Handle WebSocket events in IE when detecting Errors

- Fixes #1623

spec/core/baseSpec.js

@@ -0,0 +1,30 @@
+describe('base helpers', function() {
+  describe('isError_', function() {
+    fit("correctly handles WebSocket events", function(done) {
+      if (typeof jasmine.getGlobal().WebSocket === 'undefined') {
+        done();
+        return;
+      }
+
+      var obj = (function() {
+        var sock = new WebSocket('ws://localhost');
+        var event;
+        sock.onerror = function(e) {
+          event = e
+        };
+        return function() { return event };
+      })();
+      var left = 20;
+
+      var int = setInterval(function() {
+        if (obj() || left === 0) {
+          var result = jasmineUnderTest.isError_(obj());
+          expect(result).toBe(false);
+          done();
+        } else {
+          left--;
+        }
+      }, 100);
+    });
+  });
+});

src/core/base.js

@@ -89,9 +89,15 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     if (value instanceof Error) {
       return true;
     }
-    if (value && value.constructor && value.constructor.constructor &&
-      (value instanceof (value.constructor.constructor('return this')()).Error)) {
-      return true;
+    if (value && value.constructor && value.constructor.constructor) {
+      var valueGlobal = value.constructor.constructor('return this');
+      if (j$.isFunction_(valueGlobal)) {
+        valueGlobal = valueGlobal();
+      }
+
+      if (valueGlobal.Error && value instanceof valueGlobal.Error) {
+        return true;
+      }
     }
     return false;
   };