Make unit test more useful in case importer breaks again

test/unit/ImportExport/IRR/utIrrImportExport.cpp

@@ -51,7 +51,8 @@ public:
     virtual bool importerTest() {
         Assimp::Importer importer;
         const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/IRR/box.irr", aiProcess_ValidateDataStructure);
-        return nullptr != scene;
+        // Only one box thus only one mesh
+        return nullptr != scene && scene->mNumMeshes == 1;
     }
 };
 
@@ -63,4 +64,7 @@ TEST_F(utIrrImportExport, importSGIrrTest) {
     Assimp::Importer importer;
     const aiScene *scene = importer.ReadFile(ASSIMP_TEST_MODELS_DIR "/IRR/dawfInCellar_SameHierarchy.irr", aiProcess_ValidateDataStructure);
     EXPECT_NE(nullptr, scene);
+    EXPECT_EQ(scene->mNumMeshes, 2);
+    EXPECT_EQ(scene->mNumMaterials, 2);
+    EXPECT_GT(scene->mMeshes[0]->mNumVertices, 0);
 }