Powerful Command-Line Applications in Go

Testing the Basic Word Counter

Go lets you test your code automatically without requiring external tools or frameworks. You’ll learn more about how to test your command-line applications throughout the book. Right now, let’s write a basic test for the word counter to ensure that it correctly counts the words in the given input.

Create a file called main_test.go in the same directory as your main.go file. Include the following content, which defines a testing function that tests the count function you’ve already defined in the main program:

firstProgram/wc/main_test.go

package main

import (
  "bytes"
  "testing"
)

// TestCountWords tests the count function set to count words
func TestCountWords(t *testing.T) {
 b := bytes.NewBufferString( ...