Merge pull request #5162 from pradyunsg/fix/5160

Use all available distributions

src/pip/_internal/operations/check.py

@@ -30,6 +30,9 @@ def create_package_set_from_installed(**kwargs):
     # type: (**Any) -> PackageSet
     """Converts a list of distributions into a PackageSet.
     """
+    # Default to using all packages installed on the system
+    if kwargs == {}:
+        kwargs = {"local_only": False, "skip": ()}
     retval = {}
     for dist in get_installed_distributions(**kwargs):
         name = canonicalize_name(dist.project_name)

tests/unit/test_check.py

+"""Unit Tests for pip's dependency checking logic
+"""
+
+import mock
+from pip._internal.operations import check
+
+
+class TestInstalledDistributionsCall(object):
+
+    def test_passes_correct_default_kwargs(self, monkeypatch):
+        my_mock = mock.MagicMock(return_value=[])
+        monkeypatch.setattr(check, "get_installed_distributions", my_mock)
+
+        check.create_package_set_from_installed()
+
+        my_mock.assert_called_with(local_only=False, skip=())
+
+    def test_passes_any_given_kwargs(self, monkeypatch):
+        my_mock = mock.MagicMock(return_value=[])
+        monkeypatch.setattr(check, "get_installed_distributions", my_mock)
+
+        obj = object()
+        check.create_package_set_from_installed(hi=obj)
+
+        my_mock.assert_called_with(hi=obj)