Added extra test and small tweak to docs

src/core_codemods/docs/pixee_python_literal-or-new-object-identity.md

@@ -1,4 +1,4 @@
-The `is` and `is not` operator will only return `True` when the expression have the same `id`, that is, `a is b` is equivalent to `id(a) == id(b)`. New objects and literals have their own identities and thus shouldn't be compared with using the `is` or `is not` operators.
+The `is` and `is not` operator will only return `True` when the expression have the same `id`. In other words, `a is b` is equivalent to `id(a) == id(b)`. New objects and literals have their own identities and thus shouldn't be compared with using the `is` or `is not` operators.
 
 Our changes look something like this:
 

tests/codemods/test_literal_or_new_object_identity.py

@@ -19,6 +19,16 @@ def test_list(self, tmpdir):
         self.run_and_assert(tmpdir, dedent(input_code), dedent(expected))
         assert len(self.file_context.codemod_changes) == 1
 
+    def test_list_lhs(self, tmpdir):
+        input_code = """\
+        [1,2,3] is l
+        """
+        expected = """\
+        [1,2,3] == l
+        """
+        self.run_and_assert(tmpdir, dedent(input_code), dedent(expected))
+        assert len(self.file_context.codemod_changes) == 1
+
     def test_list_function(self, tmpdir):
         input_code = """\
         l is list({1,2,3})