Issue #2780703 by chx: Improve context variable names in Block UI test

core/modules/block/src/Tests/BlockUiTest.php

@@ -230,7 +230,7 @@ public function testContextAwareBlocks() {
     $this->assertTrue(!empty($definition), 'The context-aware test block exists.');
     $edit = [
       'region' => 'content',
-      'settings[context_mapping][user]' => '@block_test.multiple_static_context:user2',
+      'settings[context_mapping][user]' => '@block_test.multiple_static_context:userB',
     ];
     $this->drupalPostForm($block_url, $edit, 'Save block');
 

core/modules/block/tests/modules/block_test/src/ContextProvider/MultipleStaticContext.php

@@ -47,9 +47,9 @@ public function __construct(AccountInterface $account, EntityManagerInterface $e
   public function getRuntimeContexts(array $unqualified_context_ids) {
     $current_user = $this->userStorage->load($this->account->id());
 
-    $context1 = new Context(new ContextDefinition('entity:user', 'User 1'), $current_user);
+    $context1 = new Context(new ContextDefinition('entity:user', 'User A'), $current_user);
 
-    $context2 = new Context(new ContextDefinition('entity:user', 'User 2'), $current_user);
+    $context2 = new Context(new ContextDefinition('entity:user', 'User B'), $current_user);
 
     $cacheability = new CacheableMetadata();
     $cacheability->setCacheContexts(['user']);
@@ -58,8 +58,8 @@ public function getRuntimeContexts(array $unqualified_context_ids) {
     $context2->addCacheableDependency($cacheability);
 
     return [
-      'user1' => $context1,
-      'user2' => $context2,
+      'userA' => $context1,
+      'userB' => $context2,
     ];
   }