Naming conventions ( prefix with underscore)
suffix with underscore with the filename. For example, the hello.go is the source file then hello.go with test package will have the filename hello_test.go tells the go test command that this file contains test functions.
hello_test.go
Testing package
Importing the testing package is a must to be included along with other imported packages such as the “fmt” package that it commonly in use.
import (
"testing"
)Test command
At the command line where the source code directory, run the go test command to execute the test
go test
Implement a Test Functions
Expect results of the function
Prefix the Test to the function name. For example, TestHelloName()
// TestHelloName calls greetings.Hello with a name, checking
// for a valid return value.
func TestHelloName(t *testing.T) {
name := "Gladys"
want := regexp.MustCompile(`\b`+name+`\b`)
msg, err := Hello("Gladys")
if !want.MatchString(msg) || err != nil {
t.Fatalf(`Hello("Gladys") = %q, %v, want match for %#q, nil`, msg, err, want)
}
}