lib.Package: Add unit tests

parse_spec_str(), parse_specs_str(), order_tags(), and __repr__ are pure
text processing without test coverage, shared by the dpkg and rpm package
manager backends.

Add unit tests for valid and invalid spec strings, multi-line input with
and without a trailing newline, tag ordering with default values, and the
repr layout.

Signed-off-by: Jan Lindemann <jan@janware.com>
Assisted-by: unsloth/Qwen3.8-27B-GGUF:Q4_K_M with pi.dev v0.85.1

test/unit/python/jw/pkg/lib/Package/Makefile

@@ -0,0 +1,7 @@
+TOPDIR = ../../../../../../..
+
+include $(TOPDIR)/make/proj.mk
+include $(JWBDIR)/make/py-run.mk
+
+all:
+test: run

test/unit/python/jw/pkg/lib/Package/test.py

@@ -0,0 +1,80 @@
+from jw.pkg.lib.Package import Package, meta_tags
+
+# -- parse_spec_str --
+
+p = Package.parse_spec_str(
+    'jw-core|jw|Jan|https://example.com/jw-core|Jan <jan@example.com>'
+)
+assert p.name == 'jw-core'
+assert p.vendor == 'jw'
+assert p.packager == 'Jan'
+assert p.url == 'https://example.com/jw-core'
+assert p.maintainer == 'Jan <jan@example.com>'
+
+# An empty field is preserved as an empty string
+p = Package.parse_spec_str('name||||')
+assert p.name == 'name'
+assert p.vendor == ''
+assert p.packager == ''
+assert p.url == ''
+assert p.maintainer == ''
+
+# A custom delimiter works
+p = Package.parse_spec_str('a,b,c,d,e', delimiter = ',')
+assert p.name == 'a'
+assert p.maintainer == 'e'
+
+# Wrong field counts raise
+for spec in ('a', 'a|b', 'a|b|c|d', 'a|b|c|d|e|f'):
+    try:
+        Package.parse_spec_str(spec)
+        assert False, f'Should have raised for "{spec}"'
+    except ValueError:
+        pass
+
+# -- parse_specs_str --
+
+specs = (
+    'jw-core|jw|Jan|https://example.com/jw-core|Jan\n'
+    'jw-base|jw|Jan|https://example.com/jw-base|Jan'
+)
+packages = Package.parse_specs_str(specs)
+assert [p.name for p in packages] == ['jw-core', 'jw-base']
+# A trailing newline does not create a phantom package
+assert len(packages) == 2
+# A trailing newline is not needed
+packages = Package.parse_specs_str(specs + '\n')
+assert [p.name for p in packages] == ['jw-core', 'jw-base']
+
+# An empty string parses to no packages
+assert Package.parse_specs_str('') == []
+
+# -- order_tags --
+
+mapping = {
+    'maintainer': 'Jan',
+    'name': 'jw-core',
+    'url': 'https://example.com/jw-core',
+}
+ordered = Package.order_tags(mapping)
+assert list(ordered) == meta_tags
+assert ordered == {
+    'name': 'jw-core',
+    'vendor': '',
+    'packager': '',
+    'url': 'https://example.com/jw-core',
+    'maintainer': 'Jan',
+}
+
+# -- __repr__ --
+
+p = Package.parse_spec_str('jw-core|jw|Jan|url|Jan')
+assert repr(p) == (
+    'name           : jw-core\n'
+    'vendor         : jw\n'
+    'packager       : Jan\n'
+    'url            : url\n'
+    'maintainer     : Jan'
+)
+
+print('All Package tests passed')