Tests and a changenote for corrupted metadata fix

Author: MrMino

CHANGELOG.md

@@ -17,6 +17,12 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 - Unconstrained `packaging` requirement. At the time of writing this, all
   versions up to `packaging==24.1` pass the tests on Linux.
 
+### Fixed
+- Lazy mode will no longer confuse corrupted wheeldata with metadata - if
+  `WHEEL` file is corrupted or wrong, the `.wheeldata` will be set to `None`,
+  as opposed to `.metadata` as was the case previously. Thanks to
+  [mboisson](https://github.com/mboisson) for spotting this and the fix.
+
 ## [0.0.8] - 2021-08-03
 ### Changed
 - Since `WheelFile` write methods now have `skipdir=True` default (see below),

tests/test_corrupted_metadata.py

@@ -0,0 +1,37 @@
+from wheelfile import WheelFile
+
+
+def test_when_metadata_is_corrupted_sets_metadata_to_none(buf):
+    wf = WheelFile(buf, distname="_", version="0", mode="w")
+    wf.metadata = "This is not a valid metadata"  # type: ignore
+    wf.close()
+
+    with WheelFile(buf, distname="_", version="0", mode="rl") as broken_wf:
+        assert broken_wf.metadata is None
+
+
+def test_when_wheeldata_is_corrupted_sets_wheeldata_to_none(buf):
+    wf = WheelFile(buf, distname="_", version="0", mode="w")
+    wf.wheeldata = "This is not a valid wheeldata"  # type: ignore
+    wf.close()
+
+    with WheelFile(buf, distname="_", version="0", mode="rl") as broken_wf:
+        assert broken_wf.wheeldata is None
+
+
+def test_wheeldata_is_read_even_if_metadata_corrupted(buf):
+    wf = WheelFile(buf, distname="_", version="0", mode="w")
+    wf.metadata = "This is not a valid metadata"  # type: ignore
+    wf.close()
+
+    with WheelFile(buf, distname="_", version="0", mode="rl") as broken_wf:
+        assert broken_wf.wheeldata is not None
+
+
+def test_metadata_is_read_even_if_wheeldata_corrupted(buf):
+    wf = WheelFile(buf, distname="_", version="0", mode="w")
+    wf.wheeldata = "This is not a valid wheeldata"  # type: ignore
+    wf.close()
+
+    with WheelFile(buf, distname="_", version="0", mode="rl") as broken_wf:
+        assert broken_wf.metadata is not None