Use IsStreamError() and friends gMock matchers in a few tests.

gfe-relnote: n/a, test-only change.
PiperOrigin-RevId: 282776774
Change-Id: I5a8ac676cbc01c9999115f2d8f1ba54cfb28d1cb
diff --git a/quic/test_tools/quic_stream_sequencer_buffer_peer.cc b/quic/test_tools/quic_stream_sequencer_buffer_peer.cc
index 36d2b04..b3bf224 100644
--- a/quic/test_tools/quic_stream_sequencer_buffer_peer.cc
+++ b/quic/test_tools/quic_stream_sequencer_buffer_peer.cc
@@ -7,6 +7,7 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
+#include "net/third_party/quiche/src/quic/test_tools/quic_test_utils.h"
 
 typedef quic::QuicStreamSequencerBuffer::BufferBlock BufferBlock;
 
@@ -28,8 +29,8 @@
   dest.iov_base = dest_buffer, dest.iov_len = size;
   size_t bytes_read;
   std::string error_details;
-  EXPECT_EQ(QUIC_NO_ERROR,
-            buffer_->Readv(&dest, 1, &bytes_read, &error_details));
+  EXPECT_THAT(buffer_->Readv(&dest, 1, &bytes_read, &error_details),
+              IsQuicNoError());
   return bytes_read;
 }