Make mixing test die earlier on failure instead of spamming errors

webrtc/voice_engine/test/auto_test/standard/mixing_test.cc

Index: webrtc/voice_engine/test/auto_test/standard/mixing_test.cc
diff --git a/webrtc/voice_engine/test/auto_test/standard/mixing_test.cc b/webrtc/voice_engine/test/auto_test/standard/mixing_test.cc
index b7f7d560d73d6dcf87631b56d36a2e7b96950462..fcee2f707b241e2a3c461e191939a3edaba82863 100644
--- a/webrtc/voice_engine/test/auto_test/standard/mixing_test.cc
+++ b/webrtc/voice_engine/test/auto_test/standard/mixing_test.cc
@@ -129,8 +129,8 @@ class MixingTest : public AfterInitializationFixture {
       std::ostringstream trace_stream;
       trace_stream << samples_read << " samples read";
       SCOPED_TRACE(trace_stream.str());
-      EXPECT_LE(output_value, max_output_value);
-      EXPECT_GE(output_value, min_output_value);
+      ASSERT_LE(output_value, max_output_value);
+      ASSERT_GE(output_value, min_output_value);
     }
     // Ensure we've at least recorded half as much file as the duration of the
     // test. We have to use a relaxed tolerance here due to filesystem flakiness