我正在嘗試運行并測試此代碼，但缺少 selenium 并且我無法將其安裝在我的系統(tǒng)中，在這種情況下我該怎么辦？ERROR: while executetest.go:8:2: import "bitbucket.org/tebeka/selenium": cannot find packageINSTALL the package i tried:# apt-get install goisntallReading package lists... DoneBuilding dependency tree       Reading state information... DoneE: Unable to locate package goisntall# apt-cache search goinstallgolang-src - Go programming language compiler - source filesCODE: testing/* Selenium example goinstall bitbucket.org/tebeka/selenium */package yahooimport (  "strings"  "testing"  "bitbucket.org/tebeka/selenium")func TestYahoo(t *testing.T) {    /* We want firefox, don't care about version much */    caps := selenium.Capabilities {        "browserName": "firefox",    }    wd, _ := selenium.NewRemote(caps, "", "")    defer wd.Quit()    /* Navigate to Yahoo */    wd.Get("http://www.yahoo.com")    /* Fill the search box */    input, err := wd.FindElement(selenium.ByName, "p")    if err != nil {        t.Error(err.String())    }    err = input.SendKeys("golang")    if err != nil {        t.Error(err.String())    }    /* Hit the search button */    button, err := wd.FindElement(selenium.ById, "search-submit")    if err != nil {        t.Error(err.String())    }    err = button.Click()    if err != nil {        t.Error(err.String())    }    /* See that we get expected result */    source, err := wd.PageSource()    if err != nil {        t.Error(err.String())    }    if !strings.Contains(source, "The Go Programming Language") {        t.Error("Google can't find Go")    }}