Test newline_style

tests/test_conversions.py

@@ -1,4 +1,4 @@
-from markdownify import markdownify as md, ATX, ATX_CLOSED
+from markdownify import markdownify as md, ATX, ATX_CLOSED, BACKSLASH
 import re
 
 
@@ -86,6 +86,7 @@ def test_nested_blockquote():
 
 def test_br():
     assert md('a<br />b<br />c') == 'a  \nb  \nc'
+    assert md('a<br />b<br />c', newline_style=BACKSLASH) == 'a\\\nb\\\nc'
 
 
 def test_em():