diff --git a/gklearn/tests/tests_graphkernels.py b/gklearn/tests/tests_graphkernels.py
deleted file mode 100644
index 7154972..0000000
--- a/gklearn/tests/tests_graphkernels.py
+++ /dev/null
@@ -1,32 +0,0 @@
-"""Tests of graph kernels.
-"""
-
-#import pytest
-from gklearn.utils.graphfiles import loadDataset
-
-
-def test_spkernel():
-    """Test shortest path kernel.
-    """
-    from gklearn.kernels.spKernel import spkernel
-    from gklearn.utils.kernels import deltakernel, gaussiankernel, kernelproduct
-    import functools
-    import multiprocessing
-
-    ds_file = '../../datasets/Alkane/dataset.ds'
-    ds_y = '../../datasets/Alkane/dataset_boiling_point_names.txt'
-    Gn, y = loadDataset(ds_file, filename_y=ds_y)
-    Gn = Gn[0:10]
-    y = y[0:10]
-    
-    mixkernel = functools.partial(kernelproduct, deltakernel, gaussiankernel)
-    try:
-        Kmatrix, run_time, idx = spkernel(Gn, node_label=None, node_kernels=
-            {'symb': deltakernel, 'nsymb': gaussiankernel, 'mix': mixkernel},
-            n_jobs=multiprocessing.cpu_count(), verbose=True)
-    except Exception as exception:
-        assert False, exception
-    
-
-if __name__ == "__main__":
-    test_spkernel()
\ No newline at end of file
diff --git a/gklearn/tests/tests_tools.py b/gklearn/tests/tests_tools.py
deleted file mode 100644
index 18778d4..0000000
--- a/gklearn/tests/tests_tools.py
+++ /dev/null
@@ -1 +0,0 @@
-print('Hello graphkit-learn!')