Add utils tests for splitlines and source_to_unicode.

test/test_utils.py

@@ -0,0 +1,27 @@
+from parso.utils import splitlines, source_to_unicode
+
+
+def test_splitlines_no_keepends():
+    assert splitlines('asd\r\n') == ['asd', '']
+    assert splitlines('asd\r\n\f') == ['asd', '\f']
+    assert splitlines('\fasd\r\n') == ['\fasd', '']
+    assert splitlines('') == ['']
+    assert splitlines('\n') == ['', '']
+
+
+def test_splitlines_keepends():
+    assert splitlines('asd\r\n', keepends=True) == ['asd\r\n', '']
+    assert splitlines('asd\r\n\f', keepends=True) == ['asd\r\n', '\f']
+    assert splitlines('\fasd\r\n', keepends=True) == ['\fasd\r\n', '']
+    assert splitlines('', keepends=True) == ['']
+    assert splitlines('\n', keepends=True) == ['\n', '']
+
+
+def test_source_to_unicode_unicode_text(self):
+    source = (
+        b"# vim: fileencoding=utf-8\n"
+        b"# \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a\n"
+    )
+    actual = source_to_unicode(source)
+    expected = source.decode('utf-8')
+    assert actual == expected