TEST: Copy fallback tests optional

Should pass on at least one CI server, but a hard FUSE requirement is
probably too much to demand just to test nipype.

Author: effigies

nipype/utils/tests/test_filemanip.py

@@ -4,6 +4,7 @@
 
 import os
 from tempfile import mkstemp, mkdtemp
+import warnings
 
 from nipype.testing import assert_equal, assert_true, assert_false, TempFATFS
 from nipype.utils.filemanip import (save_json, load_json,
@@ -173,21 +174,29 @@ def test_copyfallback():
     orig_img, orig_hdr = _temp_analyze_files()
     pth, imgname = os.path.split(orig_img)
     pth, hdrname = os.path.split(orig_hdr)
-    with TempFATFS() as fatdir:
-        tgt_img = os.path.join(fatdir, imgname)
-        tgt_hdr = os.path.join(fatdir, hdrname)
-        for copy in (True, False):
-            for use_hardlink in (True, False):
-                copyfile(orig_img, tgt_img, copy=copy,
-                         use_hardlink=use_hardlink)
-                yield assert_true, os.path.exists(tgt_img)
-                yield assert_true, os.path.exists(tgt_hdr)
-                yield assert_false, os.path.islink(tgt_img)
-                yield assert_false, os.path.islink(tgt_hdr)
-                yield assert_false, os.path.samefile(orig_img, tgt_img)
-                yield assert_false, os.path.samefile(orig_hdr, tgt_hdr)
-                os.unlink(tgt_img)
-                os.unlink(tgt_hdr)
+    try:
+        fatfs = TempFATFS()
+    except IOError:
+        warnings.warn('Fuse mount failed. copyfile fallback tests skipped.')
+    else:
+        with fatfs as fatdir:
+            tgt_img = os.path.join(fatdir, imgname)
+            tgt_hdr = os.path.join(fatdir, hdrname)
+            for copy in (True, False):
+                for use_hardlink in (True, False):
+                    copyfile(orig_img, tgt_img, copy=copy,
+                             use_hardlink=use_hardlink)
+                    yield assert_true, os.path.exists(tgt_img)
+                    yield assert_true, os.path.exists(tgt_hdr)
+                    yield assert_false, os.path.islink(tgt_img)
+                    yield assert_false, os.path.islink(tgt_hdr)
+                    yield assert_false, os.path.samefile(orig_img, tgt_img)
+                    yield assert_false, os.path.samefile(orig_hdr, tgt_hdr)
+                    os.unlink(tgt_img)
+                    os.unlink(tgt_hdr)
+    finally:
+        os.unlink(orig_img)
+        os.unlink(orig_hdr)
 
 
 def test_filename_to_list():