fixed test units

test_app.py

 import unittest
 
-from app import app
 
 class test_extraction(unittest.TestCase):
 
@@ -18,9 +17,10 @@ class test_extraction(unittest.TestCase):
 
         self.assertEqual(str(type(ds)), "<class 'numpy.ndarray'>")
         self.assertEqual(str(type(ds1)), "<class 'numpy.ndarray'>")
-        self.assertEqual(arr.shape, (1000,1000))
+        self.assertEqual(arr.shape, (1000, 1000))
         self.assertEqual(arr1.shape, (2, 600, 600))
 
+
 class test_plotting(unittest.TestCase):
     def test_plot(self):
         from modules.h5ceric import extract_dataset, plot_dispatcher
@@ -33,6 +33,7 @@ class test_plotting(unittest.TestCase):
         self.assertEqual(str(type(ds)), "<class 'numpy.ndarray'>")
         self.assertEqual(str(type(p)), "<class 'bokeh.plotting.figure.Figure'>")
 
+
 # test missing file case
 class test_Assertions(unittest.TestCase):
     def test_filenoutfound(self):
@@ -45,4 +46,3 @@ class test_Assertions(unittest.TestCase):
 
 if __name__ == '__main__':
     unittest.main()
-