Replace cppunit with the googletest framework

The GTest framework has a more active support base, and natively
supports CMake. Introduce it as an external dependency (using CMake's
ExternalProject_Add), replacing cppunit and porting the associated unit
tests.

.travis.yml

@@ -1,5 +1,5 @@
 before_install:
-  - sudo apt-get install cmake libcppunit-dev python3
+  - sudo apt-get install cmake python3
 
 env:
   - TRAVIS_NO_EXPORT=YES

cmake-modules/AddGTest.cmake

@@ -0,0 +1,64 @@
+find_package(Threads REQUIRED)
+include(ExternalProject)
+
+if(MSYS OR MINGW)
+	set(DISABLE_PTHREADS ON)
+else()
+	set(DISABLE_PTHREADS OFF)
+endif()
+
+if (MSVC)
+	set(RELEASE_LIB_DIR ReleaseLibs)
+	set(DEBUG_LIB_DIR DebugLibs)
+else()
+	set(RELEASE_LIB_DIR "")
+	set(DEBUG_LIB_DIR "")
+endif()
+
+set(GTEST_CMAKE_ARGS
+	"-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
+	"-Dgtest_force_shared_crt=ON"
+	"-Dgtest_disable_pthreads:BOOL=${DISABLE_PTHREADS}")
+set(GTEST_RELEASE_LIB_DIR "")
+set(GTEST_DEBUGLIB_DIR "")
+if (MSVC)
+	set(GTEST_CMAKE_ARGS ${GTEST_CMAKE_ARGS}
+		"-DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG:PATH=${DEBUG_LIB_DIR}"
+		"-DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE:PATH=${RELEASE_LIB_DIR}")
+	set(GTEST_LIB_DIR)
+endif()
+
+set(GTEST_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/gtest")
+
+ExternalProject_Add(gtest
+	GIT_REPOSITORY https://chromium.googlesource.com/external/googletest
+	TIMEOUT 10
+	PREFIX "${GTEST_PREFIX}"
+	CMAKE_ARGS "${GTEST_CMAKE_ARGS}"
+	LOG_DOWNLOAD ON
+	LOG_CONFIGURE ON
+	LOG_BUILD ON
+	# Disable install
+	INSTALL_COMMAND ""
+)
+
+set(LIB_PREFIX "${CMAKE_STATIC_LIBRARY_PREFIX}")
+set(LIB_SUFFIX "${CMAKE_STATIC_LIBRARY_SUFFIX}")
+set(GTEST_LOCATION "${GTEST_PREFIX}/src/gtest-build")
+set(GTEST_DEBUG_LIBRARIES
+	"${GTEST_LOCATION}/${DEBUG_LIB_DIR}/${LIB_PREFIX}gtest${LIB_SUFFIX}"
+	"${CMAKE_THREAD_LIBS_INIT}")
+SET(GTEST_RELEASE_LIBRARIES
+	"${GTEST_LOCATION}/${RELEASE_LIB_DIR}/${LIB_PREFIX}gtest${LIB_SUFFIX}"
+	"${CMAKE_THREAD_LIBS_INIT}")
+
+if(MSVC_VERSION EQUAL 1700)
+  add_definitions(-D_VARIADIC_MAX=10)
+endif()
+
+ExternalProject_Get_Property(gtest source_dir)
+include_directories(${source_dir}/include)
+include_directories(${source_dir}/gtest/include)
+
+ExternalProject_Get_Property(gtest binary_dir)
+link_directories(${binary_dir})

code/AssbinExporter.cpp

@@ -51,6 +51,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #	include "../contrib/zlib/zlib.h"
 #endif
 
+#include <time.h>
+
+
 #ifndef ASSIMP_BUILD_NO_EXPORT
 #ifndef ASSIMP_BUILD_NO_ASSBIN_EXPORTER
 

code/AssxmlExporter.cpp

@@ -51,6 +51,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #	include "../contrib/zlib/zlib.h"
 #endif
 
+#include <time.h>
+
 #ifndef ASSIMP_BUILD_NO_EXPORT
 #ifndef ASSIMP_BUILD_NO_ASSXML_EXPORTER
 

code/JoinVerticesProcess.h

@@ -49,8 +49,6 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 namespace Assimp
 {
 
-class JoinVerticesTest;
-
 // ---------------------------------------------------------------------------
 /** The JoinVerticesProcess unites identical vertices in all imported meshes. 
  * By default the importer returns meshes where each face addressed its own 

code/ScenePreprocessor.cpp

@@ -91,11 +91,10 @@ void ScenePreprocessor::ProcessMesh (aiMesh* mesh)
 {
 	// If aiMesh::mNumUVComponents is *not* set assign the default value of 2
 	for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i)	{
-		if (!mesh->mTextureCoords[i])
+		if (!mesh->mTextureCoords[i]) {
 			mesh->mNumUVComponents[i] = 0;
-
-		else {
-			if( !mesh->mNumUVComponents[i])
+		} else {
+			if (!mesh->mNumUVComponents[i])
 				mesh->mNumUVComponents[i] = 2;
 
 			aiVector3D* p = mesh->mTextureCoords[i], *end = p+mesh->mNumVertices;
@@ -112,7 +111,6 @@ void ScenePreprocessor::ProcessMesh (aiMesh* mesh)
 					p->z = p->y = 0.f;
 			}
 			else if (3 == mesh->mNumUVComponents[i]) {
-
 				// Really 3D coordinates? Check whether the third coordinate is != 0 for at least one element
 				for (; p != end; ++p) {
 					if (p->z != 0)