使用Go Test测试单个文件和单个方法

前置条件：

1、文件名须以"_test.go"结尾

2、方法名须以"Test"打头，并且形参为 (t *testing.T)

举例：/hello_test.go

package main
 
import (
    "testing"
    "fmt"
)
 
func TestHello(t *testing.T) {
    fmt.Println("TestHello")
}
 
func TestWorld(t *testing.T) {
    fmt.Println("TestWorld")
}

测试整个文件：$ go test -v hello_test.go

=== RUN   TestHello
TestHello
--- PASS: TestHello (0.00s)
=== RUN   TestWorld
TestWorld
--- PASS: TestWorld (0.00s)
PASS
ok      command-line-arguments  0.007s

测试单个函数：$ go test -v hello_test.go -test.run TestHello

=== RUN   TestHello
TestHello
--- PASS: TestHello (0.00s)
PASS
ok      command-line-arguments  0.008s