test(checkout): U-B143 — update LocalitiesDataTest for the value-only island (magento#3)

U-B138 projected the client island to value-only arrays but left this ViewModel
test asserting the old {value,label} shape (it wasn't in the targeted run — the
localitate e2e was). Now asserts the value-only projection. Full Otter suite
1047/1047.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: alin-vlad

app/code/Otter/HyvaCheckout/Test/Unit/ViewModel/LocalitiesDataTest.php

@@ -15,17 +15,24 @@
  */
 class LocalitiesDataTest extends TestCase
 {
-    public function testGetMapJsonReturnsValidJsonOfTheMap(): void
+    public function testGetMapJsonReturnsValueOnlyProjectionOfTheMap(): void
     {
-        $map = ['Cluj' => [['value' => 'TURDA', 'label' => 'Turda']]];
+        // U-B138 — the repo provides the full {value,label} map (its server
+        // shape), but getMapJson PROJECTS the client island to value-only arrays;
+        // locality-reset.js derives the label by title-casing the value. This
+        // ~halves the inline island.
+        $map = ['Cluj' => [
+            ['value' => 'TURDA', 'label' => 'Turda'],
+            ['value' => 'DEJ', 'label' => 'Dej'],
+        ]];
         $repo = $this->createMock(CitysRepository::class);
         $repo->method('getAllLocalitiesMap')->willReturn($map);
 
         $vm = new LocalitiesData($repo);
         $json = $vm->getMapJson();
 
         $this->assertJson($json);
-        $this->assertSame($map, json_decode($json, true));
+        $this->assertSame(['Cluj' => ['TURDA', 'DEJ']], json_decode($json, true));
     }
 
     public function testGetMapJsonReturnsEmptyObjectOnFailure(): void