Fix #1415 : float-color.ply is broken

float-color.ply was broken because it doesn't have a newline at the end.
I'm not sure if a file without newline should be considered valid ?

Added more checks to float-color unit-test in order to fail as excepted.
Fixed the shipped unit test.
Add postprocess validation to PLY unit tests

test/models/PLY/float-color.ply

@@ -15,4 +15,4 @@ end_header
 0.0 0.0 0.0 0 0 1 1
 100.0 0.0 0.0 0 0 1 1
 200.0 200.0 0.0 0 0 1 1
-3 0 1 2
+3 0 1 2

test/unit/utPLYImportExport.cpp

@@ -45,6 +45,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <assimp/Exporter.hpp>
 #include <assimp/scene.h>
 #include "AbstractImportExportBase.h"
+#include <assimp/postprocess.h>
 
 using namespace ::Assimp;
 
@@ -52,7 +53,7 @@ class utPLYImportExport : public AbstractImportExportBase {
 public:
     virtual bool importerTest() {
         Assimp::Importer importer;
-        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", 0 );
+        const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", aiProcess_ValidateDataStructure);
         EXPECT_EQ( 1u, scene->mNumMeshes );
         EXPECT_NE( nullptr, scene->mMeshes[0] );
         EXPECT_EQ( 8u, scene->mMeshes[0]->mNumVertices );
@@ -65,7 +66,7 @@ public:
     virtual bool exporterTest() {
         Importer importer;
         Exporter exporter;
-        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", 0);
+        const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", aiProcess_ValidateDataStructure);
         EXPECT_NE(nullptr, scene);
         EXPECT_EQ(aiReturn_SUCCESS, exporter.Export(scene, "ply", ASSIMP_TEST_MODELS_DIR "/PLY/cube_test.ply"));
 
@@ -89,19 +90,28 @@ TEST_F(utPLYImportExport, exportTest_Success ) {
 //Test issue 1623, crash when loading two PLY files in a row
 TEST_F(utPLYImportExport, importerMultipleTest) {
     Assimp::Importer importer;
-    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", 0);
+    const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", aiProcess_ValidateDataStructure);
 
     EXPECT_NE(nullptr, scene);
 
-    scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", 0);
+    scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/PLY/cube.ply", aiProcess_ValidateDataStructure);
 
     EXPECT_NE(nullptr, scene);
 }
 
 TEST_F( utPLYImportExport, vertexColorTest ) {
     Assimp::Importer importer;
-    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/PLY/float-color.ply", 0 );
+    const aiScene *scene = importer.ReadFile( ASSIMP_TEST_MODELS_DIR "/PLY/float-color.ply", aiProcess_ValidateDataStructure);
     EXPECT_NE( nullptr, scene );
+    EXPECT_EQ(1u, scene->mMeshes[0]->mNumFaces);
+    EXPECT_EQ(aiPrimitiveType_TRIANGLE, scene->mMeshes[0]->mPrimitiveTypes);
+    EXPECT_EQ(true, scene->mMeshes[0]->HasVertexColors(0));
+
+    auto first_face = scene->mMeshes[0]->mFaces[0];
+    EXPECT_EQ(3, first_face.mNumIndices);
+    EXPECT_EQ(0, first_face.mIndices[0]);
+    EXPECT_EQ(1, first_face.mIndices[1]);
+    EXPECT_EQ(2, first_face.mIndices[2]);
 }
 
 static const char *test_file =
@@ -125,6 +135,6 @@ static const char *test_file =
 
 TEST_F( utPLYImportExport, parseErrorTest ) {
     Assimp::Importer importer;
-    const aiScene *scene = importer.ReadFileFromMemory( test_file, strlen( test_file ), 0 );
+    const aiScene *scene = importer.ReadFileFromMemory( test_file, strlen( test_file ), aiProcess_ValidateDataStructure);
     EXPECT_NE( nullptr, scene );
 }