TDD with Go

DO Learn Go with tests

Environments

• mise 2025.10.4
• go 1.25.6
• golangci-lint v2.11.4
• gotestsum v1.13.0

Setup

• Installation of golangci-lint

go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.11.4
golangci-lint --version
# golangci-lint has version 2.11.4 built with go1.25.6 from (unknown, modified: ?, mod sum: "h1:GK+UlZBN5y7rh2PBnHA93XLSX6RaF7uhzJQ3JwU1wuA=") on (unknown)

• Installation of gotestsum

go install gotest.tools/gotestsum@v1.13.0
gotestsum --version
# gotestsum version v1.13.0

Run test

GO FUNDAMENTALS

• Hello, world!

go test ./greeting

• Integers

go test ./integers
go test -v ./integers

# See example with below command:
godoc -http :8000
# godoc: http://localhost:8000/pkg/github.com/nukopy/tdd-with-go/integers/

• Iteration

go test ./iteration

References

• Learn Go with tests
• Go by Example
• github.com/traPtitech/traQ
  • traQ - traP Internal Messenger Application Backend
• github.com/traPtitech/go-traq
  • Go client library for the traQ API