adds tests for new bytestream handling

skimage/external/test_tifffile.py

@@ -42,6 +42,8 @@ def test_extension():
 class TestSave:
 
     def roundtrip(self, dtype, x):
+
+        # input: file name
         f = NamedTemporaryFile(suffix='.tif')
         fname = f.name
         f.close()
@@ -49,6 +51,22 @@ class TestSave:
         y = imread(fname)
         assert_array_equal(x, y)
 
+        # input: open file object
+        f = NamedTemporaryFile(suffix='.tif')
+        imsave(f, x)
+        f.seek(0)
+        y = imread(f)
+        assert_array_equal(x, y)
+        f.close()
+
+        #input: byte stream
+        from io import BytesIO
+        b = BytesIO()
+        imsave(b, x)
+        b.seek(0)
+        y = imread(b)
+        assert_array_equal(x, y)
+
     def test_imsave_roundtrip(self):
         for shape in [(10, 10), (10, 10, 3), (10, 10, 4)]:
             for dtype in (np.uint8, np.uint16, np.float32, np.int16,

skimage/external/tifffile/tifffile.py

@@ -1264,6 +1264,7 @@ class TiffFile(object):
 
     def close(self):
         """Close open file handle(s)."""
+
         for tif in self._files.values():
             tif._fh.close()
         self._files = {}