BF - delete images after read for windows tests

Windows is more upset by deleting files for which there are objects still
holding references thereto.  Delete these objects while in the temporary
directory to make windows happier.

Author: matthew-brett

nibabel/freesurfer/tests/test_mghformat.py

@@ -12,7 +12,7 @@
 import numpy as np
 from .. import load, save, MGHImage
 from ..mghformat import MGHError
-from ...tmpdirs import TemporaryDirectory
+from ...tmpdirs import InTemporaryDirectory
 from ...testing import data_path
 from numpy.testing import assert_equal, assert_array_equal, \
     assert_array_almost_equal, assert_almost_equal, assert_raises
@@ -52,23 +52,23 @@ def test_write_mgh():
     v = v.reshape((5, 4, 3, 2)).astype(np.float32)
     # form a MGHImage object using data and vox2ras matrix
     img = MGHImage(v, v2r)
-    with TemporaryDirectory() as tmpdir:
-        save(img, os.path.join(tmpdir, 'tmpsave.mgz'))
+    with InTemporaryDirectory():
+        save(img, 'tmpsave.mgz')
         # read from the tmp file and see if it checks out
-        mgz = load(os.path.join(tmpdir, 'tmpsave.mgz'))
-
+        mgz = load('tmpsave.mgz')
+        h = mgz.get_header()
+        dat = mgz.get_data()
+        # Delete loaded image to allow file deletion by windows
+        del mgz
     # header
-    h = mgz.get_header()
     assert_equal(h['version'], 1)
     assert_equal(h['type'], 3)
     assert_equal(h['dof'], 0)
     assert_equal(h['goodRASFlag'], 1)
     assert_array_equal(h['dims'], [5, 4, 3, 2])
     assert_array_almost_equal(h['mrparms'], [0.0, 0.0, 0.0, 0.0])
     assert_array_almost_equal(h.get_vox2ras(), v2r)
-
     # data
-    dat = mgz.get_data()
     assert_almost_equal(dat, v, 7)
 
 
@@ -79,20 +79,20 @@ def test_write_noaffine_mgh():
     # form a MGHImage object using data
     # and the default affine matrix (Note the "None")
     img = MGHImage(v, None)
-    with TemporaryDirectory() as tmpdir:
-        save(img, os.path.join(tmpdir, 'tmpsave.mgz'))
+    with InTemporaryDirectory():
+        save(img, 'tmpsave.mgz')
         # read from the tmp file and see if it checks out
-        mgz = load(os.path.join(tmpdir, 'tmpsave.mgz'))
-
+        mgz = load('tmpsave.mgz')
+        h = mgz.get_header()
+        # Delete loaded image to allow file deletion by windows
+        del mgz
     # header
-    h = mgz.get_header()
     assert_equal(h['version'], 1)
     assert_equal(h['type'], 0)  # uint8 for mgh
     assert_equal(h['dof'], 0)
     assert_equal(h['goodRASFlag'], 1)
     assert_array_equal(h['dims'], [7, 13, 3, 22])
     assert_array_almost_equal(h['mrparms'], [0.0, 0.0, 0.0, 0.0])
-
     # important part -- whether default affine info is stored
     ex_mdc = np.array([[-1, 0, 0],
                        [0, 0, -1],