test: fix unittest2pytest brokenness

unittest2pytest created syntax errors, reported here:
pytest-dev/unittest2pytest#51

This commit fixes them back.

tests/test_backward.py

@@ -5,14 +5,17 @@
 
 from coverage.backunittest import TestCase
 from coverage.backward import iitems, binary_bytes, bytes_to_ints
-"""Tests of things from backward.py."""
-deftest_iitems(self):
-    d = {'a': 1, 'b': 2, 'c': 3}
-    items = [('a', 1), ('b', 2), ('c', 3)]
-    self.assertCountEqual(list(iitems(d)), items)
+
+class BackwardTest(TestCase):
+    """Tests of things from backward.py."""
+
+    def test_iitems(self):
+        d = {'a': 1, 'b': 2, 'c': 3}
+        items = [('a', 1), ('b', 2), ('c', 3)]
+        self.assertCountEqual(list(iitems(d)), items)
 
     def test_binary_bytes(self):
-    byte_values = [0, 255, 17, 23, 42, 57]
-    bb = binary_bytes(byte_values)
-    assert len(bb) == len(byte_values)
-    assert byte_values == list(bytes_to_ints(bb))
+        byte_values = [0, 255, 17, 23, 42, 57]
+        bb = binary_bytes(byte_values)
+        assert len(bb) == len(byte_values)
+        assert byte_values == list(bytes_to_ints(bb))

tests/test_testing.py

@@ -30,14 +30,15 @@ def test_xdist_sys_path_nuttiness_is_fixed():
     assert os.environ.get('PYTHONPATH') is None
 
 
-"""Tests of helper methods on `backunittest.TestCase`."""
-deftest_assert_count_equal(self):
-    self.assertCountEqual(set(), set())
-    self.assertCountEqual({1,2,3}, {3,1,2})
-    with pytest.raises(AssertionError):
-        self.assertCountEqual({1,2,3}, set())
-        withpytest.raises(AssertionError):
-        self.assertCountEqual({1,2,3}, {4,5,6})
+class TestingTest(TestCase):
+    """Tests of helper methods on `backunittest.TestCase`."""
+
+    def test_assert_count_equal(self):
+        self.assertCountEqual(set(), set())
+        with pytest.raises(AssertionError):
+            self.assertCountEqual({1,2,3}, set())
+        with pytest.raises(AssertionError):
+            self.assertCountEqual({1,2,3}, {4,5,6})
 
 
 class CoverageTestTest(CoverageTest):