I will be following TDD approach, where I write the test first, and then write the main code to make it pass eventually

• Test file : xxx_test.go
• Test func : TestXxx
• Benchmark : BenchmarkXxx
• Example : ExampleXxx
• Custom Test runner: TestMain

• Follow the AAA rule for EACH test
  • Arrange
  • Act
  • Assert (assert only one set of actions)
• DRY (Don't Repeat Yourself) also applies to Tests

• t.Error() = t.Log()+t.Fail() //t.Fail() fails the current test but continues with rest of the tests
• t.Fatal() = t.Log()+t.FailNow() // t.Fatal() and t.FailNow() fails & stops ALL the tests

• go test //for normal testing in the current dir
• go test -v //for verbose output
• go test <package_name> // to test the package
• go test -run <func_name> //to run tests only on a specific function instead of the whole file
• go test -timeout <duration> //times out & panics the test if not finished in the specified timeout i.e. 2s, 1m, etc.
• go test -v -short//Skip some long running tests (Goes with if testing.Short(){t.Skip("Skipping")} in the Test func)

• go test -cover //to see test coverage
• go test -coverprofile=coverage.out; go tool cover -html=coverage.out //this will open a html in browser with showing which lines of code are covered in green (and not covered with red) (sample image below)

• go test -bench . //run benchmark in the current dir
• go test -v -bench . //verbose