diff --git a/crates/webidl-tests/main.rs b/crates/webidl-tests/main.rs
index 2a31140b..12635f50 100644
--- a/crates/webidl-tests/main.rs
+++ b/crates/webidl-tests/main.rs
@@ -10,3 +10,4 @@ pub mod consts;
 pub mod enums;
 pub mod simple;
 pub mod throws;
+pub mod namespace;
diff --git a/crates/webidl-tests/namespace.js b/crates/webidl-tests/namespace.js
new file mode 100644
index 00000000..a3b83d1f
--- /dev/null
+++ b/crates/webidl-tests/namespace.js
@@ -0,0 +1,11 @@
+const strictEqual = require('assert').strictEqual;
+
+global.math = class {
+    powf(base, exp) {
+        return Math.pow(base, exp);
+    }
+
+    add_one(val) {
+        return val + 1;
+    }
+};
diff --git a/crates/webidl-tests/namespace.rs b/crates/webidl-tests/namespace.rs
new file mode 100644
index 00000000..848239aa
--- /dev/null
+++ b/crates/webidl-tests/namespace.rs
@@ -0,0 +1,10 @@
+use wasm_bindgen_test::*;
+
+include!(concat!(env!("OUT_DIR"), "/namespace.rs"));
+
+#[wasm_bindgen_test]
+fn simple_namespace_test() {
+    assert_eq!(math::add_one(1), 2);
+    assert_eq!(math::powf(1.0, 100.0), 1.0);
+    assert_eq!(math::powf(10.0, 2.0), 100.0);
+}
diff --git a/crates/webidl-tests/namespace.webidl b/crates/webidl-tests/namespace.webidl
new file mode 100644
index 00000000..c42a4cf6
--- /dev/null
+++ b/crates/webidl-tests/namespace.webidl
@@ -0,0 +1,4 @@
+namespace math {
+    long add_one(long val);
+    double powf(double base, double exponent);
+};