Allow tolerance when testing expected archive size

Small variation in the archive size could result from compression algorithm changes. With the previous exact comparison
against the size data in the golden master index, this would cause a spurious test failure. The solution is to allow some
tolerance in the sizes during the comparison. This still provides a useful "smoke test" while avoiding the test requiring
undue maintenance effort.

Author: per1234

test/test_all.py

@@ -29,11 +29,13 @@
 import pathlib
 import platform
 import typing
+import math
 
 import invoke.context
 import pytest
 
 test_data_path = pathlib.Path(__file__).resolve().parent.joinpath("testdata")
+size_comparison_tolerance = 0.03  # Maximum allowed archive size difference ratio
 
 
 def test_all(run_command, working_dir):
@@ -174,7 +176,26 @@ def check_index(configuration):
     # Order of releases in the index is arbitrary so a simply equality assertion is not possible
     assert len(library_index["libraries"]) == len(golden_library_index["libraries"])
     for release in library_index["libraries"]:
-        assert release in golden_library_index["libraries"]
+        # Find the golden master for the release
+        golden_release = None
+        for golden_release_candidate in golden_library_index["libraries"]:
+            if (
+                golden_release_candidate["name"] == release["name"]
+                and golden_release_candidate["version"] == release["version"]
+            ):
+                golden_release = golden_release_candidate
+                break
+
+        assert golden_release is not None  # Matching golden release was found
+
+        # Small variation in size could result from compression algorithm changes, so we allow a tolerance
+        assert "size" in release
+        assert math.isclose(release["size"], golden_release["size"], rel_tol=size_comparison_tolerance)
+        # Remove size data so a direct comparison of the remaining data can be made against the golden master
+        del release["size"]
+        del golden_release["size"]
+
+        assert release == golden_release
 
 
 # The engine's Git code struggles to get a clean checkout of releases under some circumstances.