yapftests: Remove unused imports

yapftests/main_test.py

@@ -15,7 +15,6 @@
 """Tests for yapf.__init__.main."""
 
 import sys
-import unittest
 from contextlib import contextmanager
 from io import StringIO
 

yapftests/reformatter_basic_test.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 """Basic tests for yapf.reformatter."""
 
-import sys
 import textwrap
 import unittest
 

yapftests/reformatter_python3_test.py

@@ -13,7 +13,6 @@
 # limitations under the License.
 """Python 3 tests for yapf.reformatter."""
 
-import sys
 import textwrap
 import unittest
 

yapftests/subtype_assigner_test.py

@@ -17,7 +17,6 @@
 import unittest
 
 from yapf.pytree import pytree_utils
-from yapf.yapflib import format_token
 from yapf.yapflib import subtypes
 
 from yapftests import yapf_test_helper

yapftests/yapf_test.py

@@ -15,17 +15,12 @@
 """Tests for yapf.yapf."""
 
 import io
-import logging
-import os
 import shutil
 import subprocess
 import sys
 import tempfile
 import textwrap
 import unittest
-from io import StringIO
-
-from yapf_third_party._ylib2to3.pgen2 import tokenize
 
 from yapf.yapflib import errors
 from yapf.yapflib import style