add test for typeof proxy (#2438)

test/language/expressions/typeof/proxy.js

@@ -0,0 +1,41 @@
+// Copyright (C) 2019 Ecma International. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+  The typeof operator on an proxy should match the typeof value the proxy wraps,
+  even if the proxy is later revoked.
+esid: sec-typeof-operator
+info: |
+  The typeof Operator
+
+  Runtime Semantics: Evaluation
+
+    ...
+    Return a String according to Table 35.
+
+  #table-35
+
+  Object (does not implement [[Call]]) "object"
+  Object (implements [[Call]]) "function"
+
+
+  ProxyCreate ( target, handler )
+    ...
+    7. If IsCallable(target) is true, then
+       a. Set P.[[Call]] as specified in 9.5.12.
+    ...
+features: [Proxy]
+---*/
+
+assert.sameValue(typeof new Proxy({}, {}), 'object');
+
+assert.sameValue(typeof new Proxy(function() {}, {}), 'function');
+
+const rp1 = Proxy.revocable({}, {});
+rp1.revoke();
+assert.sameValue(typeof rp1.proxy, 'object');
+
+const rp2 = Proxy.revocable(function() {}, {});
+rp2.revoke();
+assert.sameValue(typeof rp2.proxy, 'function');