Prepare ntcore for merge into allwpilib.

ntcore/src/test/native/cpp/MessageMatcher.cpp

@@ -0,0 +1,52 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2017-2018. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "MessageMatcher.h"
+
+namespace nt {
+
+bool MessageMatcher::MatchAndExplain(
+    std::shared_ptr<Message> msg,
+    ::testing::MatchResultListener* listener) const {
+  bool match = true;
+  if (!msg) return false;
+  if (msg->str() != goodmsg->str()) {
+    *listener << "str mismatch ";
+    match = false;
+  }
+  if ((!msg->value() && goodmsg->value()) ||
+      (msg->value() && !goodmsg->value()) ||
+      (msg->value() && goodmsg->value() &&
+       *msg->value() != *goodmsg->value())) {
+    *listener << "value mismatch ";
+    match = false;
+  }
+  if (msg->id() != goodmsg->id()) {
+    *listener << "id mismatch ";
+    match = false;
+  }
+  if (msg->flags() != goodmsg->flags()) {
+    *listener << "flags mismatch";
+    match = false;
+  }
+  if (msg->seq_num_uid() != goodmsg->seq_num_uid()) {
+    *listener << "seq_num_uid mismatch";
+    match = false;
+  }
+  return match;
+}
+
+void MessageMatcher::DescribeTo(::std::ostream* os) const {
+  PrintTo(goodmsg, os);
+}
+
+void MessageMatcher::DescribeNegationTo(::std::ostream* os) const {
+  *os << "is not equal to ";
+  PrintTo(goodmsg, os);
+}
+
+}  // namespace nt