The Go Programming Language

11.2 Test Functions

Each test file must import the testing package. Test functions have the following signature:

func TestName(t *testing.T) {
    // ...
}

Test function names must begin with Test; the optional suffix Name must begin with a capital letter:

Click here to view code image

func TestSin(t *testing.T) { /* ... */ }
func TestCos(t *testing.T) { /* ... */ }
func TestLog(t *testing.T) { /* ... */ }

The t parameter provides methods for reporting test failures and logging additional information. Let’s define an example package gopl.io/ch11/word1, containing a single function IsPalindrome that reports whether a string reads the same forward and backward. (This implementation tests every byte twice if the string is a palindrome; we’ll come ...