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node_modules/zone.js/lib/jasmine/jasmine.ts

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+'use strict';
+// Patch jasmine's it and fit functions so that the `done` wrapCallback always resets the zone
+// to the jasmine zone, which should be the root zone. (angular/zone.js#91)
+if (!Zone) {
+  throw new Error('zone.js does not seem to be installed');
+}
+
+var SET_TIMEOUT = '__zone_symbol__setTimeout';
+const _global = typeof window == 'undefined' ? global : window;
+
+
+// When you have in async test (test with `done` argument) jasmine will
+// execute the next test synchronously in the done handler. This makes sense
+// for most tests, but now with zones. With zones running next test
+// synchronously means that the current zone does not get cleared. This
+// results in a chain of nested zones, which makes it hard to reason about
+// it. We override the `clearStack` method which forces jasmine to always
+// drain the stack before next test gets executed.
+(<any>jasmine).QueueRunner = (function (SuperQueueRunner) {
+  // Subclass the `QueueRunner` and override the `clearStack` method.
+
+  function alwaysClearStack(fn) {
+    _global[SET_TIMEOUT](fn, 0);
+  }
+
+  function QueueRunner(options) {
+    options.clearStack = alwaysClearStack;
+    SuperQueueRunner.call(this, options);
+  }
+  QueueRunner.prototype = SuperQueueRunner.prototype;
+  return QueueRunner;
+})((<any>jasmine).QueueRunner);
+