diff --git a/tests/IntegrationTest/PlayNiceWithScriptsTest.php b/tests/IntegrationTest/PlayNiceWithScriptsTest.php
index 9efaae0c..e741eb1c 100644
--- a/tests/IntegrationTest/PlayNiceWithScriptsTest.php
+++ b/tests/IntegrationTest/PlayNiceWithScriptsTest.php
@@ -86,15 +86,18 @@ public function testScriptsAreNotBlockedFromRunning($command, $expectedOutputs)
 
         $this->assertSame(0, $result['exitcode'], 'Exitcode for initial composer install did not match 0');
 
-        $this->assertStringContainsString(
-            Plugin::MESSAGE_RUNNING_INSTALLER,
-            $result['stdout'],
-            'Output from initial composer install missing expected contents.'
-        );
+        if ($this->willPluginOutputShow()) {
+            $this->assertStringContainsString(
+                Plugin::MESSAGE_RUNNING_INSTALLER,
+                $result['stdout'],
+                'Output from initial composer install missing expected contents.'
+            );
+        }
 
+        $output = $this->willPluginOutputShow() ? $result['stdout'] : $result['stderr'];
         $this->assertStringContainsString(
             'post-update-cmd successfully run',
-            $result['stdout'],
+            $output,
             'Output from initial composer install missing expected contents.'
         );