diff --git a/tests/ExecutorTest.php b/tests/ExecutorTest.php
index 7d04e9b1..5b2ef42a 100644
--- a/tests/ExecutorTest.php
+++ b/tests/ExecutorTest.php
@@ -126,6 +126,7 @@ public function testLogStream(): void
 
             if (!\is_null($previousTimestamp)) {
                 $this->assertGreaterThanOrEqual($previousTimestamp, $streamChunk['timestamp']);
+                $this->assertStringStartsWith('Preparing for build', $streamChunk['content']);
             } else {
                 $firstTimestamp = null;
             }