1 files changed, 5 insertions, 1 deletions
diff --git a/prettier/main_test.ts b/prettier/main_test.ts
index 0d6015080..10ad79e36 100644
--- a/prettier/main_test.ts
+++ b/prettier/main_test.ts
@@ -48,7 +48,11 @@ async function clearTestdataChanges(): Promise<void> {
 test(async function testPrettierCheckAndFormatFiles() {
   await clearTestdataChanges();
 
-  const files = [join(testdata, "0.ts"), join(testdata, "1.js")];
+  const files = [
+    join(testdata, "0.ts"),
+    join(testdata, "1.js"),
+    join(testdata, "2.ts")
+  ];
 
   var { code, stdout } = await run([...cmd, "--check", ...files]);
   assertEquals(code, 1);