util_test: Don’t crash when run from the wrong location

util/net/http_transport_test.cc

Index: util/net/http_transport_test.cc
diff --git a/util/net/http_transport_test.cc b/util/net/http_transport_test.cc
index 974e9f05411a1152b7c69e9593e94c2043220cd7..648501c15d701dcb9b676953f8f47fb58fdca768 100644
--- a/util/net/http_transport_test.cc
+++ b/util/net/http_transport_test.cc
@@ -58,9 +58,11 @@ class HTTPTransportTestFixture : public MultiprocessExec {
  private:
   void MultiprocessParent() override {
     // The child will write the HTTP server port number as a packed unsigned
-    // short to stdout.
+    // short to stdout. Use LoggingReadFD() instead of CheckedReadFD() for the
+    // first read so that the test can fail gracefully with a gtest assertion
+    // if the child does not execute properly.
     uint16_t port;
-    CheckedReadFD(ReadPipeFD(), &port, sizeof(port));
+    ASSERT_TRUE(LoggingReadFD(ReadPipeFD(), &port, sizeof(port)));
 
     // Then the parent will tell the web server what response code to send
     // for the HTTP request.