[GeoLib] Tests for GeoLib::checkParallelism().

Tests/GeoLib/TestCheckParallelism.cpp

+/**
+ * @file TestCheckParallelism.cpp
+ * @date Feb 26, 2014
+ *
+ * @copyright
+ * Copyright (c) 2014, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/LICENSE.txt
+ */
+
+#include "gtest/gtest.h"
+
+#include "AnalyticalGeometry.h"
+
+TEST(GeoLib, TestCheckParallelism)
+{
+	// parallel vectors
+	double v[3] = {0.0, 1.0, 2.0};
+	double w[3] = {0.0, 2.0, 4.0};
+	EXPECT_TRUE(GeoLib::checkParallelism(v,w));
+
+	v[1] = 0.0;
+	w[1] = 0.0;
+	EXPECT_TRUE(GeoLib::checkParallelism(v,w));
+
+	// degenerate cases
+	v[2] = 0.0;
+	w[2] = 0.0;
+	EXPECT_FALSE(GeoLib::checkParallelism(v,w));
+
+	w[2] = 0.1;
+	EXPECT_FALSE(GeoLib::checkParallelism(v,w));
+
+	// non-parallel case
+	v[1] = 0.1;
+	EXPECT_FALSE(GeoLib::checkParallelism(v,w));
+
+	// parallel vectors, opposite sense of direction
+	v[0] = 0.0; v[1] = 1.0; v[2] = 2.0;
+	w[0] = 0.0; w[1] = -2.0; w[2] = -4.0;
+	EXPECT_TRUE(GeoLib::checkParallelism(v,w));
+}
+