diff --git a/nd2reader/legacy.py b/nd2reader/legacy.py
index 244ee73..333198c 100644
--- a/nd2reader/legacy.py
+++ b/nd2reader/legacy.py
@@ -91,7 +91,7 @@ class Nd2(object):
             int: the pixel height of the image
 
         """
-        return self.reader.metadata["height"]
+        return self.reader.metadata["height"] if self.reader.metadata["height"] is not None else 0
 
     @property
     def width(self):
@@ -101,7 +101,7 @@ class Nd2(object):
             int: the pixel width of the image
 
         """
-        return self.reader.metadata["width"]
+        return self.reader.metadata["width"] if self.reader.metadata["width"] is not None else 0
 
     @property
     def z_levels(self):
diff --git a/tests/test_common.py b/tests/test_common.py
index 8f5ac83..ac71516 100644
--- a/tests/test_common.py
+++ b/tests/test_common.py
@@ -1,9 +1,13 @@
+import io
 import unittest
 from os import path
 import six
+import struct
 
 from nd2reader.artificial import ArtificialND2
-from nd2reader.common import get_version, parse_version, parse_date, _add_to_metadata
+from nd2reader.common import get_version, parse_version, parse_date, _add_to_metadata, _parse_unsigned_char, \
+    _parse_unsigned_int, _parse_unsigned_long, _parse_double, _parse_string
+from nd2reader.exceptions import InvalidVersionError
 
 
 class TestCommon(unittest.TestCase):
@@ -27,6 +31,10 @@ class TestCommon(unittest.TestCase):
         expected = (3, 0)
         self.assertTupleEqual(actual, expected)
 
+    def test_parse_version_invalid(self):
+        data = 'ND2 FILE SIGNATURE CHUNK NAME!Version2.2.3'
+        self.assertRaises(InvalidVersionError, parse_version, data)
+
     def test_get_version_from_file(self):
         self.create_test_nd2()
 
@@ -62,3 +70,24 @@ class TestCommon(unittest.TestCase):
         metadata = {'test': ['value1', 'value2']}
         _add_to_metadata(metadata, 'test', 'value3')
         self.assertDictEqual(metadata, {'test': ['value1', 'value2', 'value3']})
+
+    @staticmethod
+    def _prepare_bin_stream(format, value):
+        file = io.BytesIO()
+        data = struct.pack(format, value)
+        file.write(data)
+        file.seek(0)
+        return file
+
+    def test_parse_functions(self):
+        file = self._prepare_bin_stream("B", 9)
+        self.assertEqual(_parse_unsigned_char(file), 9)
+
+        file = self._prepare_bin_stream("I", 333)
+        self.assertEqual(_parse_unsigned_int(file), 333)
+
+        file = self._prepare_bin_stream("Q", 7564332)
+        self.assertEqual(_parse_unsigned_long(file), 7564332)
+
+        file = self._prepare_bin_stream("d", 47.9)
+        self.assertEqual(_parse_double(file), 47.9)
diff --git a/tests/test_legacy.py b/tests/test_legacy.py
new file mode 100644
index 0000000..c28d5d6
--- /dev/null
+++ b/tests/test_legacy.py
@@ -0,0 +1,25 @@
+import unittest
+from os import path
+
+from nd2reader.artificial import ArtificialND2
+from nd2reader.legacy import Nd2
+
+
+class TestLegacy(unittest.TestCase):
+    def create_test_nd2(self):
+        with ArtificialND2(self.test_file) as artificial:
+            artificial.close()
+
+    def setUp(self):
+        dir_path = path.dirname(path.realpath(__file__))
+        self.test_file = path.join(dir_path, 'test_data/test.nd2')
+
+    def test_can_open_test_file(self):
+        self.create_test_nd2()
+        with Nd2(self.test_file) as reader:
+            self.assertEqual(reader.width, 0)
+            self.assertEqual(reader.height, 0)
+            self.assertEqual(len(reader.z_levels), 1)
+            self.assertEqual(len(reader.channels), 0)
+            self.assertEqual(len(reader.frames), 1)
+