fix: PromisePoolCluster.of returns PromisePoolCluster instead of Pool…

…Namespace (#3091)

test/esm/integration/pool-cluster/test-promise-wrapper.test.mjs

@@ -96,14 +96,16 @@ const { createPoolCluster } = require('../../../../promise.js');
     assert.ok(connection, 'should get connection');
     connection.release();
 
-    const [result] = await poolNamespace.query('SELECT 1 as a where 1 = ?', [
-      1,
-    ]);
+    const [result] = await poolNamespace.query(
+      'SELECT 1 as a from dual where 1 = ?',
+      [1],
+    );
     assert.equal(result[0]['a'], 1, 'should query successfully');
 
-    const [result2] = await poolNamespace.execute('SELECT 1 as a where 1 = ?', [
-      1,
-    ]);
+    const [result2] = await poolNamespace.execute(
+      'SELECT 1 as a from dual where 1 = ?',
+      [1],
+    );
     assert.equal(result2[0]['a'], 1, 'should execute successfully');
 
     poolCluster.end();