test for all the different line ending characters

Tests/test_file_eps.py

@@ -148,6 +148,71 @@ class TestFileEps(PillowTestCase):
         # open image with binary preview
         Image.open(file3)
 
+    def _test_readline(self,t, ending):
+        ending = "Failure with line ending: %s" %("".join("%s" %ord(s) for s in ending))
+        self.assertEqual(t.readline().strip('\r\n'), 'something', ending)
+        self.assertEqual(t.readline().strip('\r\n'), 'else', ending)
+        self.assertEqual(t.readline().strip('\r\n'), 'baz', ending)
+        self.assertEqual(t.readline().strip('\r\n'), 'bif', ending)
+
+    def _test_readline_stringio(self, test_string, ending):
+        # check all the freaking line endings possible
+        try:
+            import StringIO
+        except:
+            # don't skip, it skips everything in the parent test
+            return
+        t = StringIO.StringIO(test_string)
+        self._test_readline(t, ending)
+        
+    def _test_readline_io(self, test_string, ending):
+        import io
+        t = io.StringIO(test_string)
+        self._test_readline(t, ending)
+
+    def _test_readline_file_universal(self, test_string, ending):
+        f = self.tempfile('temp.txt')
+        with open(f,'wb') as w:
+            if str is bytes:
+                w.write(test_string)
+            else:
+                w.write(test_string.encode('UTF-8'))
+
+        with open(f,'rU') as t:
+            self._test_readline(t, ending)
+
+    def _test_readline_file_psfile(self, test_string, ending):
+        f = self.tempfile('temp.txt')
+        with open(f,'wb') as w:
+            if str is bytes:
+                w.write(test_string)
+            else:
+                w.write(test_string.encode('UTF-8'))
+
+        with open(f,'rb') as r:
+            t = EpsImagePlugin.PSFile(r)
+            self._test_readline(t, ending)
+                                    
+    def test_readline(self):
+        # check all the freaking line endings possible from the spec
+        #test_string = u'something\r\nelse\n\rbaz\rbif\n'
+        line_endings = [u'\r\n', u'\n']
+        not_working_endings = [u'\n\r', u'\r'] 
+        strings = [u'something', u'else', u'baz', u'bif']
+
+        for ending in line_endings:
+            s = ending.join(strings)
+            self._test_readline_stringio(s, ending)
+            self._test_readline_io(s, ending)
+            self._test_readline_file_universal(s, ending)
+
+        for ending in not_working_endings:
+            # these only work with the PSFile, while they're in spec,
+            # they're not likely to be used
+            s = ending.join(strings)             
+            self._test_readline_file_psfile(s, ending)
+      
+
 if __name__ == '__main__':
     unittest.main()