Fix CppUnit assert call

Storing it in a variable first seems to work. Don't know why.

Contributes to issue CURA-891.

CMakeLists.txt

@@ -115,6 +115,7 @@ set(engine_TEST_UTILS
     BucketGrid2DTest
     LinearAlg2DTest
     PolygonUtilsTest
+    PolygonTest
 )
 
 # Generating ProtoBuf protocol

tests/utils/PolygonTest.cpp

@@ -0,0 +1,43 @@
+//Copyright (c) 2016 Ultimaker B.V.
+//CuraEngine is released under the terms of the AGPLv3 or higher.
+
+#define LARGE_TEST_SIZE 10000
+
+#include "PolygonTest.h"
+
+
+namespace cura
+{
+    CPPUNIT_TEST_SUITE_REGISTRATION(PolygonTest);
+
+void PolygonTest::setUp()
+{
+    ClipperLib::Path small_path;
+    small_polygon = PolygonRef(small_path);
+    small_polygon.emplace_back(0, 0);
+    small_polygon.emplace_back(0, 100);
+    small_polygon.emplace_back(100, 100);
+    small_polygon.emplace_back(100, 0);
+
+    ClipperLib::Path large_path;
+    large_polygon = PolygonRef(large_path);
+    for (size_t vertex_id = 0; vertex_id < LARGE_TEST_SIZE; ++vertex_id)
+    {
+        large_polygon.emplace_back(vertex_id % 2 * 1000, vertex_id * 10); //Creates a sawtooth shape.
+    }
+    large_polygon.emplace_back(-10, LARGE_TEST_SIZE * 10 + 10);
+    large_polygon.emplace_back(-10, 0);
+}
+
+void PolygonTest::tearDown()
+{
+    //Nothing to do. The polygons don't need changing.
+}
+
+void PolygonTest::insideTest()
+{
+    bool test = small_polygon.inside(Point(50, 50));
+    CPPUNIT_ASSERT(test);
+}
+
+}

tests/utils/PolygonTest.h

@@ -0,0 +1,44 @@
+//Copyright (c) 2016 Ultimaker B.V.
+//CuraEngine is released under the terms of the AGPLv3 or higher.
+
+#ifndef POLYGONTEST_H
+#define	POLYGONTEST_H
+
+#include <clipper/clipper.hpp> //To create the paths.
+#include <cppunit/TestFixture.h> //Making unit tests.
+#include <cppunit/extensions/HelperMacros.h>
+
+#include "../src/utils/polygon.h" //The polygon we're testing.
+
+namespace cura
+{
+
+class PolygonTest : public CppUnit::TestFixture
+{
+    CPPUNIT_TEST_SUITE(PolygonTest);
+    CPPUNIT_TEST(insideTest);
+    CPPUNIT_TEST_SUITE_END();
+
+public:
+    /*!
+     * \brief Sets up the test suite to prepare for testing.
+     */
+    void setUp();
+
+    /*!
+     * \brief Tears down the test suite when testing is done.
+     */
+    void tearDown();
+
+    //The actual test cases.
+    void insideTest();
+
+private:
+    Polygon small_polygon;
+    Polygon large_polygon;
+};
+
+}
+
+#endif	/* POLYGONTEST_H */
+