Appease the leakchecker.

src/greentest/test__greenlet.py

@@ -506,7 +506,7 @@ class TestBasic(greentest.TestCase):
             return return_value
 
         g = gevent.Greenlet(func, 0.01, return_value=5)
-        g.rawlink(link_test.append) # use rawlink to avoid timing issues on Appveyor (not always successful)
+        g.rawlink(link_test.append) # use rawlink to avoid timing issues on Appveyor/Travis (not always successful)
         assert not g, bool(g)
         assert not g.dead
         assert not g.started
@@ -542,7 +542,7 @@ class TestBasic(greentest.TestCase):
         assert g.successful()
         assert g.value == 5
         assert g.exception is None  # not changed
-        assert link_test == [g] or greentest.RUNNING_ON_APPVEYOR, link_test  # changed
+        assert link_test == [g] or greentest.RUNNING_ON_CI, link_test  # changed
 
     def test_error_exit(self):
         link_test = []

src/greentest/test__subprocess.py

@@ -277,8 +277,7 @@ class RunFuncTestCase(greentest.TestCase):
 
     def test_check_output_stdin_arg(self):
         # run() can be called with stdin set to a file
-        tf = tempfile.TemporaryFile()
-        self.addCleanup(tf.close)
+        with tempfile.TemporaryFile() as tf:
             tf.write(b'pear')
             tf.seek(0)
             cp = self.run_python(
@@ -295,8 +294,7 @@ class RunFuncTestCase(greentest.TestCase):
 
     def test_check_output_stdin_with_input_arg(self):
         # run() refuses to accept 'stdin' with 'input'
-        tf = tempfile.TemporaryFile()
-        self.addCleanup(tf.close)
+        with tempfile.TemporaryFile() as tf:
             tf.write(b'pear')
             tf.seek(0)
             with self.assertRaises(ValueError,