Add shiny/examples e2e test

Author: jcheng5

e2e/input_numeric/test_input_numeric.py

@@ -0,0 +1,18 @@
+from playwright.sync_api import Page, expect
+from conftest import ShinyAppProc, create_doc_example_fixture
+import controls
+
+app = create_doc_example_fixture("input_numeric")
+
+
+def test_input_numeric(page: Page, app: ShinyAppProc) -> None:
+    page.goto(app.url)
+
+    obs = controls.NumericInput(page, "obs")
+    obs.expect.to_have_value("10")
+    output = page.locator("#value")
+    expect(output).to_have_text("10")
+
+    obs.loc.fill("21")
+    obs.expect.to_have_value("21")
+    expect(output).to_have_text("21")