1 files changed, 23 insertions, 1 deletions
diff --git a/test/es-module/test-esm-wasm.mjs b/test/es-module/test-esm-wasm.mjs
index 46df5994af..b2218ce2f0 100644
--- a/test/es-module/test-esm-wasm.mjs
+++ b/test/es-module/test-esm-wasm.mjs
@@ -1,8 +1,10 @@
 // Flags: --experimental-wasm-modules
 import '../common/index.mjs';
+import { path } from '../common/fixtures.mjs';
 import { add, addImported } from '../fixtures/es-modules/simple.wasm';
 import { state } from '../fixtures/es-modules/wasm-dep.mjs';
-import { strictEqual } from 'assert';
+import { strictEqual, ok } from 'assert';
+import { spawn } from 'child_process';
 
 strictEqual(state, 'WASM Start Executed');
 
@@ -13,3 +15,23 @@ strictEqual(addImported(0), 42);
 strictEqual(state, 'WASM JS Function Executed');
 
 strictEqual(addImported(1), 43);
+
+// Test warning message
+const child = spawn(process.execPath, [
+  '--experimental-wasm-modules',
+  path('/es-modules/wasm-modules.mjs')
+]);
+
+let stderr = '';
+child.stderr.setEncoding('utf8');
+child.stderr.on('data', (data) => {
+  stderr += data;
+});
+child.on('close', (code, signal) => {
+  strictEqual(code, 0);
+  strictEqual(signal, null);
+  ok(stderr.toString().includes(
+    'ExperimentalWarning: Importing Web Assembly modules is ' +
+    'an experimental feature. This feature could change at any time'
+  ));
+});