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diff --git a/vendor/CppQuickCheck-2018-03-28/test/functional-tests.cpp b/vendor/CppQuickCheck-2018-03-28/test/functional-tests.cpp
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+/*
+ * Copyright (c) 2016, Philipp Classen 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.
+ *
+ * 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 HOLDERS 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.
+ */
+
+#include "cppqc.h"
+#include "catch.hpp"
+
+using namespace cppqc;
+
+namespace FunctionalTestsFixtures {
+
+struct MinimalPassingProperty : cppqc::Property<bool>
+{
+    bool check(const bool &v) const override
+    {
+        return true;
+    }
+    std::string name() const override
+    {
+        return "Dummy check (will always pass)";
+    }
+};
+
+struct MinimalFailingProperty : cppqc::Property<bool>
+{
+    bool check(const bool &v) const override
+    {
+        return false; // fails intentionally
+    }
+    std::string name() const override
+    {
+        return "Dummy check (will always fail)";
+    }
+};
+
+struct NontriviallyFailingProperty : cppqc::Property<std::vector<int>>
+{
+    bool check(const std::vector<int> &v) const override
+    {
+        if (v.size() >= 1 && (v[0] % 99) == 1) {
+            return false;
+        }
+
+        return true;
+    }
+};
+
+} // end FunctionalTestsFixtures
+
+TEST_CASE("minimal passing example",
+          "[functional]")
+{
+    const Result result =
+        quickCheckOutput(FunctionalTestsFixtures::MinimalPassingProperty{});
+
+    REQUIRE(result.result == QC_SUCCESS);
+}
+
+TEST_CASE("minimal failing example",
+          "[functional]")
+{
+    const Result result =
+        quickCheckOutput(FunctionalTestsFixtures::MinimalFailingProperty{});
+
+    REQUIRE(result.result == QC_FAILURE);
+}
+
+TEST_CASE("tests with fixed seeds must be repeatible",
+          "[functional][seed]")
+{
+    for (int i = 0; i < 100; i++) {
+        const auto seed = static_cast<SeedType>(i);
+
+        std::ostringstream output1;
+        const Result run1 =
+            quickCheckOutput(FunctionalTestsFixtures::NontriviallyFailingProperty{},
+                             output1, 100, 0, 0, DISABLE_SHRINK_TIMEOUT, seed);
+        REQUIRE(run1.seed == seed);
+
+        std::ostringstream output2;
+        const Result run2 =
+            quickCheckOutput(FunctionalTestsFixtures::NontriviallyFailingProperty{},
+                             output2, 100, 0, 0, DISABLE_SHRINK_TIMEOUT, seed);
+        REQUIRE(run2.seed == seed);
+
+        REQUIRE(run1.result == run2.result);
+        REQUIRE(output1.str() == output2.str());
+    }
+}