Unit tests for the exposition of image buffers.

2 files changed, 92 insertions, 0 deletions

diff --git a/test/TestsRunner.py b/test/TestsRunner.py
index d10b5e6..f2b3b49 100755
--- a/test/TestsRunner.py
+++ b/test/TestsRunner.py
@@ -41,6 +41,7 @@ from exif import TestExifTag
 from iptc import TestIptcTag
 from xmp import TestXmpTag
 from metadata import TestImageMetadata
+from buffer import TestBuffer
 
 
 if __name__ == '__main__':
@@ -59,5 +60,6 @@ if __name__ == '__main__':
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestIptcTag))
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestXmpTag))
     suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestImageMetadata))
+    suite.addTest(unittest.defaultTestLoader.loadTestsFromTestCase(TestBuffer))
     # Run the test suite
     unittest.TextTestRunner(verbosity=2).run(suite)
diff --git a/test/buffer.py b/test/buffer.py
new file mode 100644
index 0000000..5379712
--- /dev/null
+++ b/test/buffer.py
@@ -0,0 +1,90 @@
+# -*- coding: utf-8 -*-
+
+# ******************************************************************************
+#
+# Copyright (C) 2010 Olivier Tilloy <olivier@tilloy.net>
+#
+# This file is part of the pyexiv2 distribution.
+#
+# pyexiv2 is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# pyexiv2 is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pyexiv2; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
+#
+# Author: Olivier Tilloy <olivier@tilloy.net>
+#
+# ******************************************************************************
+
+import unittest
+import os.path
+import hashlib
+from datetime import datetime
+
+from pyexiv2.metadata import ImageMetadata
+
+import testutils
+
+
+class TestBuffer(unittest.TestCase):
+
+    def setUp(self):
+        self.filename = os.path.join('data', 'smiley1.jpg')
+        self.md5sum = 'c066958457c685853293058f9bf129c1'
+        self.assert_(testutils.CheckFileSum(self.filename, self.md5sum))
+
+    def _metadata_from_buffer(self):
+        fd = open(self.filename, 'rb')
+        data = fd.read()
+        fd.close()
+        return ImageMetadata.from_buffer(data)
+
+    def test_from_file_and_from_buffer(self):
+        # from file
+        m1 = ImageMetadata(self.filename)
+        m1.read()
+        self.assertEqual(hashlib.md5(m1.buffer).hexdigest(), self.md5sum)
+
+        # from buffer
+        m2 = self._metadata_from_buffer()
+        self.assertEqual(hashlib.md5(m2.buffer).hexdigest(), self.md5sum)
+
+    def test_buffer_not_updated_until_write_called(self):
+        m = self._metadata_from_buffer()
+        m.read()
+        self.assertEqual(hashlib.md5(m.buffer).hexdigest(), self.md5sum)
+
+        # Modify the value of an EXIF tag
+        m['Exif.Image.DateTime'].value = datetime.today()
+        # Check that the buffer is unchanged until write() is called
+        self.assertEqual(hashlib.md5(m.buffer).hexdigest(), self.md5sum)
+        # Write back the changes
+        m.write()
+        # Check that the buffer has changed
+        self.failIfEqual(hashlib.md5(m.buffer).hexdigest(), self.md5sum)
+
+    def test_from_original_buffer(self):
+        m1 = self._metadata_from_buffer()
+        m2 = ImageMetadata.from_buffer(m1.buffer)
+        self.assertEqual(hashlib.md5(m2.buffer).hexdigest(), self.md5sum)
+
+    def test_from_modified_buffer(self):
+        m1 = self._metadata_from_buffer()
+        m1.read()
+        key = 'Exif.Image.ImageDescription'
+        value = 'my kingdom for a semiquaver'
+        m1[key] = value
+        m1.write()
+
+        m2 = ImageMetadata.from_buffer(m1.buffer)
+        m2.read()
+        self.assertEqual(m2[key].value, value)
+