Example for blog post: Go bits: Magic with functions

functionsandinterfaces_test.go

package functionsandinterfaces_test

import (
   "testing"

   "github.com/matryer/is"

   . "go-bits/magic-with-functions/functionsandinterfaces"
)

func Test_isBigger_with_a_closure(t *testing.T) {
   // Arrange
   shouldBe := is.New(t)

   realFunction := RegisterCustomer
   castedFunction := ForRegisteringCustomersFunc(realFunction)
   handler := NewCustomerRegistrationHTTPHandler(castedFunction)

   // Act
   err := handler.Handle("John Doe", "[email protected]")

   // Assert
   shouldBe.NoErr(err)
}