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+// Copyright 2014 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file model/test_result.hpp
+/// Definition of the "test result" concept.
+
+#if !defined(MODEL_TEST_RESULT_HPP)
+#define MODEL_TEST_RESULT_HPP
+
+#include "model/test_result_fwd.hpp"
+
+#include <ostream>
+#include <string>
+
+namespace model {
+
+
+/// Representation of a single test result.
+///
+/// A test result is a simple pair of (type, reason).  The type indicates the
+/// semantics of the results, and the optional reason provides an extra
+/// description of the result type.
+///
+/// In general, a 'passed' result will not have a reason attached, because a
+/// successful test case does not deserve any kind of explanation.  We used to
+/// special-case this with a very complex class hierarchy, but it proved to
+/// result in an extremely-complex to maintain code base that provided no
+/// benefits.  As a result, we allow any test type to carry a reason.
+class test_result {
+    /// The type of the result.
+    test_result_type _type;
+
+    /// A description of the result; may be empty.
+    std::string _reason;
+
+public:
+    test_result(const test_result_type, const std::string& = "");
+
+    test_result_type type(void) const;
+    const std::string& reason(void) const;
+
+    bool good(void) const;
+
+    bool operator==(const test_result&) const;
+    bool operator!=(const test_result&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const test_result&);
+
+
+}  // namespace model
+
+#endif  // !defined(MODEL_TEST_RESULT_HPP)