megacheck                     # Badass static analyzer/linter
  - go get github.com/fzipp/gocyclo

# script always run to completion (set +e). All of these code checks are must haves
# in a modern Go project.
script:
  - test -z $(gofmt -s -l $GO_FILES)         # Fail if a .go file hasn't been formatted with gofmt
  - go test -race -coverprofile=coverage.txt -covermode=atomic  # Run all the tests with the race detector enabled
  - go vet ./...                             # go vet is the official Go static analyzer
  - megacheck ./...                          # "go vet on steroids" + linter
  - gocyclo -over 19 $GO_FILES               # forbid code with huge functions
  - golint -set_exit_status $(go list ./...) # one last linter

# push results to CodeCov
after_success:
  - bash <(curl -s https://codecov.io/bash)