Extend tests for newer_pairwise and fix failed expectation when no fi…

…les are newer.
pypa · Nov 5, 2023 · ce9efc4 · ce9efc4
1 parent 9494203
commit ce9efc4
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Showing 2 changed files with 9 additions and 1 deletion.
diff --git a/distutils/_modified.py b/distutils/_modified.py
@@ -38,7 +38,7 @@ def newer_pairwise(sources, targets):
     of 'newer()'.
     """
     newer_pairs = filter(splat(newer), zip_strict(sources, targets))
-    return tuple(map(list, zip(*newer_pairs)))
+    return tuple(map(list, zip(*newer_pairs))) or ([], [])
 
 
 def newer_group(sources, target, missing='error'):

diff --git a/distutils/tests/test_modified.py b/distutils/tests/test_modified.py
@@ -56,6 +56,14 @@ def test_newer_pairwise_mismatch(self):
         with pytest.raises(ValueError):
             newer_pairwise([one, two], [three])
 
+    def test_newer_pairwise_empty(self):
+        assert newer_pairwise([], []) == ([], [])
+
+    def test_newer_pairwise_fresh(self):
+        one, two, three, four = self._setup_1234()
+
+        assert newer_pairwise([one, three], [two, four]) == ([], [])
+
     def test_newer_group(self):
         tmpdir = self.mkdtemp()
         sources = os.path.join(tmpdir, 'sources')