PY-47941 Add a test on completion of pytest.mark

The problem itself was fixed together with PY-48219 by switching to types to
find possible attributes of a module/package.

GitOrigin-RevId: 587b1c96610375836417655f0feb74f38edb4c69

python/testData/completion/notImportedQualifiedName/AttributeReExportedWithAlias/_pytest/mark.py

@@ -0,0 +1,2 @@
+MARK_GEN = ...
+param = ...

python/testData/completion/notImportedQualifiedName/AttributeReExportedWithAlias/main.py

@@ -0,0 +1,3 @@
+@pytest.<caret>
+def test():
+    pass

python/testData/completion/notImportedQualifiedName/AttributeReExportedWithAlias/pytest/__init__.py

@@ -0,0 +1,2 @@
+from _pytest.mark import MARK_GEN as mark
+from _pytest.mark import param

python/testSrc/com/jetbrains/python/PyNotImportedQualifiedNameCompletionTest.java

@@ -161,6 +161,11 @@ public class PyNotImportedQualifiedNameCompletionTest extends PyTestCase {
     assertContainsElements(doBasicCompletion(), "nspkg.submod", "nspkg.subpkg");
   }
 
+  // PY-47941
+  public void testAttributeReExportedWithAlias() {
+    assertContainsElements(doBasicCompletion(), "pytest.mark", "pytest.param");
+  }
+
   @Nullable
   private List<String> doBasicCompletion() {
     myFixture.copyDirectoryToProject(getTestName(false), "");