1 files changed, 46 insertions, 0 deletions
diff --git a/testing/webcompat/interventions/tests/test_1786404_business_help_royalmail_com.py b/testing/webcompat/interventions/tests/test_1786404_business_help_royalmail_com.py
new file mode 100644
index 0000000000..01ca2ddcc2
--- /dev/null
+++ b/testing/webcompat/interventions/tests/test_1786404_business_help_royalmail_com.py
@@ -0,0 +1,46 @@
+import pytest
+
+URL = "https://business.help.royalmail.com/app/webforms/stampsenquiries"
+
+COOKIES_ACCEPT_CSS = "#consent_prompt_submit"
+POSTCODE_CSS = "input[name='rn_AddressControl_16textbox']"
+OPTION_CSS = "option.addr_pick_line:not(:disabled)"
+ADDY1_CSS = "[name='Incident.CustomFields.c.address1_1']"
+
+
+async def getResult(client):
+    await client.navigate(URL)
+    client.await_css(COOKIES_ACCEPT_CSS).click()
+    client.execute_script(
+        f"""
+      const proto = EventTarget.prototype;
+      const def = Object.getOwnPropertyDescriptor(proto, "addEventListener");
+      const old = def.value;
+      def.value = function(type) {{
+        if (type === "click" && this?.matches("{OPTION_CSS}")) {{
+          window.__expectedListenerAdded = true;
+        }}
+      }};
+      Object.defineProperty(proto, "addEventListener", def);
+    """
+    )
+
+    client.await_css(POSTCODE_CSS).send_keys("W1A 1AV")
+    client.await_css(OPTION_CSS)
+    return client.execute_script(
+        """
+        return Boolean(window.__expectedListenerAdded);
+    """
+    )
+
+
+@pytest.mark.asyncio
+@pytest.mark.with_interventions
+async def test_enabled(client):
+    assert await getResult(client)
+
+
+@pytest.mark.asyncio
+@pytest.mark.without_interventions
+async def test_disabled(client):
+    assert not await getResult(client)