New test suite for file objects by Jeremy Hilton. This will need

to be extended somewhat -- right now it only tests the .writelines()
method.

Lib/test/test_file.py

+from test_support import TESTFN
+from UserList import UserList
+
+# verify writelines with instance sequence
+l = UserList(['1', '2'])
+f = open(TESTFN, 'wb')
+f.writelines(l)
+f.close()
+f = open(TESTFN, 'rb')
+buf = f.read()
+f.close()
+assert buf == '12'
+
+# verify writelines with integers
+f = open(TESTFN, 'wb')
+try:
+    f.writelines([1, 2, 3])
+except TypeError:
+    pass
+else:
+    print "writelines accepted sequence of integers"
+f.close()
+
+# verify writelines with integers in UserList
+f = open(TESTFN, 'wb')
+l = UserList([1,2,3])
+try:
+    f.writelines(l)
+except TypeError:
+    pass
+else:
+    print "writelines accepted sequence of integers"
+f.close()
+
+# verify writelines with non-string object
+class NonString: pass
+
+f = open(TESTFN, 'wb')
+try:
+    f.writelines([NonString(), NonString()])
+except TypeError:
+    pass
+else:
+    print "writelines accepted sequence of non-string objects"
+f.close()