1 files changed, 24 insertions, 0 deletions
diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index 4c78a5cf5..e4d670935 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -3823,6 +3823,30 @@ itest!(error_cause_recursive {
   exit_code: 1,
 });
 
+itest!(default_file_extension_is_js {
+  args: "run --check file_extensions/js_without_extension",
+  output: "file_extensions/js_without_extension.out",
+  exit_code: 0,
+});
+
+itest!(js_without_extension {
+  args: "run --ext js --check file_extensions/js_without_extension",
+  output: "file_extensions/js_without_extension.out",
+  exit_code: 0,
+});
+
+itest!(ts_without_extension {
+  args: "run --ext ts file_extensions/ts_without_extension",
+  output: "file_extensions/ts_without_extension.out",
+  exit_code: 0,
+});
+
+itest!(ext_flag_takes_precedence_over_extension {
+  args: "run --ext ts file_extensions/ts_with_js_extension.js",
+  output: "file_extensions/ts_with_extension.out",
+  exit_code: 0,
+});
+
 #[test]
 fn websocket() {
   let _g = util::http_server();