diff --git a/test/fuzz_diff_parser.py b/test/fuzz_diff_parser.py
index 2d962cf..738ca06 100644
--- a/test/fuzz_diff_parser.py
+++ b/test/fuzz_diff_parser.py
@@ -181,7 +181,7 @@ class FileTests:
             code = f.read()
         self._code_lines = split_lines(code, keepends=True)
         self._test_count = test_count
-        self._code_lines = self._code_lines[:30]
+        self._code_lines = self._code_lines
         self._change_count = change_count
 
         with open(file_path) as f:
diff --git a/test/test_diff_parser.py b/test/test_diff_parser.py
index a88e42a..004eedf 100644
--- a/test/test_diff_parser.py
+++ b/test/test_diff_parser.py
@@ -931,7 +931,7 @@ def test_many_nested_ifs(differ):
     differ.parse(code1, parsers=1, copies=1)
 
 
-@pytest.mark.skipif(sys.version_info[0] < 3, reason="Async doesn't work in Python 2.")
+@pytest.mark.skipif(sys.version_info < (3, 4), reason="Async doesn't work in Python 2.")
 @pytest.mark.parametrize('prefix', ['', 'async '])
 def test_with_and_funcdef_in_call(differ, prefix):
     code1 = prefix + dedent('''\
@@ -987,6 +987,7 @@ def test_random_unicode_characters(differ):
     differ.parse('   a( # xx\ndef', parsers=2, expect_error_leaves=True)
 
 
+@pytest.mark.skipif(sys.version_info < (2, 7), reason="No set literals in Python 2.6")
 def test_dedent_end_positions(differ):
     code1 = dedent('''\
         if 1: