def test_readAndWriteBinaryFileHeader(self):
"""
Reading and writing should not change the binary file header.
"""
for file, attribs in self.files.items():
endian = attribs['endian']
file = os.path.join(self.path, file)
# Read the file.
with open(file, 'rb') as f:
f.seek(3200)
org_header = f.read(400)
header = SEGYBinaryFileHeader(header=org_header, endian=endian)
# The header writes to a file like object.
new_header = io.BytesIO()
header.write(new_header)
new_header.seek(0, 0)
new_header = new_header.read()
# Assert the correct length.
self.assertEqual(len(new_header), 400)
# Assert the actual header.
self.assertEqual(org_header, new_header)
