Add test for read_pkg_file

setuptools/tests/test_dist.py

@@ -59,6 +59,102 @@ def test_dist_fetch_build_egg(tmpdir):
 def test_dist__get_unpatched_deprecated():
     pytest.warns(DistDeprecationWarning, _get_unpatched, [""])
 
+
+def __read_test_cases():
+    # Metadata version 1.0
+    base_attrs = {
+        "name": "package",
+        "version": "0.0.1",
+        "author": "Foo Bar",
+        "author_email": "foo@bar.net",
+        "long_description": "Long\ndescription",
+        "description": "Short description",
+        "keywords": ["one", "two"]
+    }
+
+    def merge_dicts(d1, d2):
+        d1 = d1.copy()
+        d1.update(d2)
+
+        return d1
+
+    test_cases = [
+        ('Metadata version 1.0', base_attrs.copy()),
+        ('Metadata version 1.1: Provides', merge_dicts(base_attrs, {
+            'provides': ['package']
+        })),
+        ('Metadata version 1.1: Obsoletes', merge_dicts(base_attrs, {
+            'obsoletes': ['foo']
+        })),
+        ('Metadata version 1.1: Classifiers', merge_dicts(base_attrs, {
+            'classifiers': [
+                'Programming Language :: Python :: 3',
+                'Programming Language :: Python :: 3.7',
+                'License :: OSI Approved :: MIT License'
+        ]})),
+        ('Metadata version 1.1: Download URL', merge_dicts(base_attrs, {
+            'download_url': 'https://example.com'
+        })),
+        ('Metadata Version 1.2: Requires-Python', merge_dicts(base_attrs, {
+            'python_requires': '>=3.7'
+        })),
+        pytest.param('Metadata Version 1.2: Project-Url',
+            merge_dicts(base_attrs, {
+                'project_urls': {
+                    'Foo': 'https://example.bar'
+                }
+            }), marks=pytest.mark.xfail(
+                reason="Issue #1578: project_urls not read"
+        )),
+        ('Metadata Version 2.1: Long Description Content Type',
+         merge_dicts(base_attrs, {
+             'long_description_content_type': 'text/x-rst; charset=UTF-8'
+         })),
+        pytest.param('Metadata Version 2.1: Provides Extra',
+            merge_dicts(base_attrs, {
+                'provides_extras': ['foo', 'bar']
+        }), marks=pytest.mark.xfail(reason="provides_extras not read")),
+    ]
+
+    return test_cases
+
+
+@pytest.mark.parametrize('name,attrs', __read_test_cases())
+def test_read_metadata(name, attrs, tmpdir):
+    dist = Distribution(attrs)
+    metadata_out = dist.metadata
+    dist_class = metadata_out.__class__
+
+    # Write to PKG_INFO and then load into a new metadata object
+    fn = tmpdir.mkdir('pkg_info')
+    fn_s = str(fn)
+
+    metadata_out.write_pkg_info(fn_s)
+
+    metadata_in = dist_class()
+    with io.open(str(fn.join('PKG-INFO')), 'r', encoding='utf-8') as f:
+        metadata_in.read_pkg_file(f)
+
+    tested_attrs = [
+        ('name', dist_class.get_name),
+        ('version', dist_class.get_version),
+        ('metadata_version', dist_class.get_metadata_version),
+        ('provides', dist_class.get_provides),
+        ('description', dist_class.get_description),
+        ('download_url', dist_class.get_download_url),
+        ('keywords', dist_class.get_keywords),
+        ('platforms', dist_class.get_platforms),
+        ('obsoletes', dist_class.get_obsoletes),
+        ('requires', dist_class.get_requires),
+        ('classifiers', dist_class.get_classifiers),
+        ('project_urls', lambda s: getattr(s, 'project_urls', {})),
+        ('provides_extras', lambda s: getattr(s, 'provides_extras', set())),
+    ]
+
+    for attr, getter in tested_attrs:
+        assert getter(metadata_in) == getter(metadata_out)
+
+
 def __maintainer_test_cases():
     attrs = {"name": "package",
              "version": "1.0",