4 files changed, 11 insertions, 0 deletions
diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index 819ccda72..ae905840d 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -1568,6 +1568,13 @@ itest!(top_level_for_await_ts {
   output: "top_level_for_await.out",
 });
 
+itest!(unstable {
+  args: "run unstable.js",
+  check_stderr: true,
+  exit_code: 70,
+  output: "unstable.out",
+});
+
 itest!(_053_import_compression {
   args: "run --reload --allow-net 053_import_compression/main.ts",
   output: "053_import_compression.out",
diff --git a/cli/tests/std_tests.rs b/cli/tests/std_tests.rs
index 32906c2fa..f5b1f1998 100644
--- a/cli/tests/std_tests.rs
+++ b/cli/tests/std_tests.rs
@@ -18,6 +18,7 @@ mod tests {
     let mut deno = deno_cmd
       .current_dir(cwd) // note: std tests expect to run from "std" dir
       .arg("test")
+      .arg("--unstable")
       .arg("--seed=86") // Some tests rely on specific random numbers.
       .arg("-A")
       // .arg("-Ldebug")
diff --git a/cli/tests/unstable.js b/cli/tests/unstable.js
new file mode 100644
index 000000000..e6f2274cd
--- /dev/null
+++ b/cli/tests/unstable.js
@@ -0,0 +1,2 @@
+// This program should require the --unstable flag
+Deno.openPlugin("foo");
diff --git a/cli/tests/unstable.out b/cli/tests/unstable.out
new file mode 100644
index 000000000..31fead7d9
--- /dev/null
+++ b/cli/tests/unstable.out
@@ -0,0 +1 @@
+Unstable API 'Deno.openPlugin'. The --unstable flag must be provided.