test: test IntSlider bug to avoid regression

test #3597

.github/workflows/tests.yml

@@ -105,6 +105,8 @@ jobs:
           python -m pip install --upgrade pip
           pip install file://$PWD/python/ipywidgets#egg=ipywidgets[test]
       - name: Test with pytest
+        env:
+          SOLARA_TEST_RUNNERS: "jupyter_notebook,jupyter_lab"
         run: |
           pip install pytest
           cd python/ipywidgets

python/ipywidgets/ipywidgets/widgets/tests/test_slider.py

@@ -0,0 +1,37 @@
+import playwright.async_api
+from IPython.display import display
+
+
+def center(locator):
+    box = locator.bounding_box()
+    x, y = box["x"] + box["width"] / 2, box["y"] + box["height"] / 2
+    return x, y
+
+
+def test_slider_tap(ipywidgets_runner, page_session: playwright.sync_api.Page):
+    def kernel():
+        import ipywidgets as widgets
+
+        slider = widgets.IntSlider(
+            continuous_update=False,
+        )
+        text = widgets.HTML(value="Nothing happened")
+
+        def echo(change):
+            if change["new"] > 0:
+                text.value = "slider is greater than 0"
+            else:
+                text.value = "slider is 0"
+
+        slider.observe(echo, names="value")
+        slider.add_class("slider-test")
+        text.add_class("text-test")
+        display(slider)
+        display(text)
+
+    ipywidgets_runner(kernel)
+    text = page_session.locator(".text-test")
+    slider = page_session.wait_for_selector(".slider-test")
+    x, y = center(slider)
+    page_session.mouse.click(x, y)
+    text.locator("text=slider is greater than 0").wait_for()

python/ipywidgets/setup.cfg

@@ -47,6 +47,7 @@ test =
   pytest>=3.6.0
   pytest-cov
   pytz
+  solara[pytest]
 
 [options.package_data]
 ipywidgets =