Added BOOST_TEST_WITH macro to verify test results with custom predicate

test/lightweight_test_with_test.cpp

@@ -0,0 +1,41 @@
+//
+// Test for BOOST_TEST_WITH
+//
+// Copyright (c) 2020 Bjorn Reese
+//
+// Distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt
+//
+
+#include <cmath>
+#include <functional>
+#include <vector>
+#include <boost/core/lightweight_test.hpp>
+
+template <typename T>
+struct with_tolerance
+{
+    with_tolerance(T tolerance) : tolerance(tolerance) {}
+    bool operator()(T lhs, T rhs)
+    {
+        return (std::abs(lhs - rhs) <= tolerance);
+    }
+
+private:
+    T tolerance;
+};
+
+void test_tolerance_predicate()
+{
+    BOOST_TEST_WITH( 1.0, 1.0, with_tolerance<double>(1e-5) );
+    BOOST_TEST_WITH( 1.0, 1.0 - 1e-6, with_tolerance<double>(1e-5) );
+    BOOST_TEST_WITH( 1.0, 1.0 + 1e-6, with_tolerance<double>(1e-5) );
+}
+
+int main()
+{
+    test_tolerance_predicate();
+
+    return boost::report_errors();
+}