Add default returns to MockSendAlgorithm bandwidth calls

This CL prevents test crashes when these methods were called.

gfe-relnote: n/a, test-only
PiperOrigin-RevId: 304264740
Change-Id: I08ae2baec05eaa04665099ab3c7265f544d8b61d

quic/test_tools/quic_test_utils.cc

diff --git a/quic/test_tools/quic_test_utils.cc b/quic/test_tools/quic_test_utils.cc
index 3aec86e..d8a0436 100644
--- a/quic/test_tools/quic_test_utils.cc
+++ b/quic/test_tools/quic_test_utils.cc
@@ -784,7 +784,12 @@
 
 MockPacketWriter::~MockPacketWriter() {}
 
-MockSendAlgorithm::MockSendAlgorithm() {}
+MockSendAlgorithm::MockSendAlgorithm() {
+  ON_CALL(*this, PacingRate(_))
+      .WillByDefault(testing::Return(QuicBandwidth::Zero()));
+  ON_CALL(*this, BandwidthEstimate())
+      .WillByDefault(testing::Return(QuicBandwidth::Zero()));
+}
 
 MockSendAlgorithm::~MockSendAlgorithm() {}