add testcase for testing fixing slash-squal

Author: Larry Huang

tests/test_fix_classic_division.py

@@ -4,20 +4,24 @@
 
 
 CLASSIC_DIVISION = ("""\
+a /= 3
 1 / 2
 """,
 """\
 from __future__ import division
+a //= 3
 1 // 2
 """)
 
 NEW_DIVISION = ("""\
 from __future__ import division
 1 / 2
+a /= 3
 """,
 """\
 from __future__ import division
 1 / 2
+a /= 3
 """)