ADD TO: tests

Author: jrfnl

tests/Core/Util/ExitCode/ExitCodeTest.php

@@ -156,7 +156,12 @@ public function testPhpcsWithCache($extraArgs, $expected)
         $extraArgs[] = '--cache='.self::CACHE_FILE;
 
         // Make sure we start without a cache.
-        $this->assertFileDoesNotExist(self::CACHE_FILE);
+        if (method_exists($this, 'assertFileDoesNotExist') === true) {
+            $this->assertFileDoesNotExist(self::CACHE_FILE);
+        } else {
+            // PHPUnit < 9.1.0.
+            $this->assertFileNotExists(self::CACHE_FILE);
+        }
 
         // First run with these arguments to create the cache.
         $this->runPhpcsAndCheckExitCode($extraArgs, $expected);