Add waLBerla to conftest

conftest.py

@@ -52,6 +52,13 @@ except ImportError:
                        os.path.join(SCRIPT_FOLDER, "pystencils_tests/benchmark/benchmark.py")]
     add_path_to_ignore('pystencils/kerncraft_coupling')
 
+try:
+    import waLBerla
+except ImportError:
+    collect_ignore += [os.path.join(SCRIPT_FOLDER, "pystencils_tests/test_aligned_array.py"),
+                       os.path.join(SCRIPT_FOLDER, "pystencils_tests/test_datahandling_parallel.py"),
+                       os.path.join(SCRIPT_FOLDER, "pystencils_tests/test_small_block_benchmark.ipynb")]
+
 try:
     import blitzdb
 except ImportError: