第4章_测试与性能调优

4-1测试.mp4

传统测试vs表格驱动测试

传统测试

• 测试数据和测试逻辑混在一起
• 出错信息不明确

• —旦一个数据出错测试全部结束

  表格驱动测试

  

• 分离的测试数据和测试逻辑

• 明确的出错信息
• 可以部分失败
• go语言的语法使得我们更易实践表格驱动测试 ``` package main

import “testing”

func TestTriangle(t *testing.T){ tests := []struct{a,b,c int }{ {3,4,5}, {5,12,13}, {8,15,17}, {12,35,37}, {30000,40000,52000}, }

for _,tt:=range tests{
    if actual:= calcTriangle(tt.a,tt.b); actual !=tt.c{
        t.Errorf("calcTriang %d %d got %d ; exceped",tt.a,tt.b,tt.c)
    }
}

}

```
=== RUN   TestTriangle
    add_test.go:16: calcTriang 30000 40000 got 52000 ; exceped
--- FAIL: TestTriangle (0.00s)
FAIL
Process finished with the exit code 1

4-2代码覆盖率和性能测试.mp4

go test -coverprofile=c.out
go test -coverprofile=c.out .
go tool pprof cpu.out
go tool pprof -cpuprofile cpu.out

4-3使用pprof进行性能调优.mp4

4-4测试http服务器（上）.mp4

4-5测试http服务器（下）.mp4

package main
import (
    "errors"
    "fmt"
    "io/ioutil"
    "net/http"
    "net/http/httptest"
    "os"
    "strings"
    "testing"
)
func errPanic(writer http.ResponseWriter, request *http.Request) error {
    panic(123)
}
type testingUserError string
func (e testingUserError) Error() string {
    return e.Message()
}
func (e testingUserError) Message() string {
    return string(e)
}
func errUserError(writer http.ResponseWriter, request *http.Request) error {
    return testingUserError("user error")
}
func errNotFound(writer http.ResponseWriter, request *http.Request) error {
    return os.ErrNotExist
}
func errNoPermission(writer http.ResponseWriter, request *http.Request) error {
    return os.ErrPermission
}
func errUnknown(writer http.ResponseWriter, request *http.Request) error {
    return errors.New("unknown error")
}
func noError(writer http.ResponseWriter, request *http.Request) error {
    fmt.Fprintln(writer, "no error")
    return nil
}
func TestErrWrapper(t *testing.T) {
    tests := []struct {
        h       appHandler
        code    int
        message string
    }{
        {errPanic, 500, "Internal Server Error"},
        {errUserError, 400, "user error"},
        {errNotFound, 404, "Not Found"},
        {errNoPermission, 403, "Forbidden"},
        {errUnknown, 500, "Internal Server Error"},
        {noError, 200, "no error"},
    }
    for _, tt := range tests {
        f := errWrapper(tt.h)
        response := httptest.NewRecorder()
        request := httptest.NewRequest(
            http.MethodGet,
            "http://localhost:8888/list/fib2.txt",
            nil,
        )
        f(response, request)
        b, _ := ioutil.ReadAll(response.Body)
        body := strings.Trim(string(b), "\n")
        if response.Code != tt.code ||
            body != tt.message {
            t.Errorf("expect (%d, %s)"+
                "expect (%d, %s);\"",
                tt.code,
                tt.message,
                response.Code,
                body,
            )
        }
    }
}
/**
=== RUN   TestErrWrapper
time="2021-10-26T20:55:25+08:00" level=info msg="Painic: 123"
--- PASS: TestErrWrapper (0.02s)
PASS
Process finished with the exit code 0
API server listening at: 127.0.0.1:50219
=== RUN   TestErrWrapper
--- PASS: TestErrWrapper (0.00s)
PASS
Debugger finished with the exit code 0
API server listening at: 127.0.0.1:50243
=== RUN   TestErrWrapper
--- PASS: TestErrWrapper (0.00s)
PASS
Debugger finished with the exit code 0
*/

函数是一等公民

func TestErrWrapperInServer(t *testing.T) {
    for _, tt := range tests {
        f := errWrapper(tt.h)
        server := httptest.NewServer(
            http.HandlerFunc(f))
        resp, _ := http.Get(server.URL)
        b, _ := ioutil.ReadAll(resp.Body)
        body := strings.Trim(string(b), "\n")
        if resp.StatusCode != tt.code ||
            body != tt.message {
            t.Errorf("expect (%d, %s)"+
                "expect (%d, %s);\"",
                tt.code,
                tt.message,
                resp.StatusCode,
                body,
            )
        }
    }
}
/**
=== RUN   TestErrWrapperInServer
--- PASS: TestErrWrapperInServer (0.00s)
PASS
Process finished with the exit code 0
 */

• 通过testing库里面的 http假的request
• 这种更像单元测试

• 通过启动http服务来进行测试
• 这种更加的全面

4-6生成文档和示例代码.mp4

godoc -http :6060

package queue
import "fmt"
func ExampleQueue_Pop() {
    q := Queue{1}
    q.Push(2)
    q.Push(3)
    fmt.Println(q.Pop())
    fmt.Println(q.Pop())
    fmt.Println(q.IsEmpty())
    fmt.Println(q.Pop())
    fmt.Println(q.IsEmpty())
    // Output:
    // 1
    // 2
    // false
    // 3
    // true
}