Learning Test-Driven Development with Go/

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Tests in Go

Tests in Go

Learn some of the test features in Go, including subtests, table-driven tests, and flags.

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Go has some fantastic features for tests that are worth mentioning.

Subtests

Subtests help us write more structured test code. Let’s use an example to understand this:

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package subtests
import (
	"fmt"
)
type Person struct {
	age int
}
func NewPerson(age int) (*Person, error) {
	if age < 0 {
		return nil, fmt.Errorf("age cannot be less than 0")
	}
	return &Person{age: age}, nil
}

For the rest of the lesson, we’ll rely on this production function for writing tests. The NewPerson function has two branches to cover:

  • The happy one is when we provide a valid age.
  • The bad one is when we pass an invalid age.

With that being said, we have to write two test functions that we’ll call TestNewPerson_WithValidAge and TestNewPerson_WithNotValidAge. ...