feat: add QueryBus helper trait for unit tests

src/Traits/QueryBusTestCaseRelated.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Onyx\Traits;
+
+use Onyx\Services\CQS\QueryBuses\InMemory;
+
+trait QueryBusTestCaseRelated
+{
+    private
+        $queryBus;
+
+    private function initializeQueryBusForTest(): void
+    {
+        $this->queryBus = new InMemory();
+    }
+
+    private function assertQueriesHaveBeenSent(array $expectedQueryTypes): void
+    {
+        foreach($expectedQueryTypes as $queryType)
+        {
+            $this->assertQueryHasBeenSent($queryType);
+        }
+    }
+
+    private function assertQueryHasBeenSent(string $queryType): void
+    {
+        foreach($this->queryBus->getSentQueries() as $query)
+        {
+            if($query instanceof $queryType)
+            {
+                $this->addToAssertionCount(1);
+
+                return;
+            }
+        }
+
+        $this->fail(sprintf(
+            "Failed to assert that query of type %s has been sent",
+            $queryType
+        ));
+    }
+}