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main_test.go
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package main
import (
"bytes"
"fmt"
"io/ioutil"
"net/http"
"net/http/httptest"
"reflect"
"testing"
)
var (
baseUrl = "http://www.example.com"
noAnchorsHtml = `<html>
<body>
Hello world!
</body>
</html>`
oneAnchorHtml = fmt.Sprintf(`
<html>
<body>
<a href="%v%v">Link</a>
</body>
</html>`, baseUrl, "/best")
twoAnchorHtml = fmt.Sprintf(`
<html>
<body>
<a href="%v%v">Link1</a>
<a href="%v%v">Link2</a>
</body>
</html>`, baseUrl, "/best", baseUrl, "/test")
)
func NewTestServer(address string, routes map[string]string) *httptest.Server {
mux := http.NewServeMux()
for path, html := range routes {
mux.HandleFunc(path, func(rw http.ResponseWriter, r *http.Request) {
rw.Write([]byte(html))
})
}
ts := httptest.NewServer(mux)
return ts
}
func checkLen(t *testing.T, items interface{}, expected int) {
listVal := reflect.ValueOf(items)
if listVal.Len() != expected {
t.Log("Expected", expected, "items. Got", listVal.Len())
t.Fail()
}
}
func Test_IsValidUrl(t *testing.T) {
res := isValidUrl("")
if res {
t.Fail()
}
res = isValidUrl("adbcd")
if res {
t.Fail()
}
res = isValidUrl("https://")
if res {
t.Fail()
}
res = isValidUrl("www.google.com")
if res {
t.Fail()
}
res = isValidUrl(baseUrl)
if !res {
t.Fail()
}
}
func Test_ParseArgs(t *testing.T) {
_, err := parseArgs([]string{})
if err == nil {
t.Fail()
}
_, err = parseArgs([]string{"program", "google.com"})
if err == nil {
t.Fail()
}
opts, _ := parseArgs([]string{"program", "http://www.google.com"})
if opts == nil {
t.Fail()
}
opts, _ = parseArgs([]string{"program", "http://www.google.com", "10"})
if opts.maxCrawls != 10 {
fmt.Println(opts)
t.Fail()
}
}
func Test_ParseResponse(t *testing.T) {
resp := &http.Response{
Body: ioutil.NopCloser(bytes.NewBufferString(noAnchorsHtml)),
}
urls := parseResponse(resp)
checkLen(t, urls, 0)
resp = &http.Response{
Body: ioutil.NopCloser(bytes.NewBufferString(oneAnchorHtml)),
}
urls = parseResponse(resp)
checkLen(t, urls, 1)
resp = &http.Response{
Body: ioutil.NopCloser(bytes.NewBufferString(twoAnchorHtml)),
}
urls = parseResponse(resp)
checkLen(t, urls, 2)
}
func Test_ScrapeUrl(t *testing.T) {
ts1 := NewTestServer(baseUrl, map[string]string{"/": noAnchorsHtml})
urls := scrapeUrl(ts1.URL)
checkLen(t, urls, 0)
defer ts1.Close()
ts2 := NewTestServer(baseUrl, map[string]string{"/": twoAnchorHtml})
defer ts2.Close()
urls = scrapeUrl(ts2.URL)
checkLen(t, urls, 2)
}