Add expected failure for #2179.

tests/integration/test_upgrade.py

@@ -0,0 +1,43 @@
+import sys
+
+import pytest
+
+from pipenv.vendor import pathlib2 as pathlib
+
+
+@pytest.mark.install
+@pytest.mark.update
+@pytest.mark.graph
+@pytest.mark.xfail(strict=True, reason='expected as reported in #2179')
+def test_upgrade_gh2179(PipenvInstance, pypi):
+    """Ensure upgrade gives a newer version than before.
+
+    https://github.com/pypa/pipenv/issues/2179
+    """
+    with PipenvInstance(pypi=pypi, chdir=True) as p:
+        # Install an old version of requests.
+        c = p.pipenv('install requests==2.14.0')
+        assert c.return_code == 0
+
+        # Ensure the version is correct (old).
+        pipfile_content = pathlib.Path('Pipfile').read_text(encoding='utf-8')
+        assert 'requests = "==2.14.0"' in pipfile_content
+
+        # Rewrite version to "*" to get the latest version.
+        pipfile_content = pipfile_content.replace('==2.14.0', '*', 1)
+        pathlib.Path('Pipfile').write_text(pipfile_content, encoding='utf-8')
+
+        # Ensure --outdated reports correctly.
+        c = p.pipenv('update --outdated')
+        assert c.return_code == 1   # Errors if there are outdated packages.
+        assert "'==2.14.0' installed, '==2.18.4' available." in c.out
+
+        # Try to upgrade.
+        c = p.pipenv('update requests')
+        assert c.return_code == 0
+
+        # Ensure requests is actually upgraded.
+        # FIXME: This fails. requests will not be updated, staying at 2.14.0.
+        c = p.pipenv('graph')
+        assert c.return_code == 0
+        assert 'requests==2.18.4' in c.out