5 files changed, 25 insertions, 0 deletions
diff --git a/cli/tests/integration/run_tests.rs b/cli/tests/integration/run_tests.rs
index 0ddedbdfb..4ac18cd50 100644
--- a/cli/tests/integration/run_tests.rs
+++ b/cli/tests/integration/run_tests.rs
@@ -4716,3 +4716,17 @@ itest!(workspaces_nested_member {
   http_server: true,
   exit_code: 1,
 });
+
+itest!(unsafe_proto {
+  args: "run -A run/unsafe_proto/main.js",
+  output: "run/unsafe_proto/main.out",
+  http_server: false,
+  exit_code: 0,
+});
+
+itest!(unsafe_proto_flag {
+  args: "run -A --unstable-unsafe-proto run/unsafe_proto/main.js",
+  output: "run/unsafe_proto/main_with_unsafe_proto_flag.out",
+  http_server: false,
+  exit_code: 0,
+});
diff --git a/cli/tests/testdata/run/unsafe_proto/main.js b/cli/tests/testdata/run/unsafe_proto/main.js
new file mode 100644
index 000000000..eb95c55a0
--- /dev/null
+++ b/cli/tests/testdata/run/unsafe_proto/main.js
@@ -0,0 +1,5 @@
+console.log(Object.hasOwn(Object.prototype, "__proto__"));
+
+new Worker(import.meta.resolve("./worker.js"), {
+  type: "module",
+});
diff --git a/cli/tests/testdata/run/unsafe_proto/main.out b/cli/tests/testdata/run/unsafe_proto/main.out
new file mode 100644
index 000000000..4b095fd0f
--- /dev/null
+++ b/cli/tests/testdata/run/unsafe_proto/main.out
@@ -0,0 +1,2 @@
+false
+false
diff --git a/cli/tests/testdata/run/unsafe_proto/main_with_unsafe_proto_flag.out b/cli/tests/testdata/run/unsafe_proto/main_with_unsafe_proto_flag.out
new file mode 100644
index 000000000..bb101b641
--- /dev/null
+++ b/cli/tests/testdata/run/unsafe_proto/main_with_unsafe_proto_flag.out
@@ -0,0 +1,2 @@
+true
+true
diff --git a/cli/tests/testdata/run/unsafe_proto/worker.js b/cli/tests/testdata/run/unsafe_proto/worker.js
new file mode 100644
index 000000000..b22bc8713
--- /dev/null
+++ b/cli/tests/testdata/run/unsafe_proto/worker.js
@@ -0,0 +1,2 @@
+console.log(Object.hasOwn(Object.prototype, "__proto__"));
+close();