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diff --git a/fuzzylite/test/variable/VariableTest.cpp b/fuzzylite/test/variable/VariableTest.cpp
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+++ b/fuzzylite/test/variable/VariableTest.cpp
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+/*
+ fuzzylite (R), a fuzzy logic control library in C++.
+ Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
+ Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the FuzzyLite License included with the software.
+
+ You should have received a copy of the FuzzyLite License along with
+ fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
+
+ fuzzylite is a registered trademark of FuzzyLite Limited.
+ */
+
+#include "test/catch.hpp"
+#include "fl/Headers.h"
+
+#include <algorithm>    // std::random_shuffle
+
+namespace fl {
+
+    /**
+     * Tests: variable/Variable
+     *
+     * @author Juan Rada-Vilela, Ph.D.
+     *
+     */
+
+    TEST_CASE("variable of Constant terms is sorted", "[variable][variable]") {
+        Variable variable("Variable", -10, 10);
+        for (int i = 0; i <= 20; ++i) {
+            variable.addTerm(new Constant(Op::str(i), i - 10));
+        }
+        std::random_shuffle(variable.terms().begin(), variable.terms().end());
+        FL_DBG(variable.toString());
+        REQUIRE(variable.numberOfTerms() == 21);
+        variable.sort();
+        REQUIRE(variable.numberOfTerms() == 21);
+        int value = -10;
+        for (std::size_t i = 0; i < variable.terms().size(); ++i) {
+            Constant* term = dynamic_cast<Constant*> (variable.terms().at(i));
+            REQUIRE(term);
+            REQUIRE(term->getValue() == float(value));
+            ++value;
+        }
+        FL_DBG(variable.toString());
+    }
+
+    TEST_CASE("variable of Triangle terms is sorted", "[variable][variable]") {
+        Variable variable("Variable", -30, 30);
+        for (int i = 0; i <= 20; ++i) {
+            variable.addTerm(new Triangle(Op::str(i), i - 1, i, i + 1));
+        }
+        std::random_shuffle(variable.terms().begin(), variable.terms().end());
+        FL_DBG(variable.toString());
+        REQUIRE(variable.numberOfTerms() == 21);
+        variable.sort();
+        FL_DBG("Shuffled:");
+        FL_DBG(variable.toString());
+        REQUIRE(variable.numberOfTerms() == 21);
+        int value = 0;
+        for (std::size_t i = 0; i < variable.terms().size(); ++i) {
+            Triangle* term = dynamic_cast<Triangle*> (variable.terms().at(i));
+            REQUIRE(term);
+            REQUIRE(term->getName() == Op::str(value < 0 ? -1 * value : value));
+            ++value;
+        }
+        FL_DBG(variable.toString());
+    }
+
+}
+