refactor: remove more unneeded backward.py shims

Gone are:

- iitems
- litems
- iternext
- to_bytes
- to_string
- binary_bytes
- byte_to_int
- bytes_to_ints
- BUILTINS

3 files changed, 2 insertions, 28 deletions

diff --git a/tests/test_backward.py b/tests/test_backward.py
deleted file mode 100644
index b40a174b..00000000
--- a/tests/test_backward.py
+++ /dev/null
@@ -1,24 +0,0 @@
-# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
-# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
-
-"""Tests that our version shims in backward.py are working."""
-
-from coverage.backward import iitems, binary_bytes, bytes_to_ints
-
-from tests.coveragetest import CoverageTest
-from tests.helpers import assert_count_equal
-
-
-class BackwardTest(CoverageTest):
-    """Tests of things from backward.py."""
-
-    def test_iitems(self):
-        d = {'a': 1, 'b': 2, 'c': 3}
-        items = [('a', 1), ('b', 2), ('c', 3)]
-        assert_count_equal(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))
diff --git a/tests/test_execfile.py b/tests/test_execfile.py
index 3cdd1ed9..ec8cd180 100644
--- a/tests/test_execfile.py
+++ b/tests/test_execfile.py
@@ -14,7 +14,6 @@ import sys
 import pytest
 
 from coverage import env
-from coverage.backward import binary_bytes
 from coverage.execfile import run_python_file, run_python_module
 from coverage.files import python_reported_file
 from coverage.misc import NoCode, NoSource
@@ -151,7 +150,7 @@ class RunPycFileTest(CoverageTest):
         # Jam Python 2.1 magic number into the .pyc file.
         with open(pycfile, "r+b") as fpyc:
             fpyc.seek(0)
-            fpyc.write(binary_bytes([0x2a, 0xeb, 0x0d, 0x0a]))
+            fpyc.write(bytes([0x2a, 0xeb, 0x0d, 0x0a]))
 
         with pytest.raises(NoCode, match="Bad magic number in .pyc file"):
             run_python_file([pycfile])
diff --git a/tests/test_numbits.py b/tests/test_numbits.py
index 946f8fcb..98399086 100644
--- a/tests/test_numbits.py
+++ b/tests/test_numbits.py
@@ -10,7 +10,6 @@ from hypothesis import example, given, settings
 from hypothesis.strategies import sets, integers
 
 from coverage import env
-from coverage.backward import byte_to_int
 from coverage.numbits import (
     nums_to_numbits, numbits_to_nums, numbits_union, numbits_intersection,
     numbits_any_intersection, num_in_numbits, register_sqlite_functions,
@@ -33,7 +32,7 @@ if env.METACOV:
 def good_numbits(numbits):
     """Assert that numbits is good."""
     # It shouldn't end with a zero byte, that should have been trimmed off.
-    assert (not numbits) or (byte_to_int(numbits[-1]) != 0)
+    assert (not numbits) or (numbits[-1] != 0)
 
 
 class NumbitsOpTest(CoverageTest):