diff --git a/crates/js-sys/tests/all/Intl.rs b/crates/js-sys/tests/all/Intl.rs
deleted file mode 100644
index b9954469..00000000
--- a/crates/js-sys/tests/all/Intl.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-#![allow(non_snake_case)]
-
-use project;
-
-#[test]
-fn get_canonical_locales() {
-    project()
-        .file("src/lib.rs", r#"
-            #![feature(use_extern_macros)]
-
-            extern crate wasm_bindgen;
-            extern crate js_sys;
-            use wasm_bindgen::prelude::*;
-
-            #[wasm_bindgen]
-            pub fn get_canonical_locales(v: &JsValue) -> js_sys::Array {
-                js_sys::Intl::get_canonical_locales(v)
-            }
-        "#)
-        .file("test.js", r#"
-            import * as assert from "assert";
-            import * as wasm from "./out";
-
-            export function test() {
-                let locales = ["EN-US", "Fr"];
-                let canonical_locales = wasm.get_canonical_locales(locales);
-                assert.deepStrictEqual(canonical_locales, ["en-US", "fr"]);
-
-                let single_locale = wasm.get_canonical_locales("EN-US");
-                assert.equal(single_locale, "en-US");
-            }
-        "#)
-        .test()
-}
\ No newline at end of file
diff --git a/crates/js-sys/tests/all/main.rs b/crates/js-sys/tests/all/main.rs
index 51b06e58..fafd6db9 100644
--- a/crates/js-sys/tests/all/main.rs
+++ b/crates/js-sys/tests/all/main.rs
@@ -11,7 +11,6 @@ fn project() -> project_builder::Project {
 // Keep these tests in alphabetical order, just like the imports in `src/js.rs`.
 
 mod ArrayIterator;
-mod Intl;
 mod JsString;
 mod Map;
 mod MapIterator;
diff --git a/crates/js-sys/tests/wasm/Intl.rs b/crates/js-sys/tests/wasm/Intl.rs
new file mode 100644
index 00000000..208dd6a2
--- /dev/null
+++ b/crates/js-sys/tests/wasm/Intl.rs
@@ -0,0 +1,25 @@
+use wasm_bindgen::JsValue;
+use wasm_bindgen_test::*;
+use js_sys::*;
+
+#[wasm_bindgen_test]
+fn get_canonical_locales() {
+    let locales = Array::new();
+    locales.push("EN-US".into());
+    locales.push("Fr".into());
+    let locales = JsValue::from(locales);
+    let canonical_locales = Intl::get_canonical_locales(&locales);
+    assert_eq!(canonical_locales.length(), 2);
+    canonical_locales.for_each(&mut |l, i, _| {
+        if i == 0 {
+            assert_eq!(l, "en-US");
+        } else {
+            assert_eq!(l, "fr");
+        }
+    });
+    let canonical_locales = Intl::get_canonical_locales(&"EN-US".into());
+    assert_eq!(canonical_locales.length(), 1);
+    canonical_locales.for_each(&mut |l, _, _| {
+        assert_eq!(l, "en-US");
+    });
+}
diff --git a/crates/js-sys/tests/wasm/main.rs b/crates/js-sys/tests/wasm/main.rs
index e0e41ec4..e71e2488 100644
--- a/crates/js-sys/tests/wasm/main.rs
+++ b/crates/js-sys/tests/wasm/main.rs
@@ -15,3 +15,4 @@ pub mod Date;
 pub mod Error;
 pub mod Function;
 pub mod Generator;
+pub mod Intl;