New function GetReason to get HTTP reason phrase from an http.Request

http/reason.go

@@ -0,0 +1,14 @@
+package http
+
+import (
+	"net/http"
+	"strings"
+)
+
+func GetReason(r *http.Response) string {
+	if i := strings.IndexByte(r.Status, ' '); i != -1 {
+		return r.Status[i+1:]
+	} else {
+		return ""
+	}
+}

http/reason_test.go

@@ -0,0 +1,48 @@
+package http
+
+import (
+	nethttp "net/http"
+	"testing"
+)
+
+func TestEmptyStringIsEmptyReason(t *testing.T) {
+	r := &nethttp.Response{Status: ""}
+	if GetReason(r) != "" {
+		t.Errorf("We consider an empty status line to have an empty reason")
+	}
+}
+
+func TestOnlyCodeIsEmptyReason(t *testing.T) {
+	r := &nethttp.Response{Status: "200"}
+	if GetReason(r) != "" {
+		t.Errorf("We consider an status line with just the status code to have an empty reason")
+	}
+}
+
+func TestOnlyCodePlusSpaceIsEmptyReason(t *testing.T) {
+	r := &nethttp.Response{Status: "200 "}
+	if GetReason(r) != "" {
+		t.Errorf("We consider an status line with just the status code to have an empty reason")
+	}
+}
+
+func TestOneWordReason(t *testing.T) {
+	r := &nethttp.Response{Status: "200 FOO"}
+	if GetReason(r) != "FOO" {
+		t.Errorf("Unexpected reason found")
+	}
+}
+
+func TestMultiWordReason(t *testing.T) {
+	r := &nethttp.Response{Status: "200 FOO BAR BAZ"}
+	if GetReason(r) != "FOO BAR BAZ" {
+		t.Errorf("Unexpected reason found")
+	}
+}
+
+func TestOddSizeStatusCode(t *testing.T) {
+	r := &nethttp.Response{Status: "2 FOO BAR BAZ"}
+	if GetReason(r) != "FOO BAR BAZ" {
+		t.Errorf("Unexpected reason found")
+	}
+}