Add a failing integration test. Ref #4976

Author: jaraco

setuptools/tests/integration/test_pbr.py

@@ -0,0 +1,20 @@
+import subprocess
+
+import pytest
+
+
+@pytest.mark.xfail(reason="#4976")
+def test_pbr_integration(pbr_package, venv):
+    """Ensure pbr packages install."""
+    cmd = [
+        'python',
+        '-m',
+        'pip',
+        '-v',
+        'install',
+        '--no-build-isolation',
+        pbr_package,
+    ]
+    venv.run(cmd, stderr=subprocess.STDOUT)
+    out = venv.run(["python", "-c", "import mypkg.hello"])
+    assert "Hello world!" in out