Add m-esr52 at 52.6.0

1 files changed, 59 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Object/propertyIsEnumerable-proxy.js b/js/src/tests/ecma_6/Object/propertyIsEnumerable-proxy.js
new file mode 100644
index 000000000..a1dda90e0
--- /dev/null
+++ b/js/src/tests/ecma_6/Object/propertyIsEnumerable-proxy.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function logProxy(object) {
+    var log = [];
+    var handler = {
+        getOwnPropertyDescriptor(target, propertyKey) {
+            log.push(propertyKey);
+            return Object.getOwnPropertyDescriptor(target, propertyKey);
+        }
+    };
+    var proxy = new Proxy(object, new Proxy(handler, {
+        get(target, propertyKey, receiver) {
+            if (!(propertyKey in target)) {
+                throw new Error(`Unexpected call to trap: "${propertyKey}"`);
+            }
+            return target[propertyKey];
+        }
+    }));
+    return {proxy, log};
+}
+
+var properties = ["string-property"];
+if (typeof Symbol === 'function')
+    properties.push(Symbol("symbol-property"));
+
+for (var property of properties) {
+    // Test 1: property is not present on object
+    var {proxy, log} = logProxy({});
+    var result = Object.prototype.propertyIsEnumerable.call(proxy, property);
+    assertEq(result, false);
+    assertDeepEq(log, [property]);
+
+    // Test 2: property is present on object and enumerable
+    var {proxy, log} = logProxy({[property]: 0});
+    var result = Object.prototype.propertyIsEnumerable.call(proxy, property);
+    assertEq(result, true);
+    assertDeepEq(log, [property]);
+
+    // Test 3: property is present on object, but not enumerable
+    var {proxy, log} = logProxy(Object.defineProperty({[property]: 0}, property, {enumerable: false}));
+    var result = Object.prototype.propertyIsEnumerable.call(proxy, property);
+    assertEq(result, false);
+    assertDeepEq(log, [property]);
+
+    // Test 4: property is present on prototype object
+    var {proxy, log} = logProxy(Object.create({[property]: 0}));
+    var result = Object.prototype.propertyIsEnumerable.call(proxy, property);
+    assertEq(result, false);
+    assertDeepEq(log, [property]);
+
+    // Test 5: property is present on prototype object, prototype is proxy object
+    var {proxy, log} = logProxy({[property]: 0});
+    var result = Object.prototype.propertyIsEnumerable.call(Object.create(proxy), property);
+    assertEq(result, false);
+    assertDeepEq(log, []);
+}
+
+reportCompare(0, 0);