From 4eb5eadcf89b1c12cd7cbb74e16f0e6ccb1e42d9 Mon Sep 17 00:00:00 2001
From: Mat Moore <MatMoore@users.noreply.github.com>
Date: Mon, 26 Feb 2024 09:44:40 +0000
Subject: [PATCH] Add test

---
 tests/javascript/test_enhanced_search.js | 44 ++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/tests/javascript/test_enhanced_search.js b/tests/javascript/test_enhanced_search.js
index 4920b383..83d7ae8c 100644
--- a/tests/javascript/test_enhanced_search.js
+++ b/tests/javascript/test_enhanced_search.js
@@ -12,6 +12,7 @@ const widget_html = `
                 <option value="*">All domains</option>
                 <option value="a">Domain A</option>
                 <option value="b">Domain B</option>
+                <option value="c">Domain C</option>
             </select>
         </div>
         <div class="govuk-form-group js-required">
@@ -49,6 +50,47 @@ describe("initialisation", () => {
   });
 });
 
+describe("after selecting a domain with no subdomains", () => {
+  beforeEach(() => {
+    document.body.innerHTML = widget_html;
+
+    subdomainFilter = document.querySelector("#subdomains-filter");
+    domainFilter = document.querySelector("#domains-filter");
+
+    initDomainFilter();
+
+    // Listen to outgoing events
+    domainFilter.parentElement.addEventListener(
+      "domain-filter-updates",
+      eventSpy
+    );
+
+    // Emulate selecting a domain
+    domainFilter.value = "c";
+    domainFilter.dispatchEvent(new Event("change"));
+  });
+
+  test("selects all subdomains", () => {
+    expect(subdomainFilter.value).toEqual("*");
+  });
+
+  test("only the all subdomains option is available", () => {
+    const options = subdomainFilter.querySelectorAll("option");
+
+    const values = Array.from(options).map((el) => el.value);
+
+    expect(values).toEqual(["*"]);
+  });
+
+  test("fires an event with the selected domain/subdomain pair", () => {
+    expect(eventSpy.mock.calls[0][0].detail).toEqual({
+      topLevelDomainValue: "c",
+      subdomainValue: null,
+      label: "Domain C",
+    });
+  });
+});
+
 describe("after selecting a domain", () => {
   beforeEach(() => {
     document.body.innerHTML = widget_html;
@@ -162,5 +204,3 @@ describe("after selecting a domain", () => {
     });
   });
 });
-
-// TODO: clear selected subdomain when choosing parent domain