utils: add test for TimeoutConn

Docker-DCO-1.1-Signed-off-by: Johan Euphrosine <proppy@google.com> (github: proppy)

utils/timeoutconn_test.go

@@ -0,0 +1,33 @@
+package utils
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+)
+
+func TestTimeoutConnRead(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, "hello")
+	}))
+	defer ts.Close()
+	conn, err := net.Dial("tcp", ts.URL[7:])
+	if err != nil {
+		t.Fatalf("failed to create connection to %q: %v", ts.URL, err)
+	}
+	tconn := NewTimeoutConn(conn, 1*time.Second)
+
+	if _, err = bufio.NewReader(tconn).ReadString('\n'); err == nil {
+		t.Fatalf("expected timeout error, got none")
+	}
+	if _, err := fmt.Fprintf(tconn, "GET / HTTP/1.0\r\n\r\n"); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+	if _, err = bufio.NewReader(tconn).ReadString('\n'); err != nil {
+		t.Errorf("unexpected error: %v", err)
+	}
+}