added tests

main_test.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"regexp"
+	"strconv"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var srv *httptest.Server
+
+func TestMain(m *testing.M) {
+	srv = httptest.NewServer(http.HandlerFunc(probeHandler))
+	defer srv.Close()
+	m.Run()
+}
+
+func TestSuccessQueries(t *testing.T) {
+	var re = regexp.MustCompile("(?m)^domain_expiry_days ([0-9]+)$")
+	for _, domain := range []string{
+		"carlosbecker.com",
+		"carinebecker.com",
+		"watchub.pw",
+		"google.com",
+	} {
+		t.Run(domain, func(t *testing.T) {
+			var assert = assert.New(t)
+			var body = req(t, domain, http.StatusOK)
+			var results = re.FindStringSubmatch(string(body))
+			assert.Len(results, 2, "should have returned the metric in the body of the response")
+			days, err := strconv.Atoi(results[1])
+			assert.NoError(err)
+			assert.True(days > 0, "domain must not be expired")
+		})
+	}
+}
+
+func TestTargetNotProvided(t *testing.T) {
+	req(t, "", http.StatusBadRequest)
+}
+
+func TestTargetDoesntExist(t *testing.T) {
+	req(t, "this-domain-should-not-exist.blah", http.StatusBadRequest)
+}
+
+func req(t *testing.T, domain string, expectedStatus int) string {
+	var assert = assert.New(t)
+	resp, err := http.Get(fmt.Sprintf("%s?target=%s", srv.URL, domain))
+	assert.NoError(err)
+	assert.Equal(expectedStatus, resp.StatusCode)
+	body, err := ioutil.ReadAll(resp.Body)
+	assert.NoError(err)
+	return string(body)
+}