MNT: fix commented-out definition of TestFitDataSet

The `test__resampledPDFDataSet` method belongs to TestFitDataSet class.
Also fix docstring typo.

Author: pavoljuhas

src/diffpy/pdfgui/tests/TestFitDataSet.py

@@ -24,8 +24,8 @@
 from diffpy.pdfgui.control.fitdataset import FitDataSet
 from diffpy.pdfgui.tests.testutils import datafile
 
+# ----------------------------------------------------------------------------
 
-##############################################################################
 class TestRoutines(unittest.TestCase):
 
     def setUp(self):
@@ -71,9 +71,10 @@ def test_grid_interpolation(self):
 
 # End of class TestRoutines
 
-##############################################################################
-#class TestFitDataSet(unittest.TestCase):
-#
+# ----------------------------------------------------------------------------
+
+class TestFitDataSet(unittest.TestCase):
+
 #   def setUp(self):
 #       return
 #
@@ -375,6 +376,8 @@ def test__resampledPDFDataSet(self):
 
 # End of class TestFitDataSet
 
+# ----------------------------------------------------------------------------
+
 if __name__ == '__main__':
     unittest.main()
 

src/diffpy/pdfgui/tests/testutils.py

@@ -168,7 +168,7 @@ def _mockUpMainFrame():
 # Helper for GUITestCase -----------------------------------------------------
 
 class _TMainFrame(object):
-    "Think mockup of the used MainFrame methods."
+    "Thin mockup of the used MainFrame methods."
 
     altered = False