Prepare ntcore for merge into allwpilib.

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

@@ -0,0 +1,42 @@
+/*----------------------------------------------------------------------------*/
+/* 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef NTCORE_MESSAGEMATCHER_H_
+#define NTCORE_MESSAGEMATCHER_H_
+
+#include <memory>
+#include <ostream>
+
+#include "Message.h"
+#include "TestPrinters.h"
+#include "gmock/gmock.h"
+
+namespace nt {
+
+class MessageMatcher
+    : public ::testing::MatcherInterface<std::shared_ptr<Message>> {
+ public:
+  explicit MessageMatcher(std::shared_ptr<Message> goodmsg_)
+      : goodmsg(goodmsg_) {}
+
+  bool MatchAndExplain(std::shared_ptr<Message> msg,
+                       ::testing::MatchResultListener* listener) const override;
+  void DescribeTo(::std::ostream* os) const override;
+  void DescribeNegationTo(::std::ostream* os) const override;
+
+ private:
+  std::shared_ptr<Message> goodmsg;
+};
+
+inline ::testing::Matcher<std::shared_ptr<Message>> MessageEq(
+    std::shared_ptr<Message> goodmsg) {
+  return ::testing::MakeMatcher(new MessageMatcher(goodmsg));
+}
+
+}  // namespace nt
+
+#endif  // NTCORE_MESSAGEMATCHER_H_