Implemented test.

tests/test_reader.py

@@ -16,18 +16,27 @@ class TestReader(unittest.TestCase):
     def test_extension(self):
         self.assertTrue('nd2' in ND2Reader.class_exts())
 
+    def cmp_two_readers(self, r1, r2):
+        attributes = r1.data['image_attributes']['SLxImageAttributes']
+        self.assertEqual(r2.metadata['width'], attributes['uiWidth'])
+        self.assertEqual(r2.metadata['height'], attributes['uiHeight'])
+
+        self.assertEqual(r2.metadata['width'], r2.sizes['x'])
+        self.assertEqual(r2.metadata['height'], r2.sizes['y'])
+
+        self.assertEqual(r2.pixel_type, np.float64)
+        self.assertEqual(r2.iter_axes, ['t'])
+
     def test_init_and_init_axes(self):
         with ArtificialND2('test_data/test_nd2_reader.nd2') as artificial:
             with ND2Reader('test_data/test_nd2_reader.nd2') as reader:
-                attributes = artificial.data['image_attributes']['SLxImageAttributes']
-                self.assertEqual(reader.metadata['width'], attributes['uiWidth'])
-                self.assertEqual(reader.metadata['height'], attributes['uiHeight'])
+                self.cmp_two_readers(artificial, reader)
 
-                self.assertEqual(reader.metadata['width'], reader.sizes['x'])
-                self.assertEqual(reader.metadata['height'], reader.sizes['y'])
-
-                self.assertEqual(reader.pixel_type, np.float64)
-                self.assertEqual(reader.iter_axes, ['t'])
+    def test_init_from_handler(self):
+        with ArtificialND2('test_data/test_nd2_reader.nd2') as artificial:
+            with open('test_data/test_nd2_reader.nd2', "rb") as FH:
+                with ND2Reader(FH) as reader:
+                    self.cmp_two_readers(artificial, reader)
 
     def test_init_empty_file(self):
         with ArtificialND2('test_data/empty.nd2', skip_blocks=['label_map_marker']):