diff --git a/test/test_diff_parser.py b/test/test_diff_parser.py
index fa4eaf2..0a18c9f 100644
--- a/test/test_diff_parser.py
+++ b/test/test_diff_parser.py
@@ -208,6 +208,7 @@ def test_open_parentheses_at_end(differ):
     differ.initialize(code)
     differ.parse(code, parsers=1, expect_error_leaves=True)
 
+
 def test_backslash(differ):
     src = dedent(r"""
     a = 1\
@@ -452,6 +453,9 @@ def test_in_parentheses_newlines(differ):
 
     b = 2""")
 
+    differ.initialize(code1)
+    differ.parse(code2, parsers=1, copies=1)
+
 
 def test_indentation_issue(differ):
     code1 = dedent("""