diff --git a/src/lint/linter/__tests__/ArcanistLinterTestCase.php b/src/lint/linter/__tests__/ArcanistLinterTestCase.php
--- a/src/lint/linter/__tests__/ArcanistLinterTestCase.php
+++ b/src/lint/linter/__tests__/ArcanistLinterTestCase.php
@@ -26,8 +26,8 @@
    * Executes all tests from the specified subdirectory. If a linter is not
    * explicitly specified, it will be inferred from the name of the test class.
    */
-  protected function executeTestsInDirectory($root) {
-    $linter = $this->getLinter();
+  protected function executeTestsInDirectory($root, ArcanistLinter $linter = null) {
+    $linter = coalesce($linter, $this->getLinter());
 
     $files = id(new FileFinder($root))
       ->withType('f')