Add more integration tests for py-components and examples (#709)

* Add more integration tests for py-components and examples

for more information, see https://pre-commit.ci

* remove xfail mark since we merged fix for issue 707

Co-authored-by: Fabio Pliger <fabio.pliger@gmail.com>

pyscriptjs/tests/integration/test_py_box.py

@@ -0,0 +1,18 @@
+from .support import PyScriptTest
+
+
+class TestPyButton(PyScriptTest):
+    def test_box(self):
+        self.pyscript_run(
+            """
+            <py-box>
+                <py-box>
+                </py-box>
+            </py-box>
+            """
+        )
+
+        pybox_element = self.page.query_selector_all("py-box")
+
+        assert len(pybox_element) == 2
+        assert pybox_element[1].get_attribute("class") == "py-box-child"