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vendor/bower-asset/yii2-pjax/test/unit/helpers.js

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+// Navigation helper for the test iframe. Queues navigation actions and
+// callbacks, then executes them serially with respect to async. This is to
+// avoid deep nesting of callbacks in tests.
+//
+// If a `then`able object is returned from a callback, then the navigation will
+// resume only after the promise has been resolved.
+//
+// After last successful navigation, asyncTest is automatically resumed.
+//
+// Usage:
+//
+//   navigate(this.frame)
+//   .pjax(pjaxOptions, function(frame){ ... }
+//   .back(-1, function(frame){ ... }
+//
+function navigate(frame) {
+  var queue = []
+  var api = {}
+
+  api.pjax = function(options, callback) {
+    queue.push([options, callback])
+    return api
+  }
+  api.back = api.pjax
+
+  var workOff = function() {
+    var item = queue.shift()
+    if (!item) {
+      start()
+      return
+    }
+
+    var target = item[0], callback = item[1]
+
+    frame.$(frame.document).one("pjax:end", function() {
+      var promise = callback && callback(frame)
+      if (promise && typeof promise.then == "function") promise.then(workOff)
+      else setTimeout(workOff, 0)
+    })
+
+    if (typeof target == "number") {
+      frame.history.go(target)
+    } else {
+      frame.$.pjax(target)
+    }
+  }
+
+  setTimeout(workOff, 0)
+
+  return api
+}
+
+// A poor man's Promise implementation. Only resolvable promises with no
+// reject/catch support.
+function PoorMansPromise(setup) {
+  var result, callback, i = 0, callbacks = []
+  setup(function(_result) {
+    result = _result
+    while (callback = callbacks[i++]) callback(result)
+  })
+  this.then = function(done) {
+    if (i == 0) callbacks.push(done)
+    else setTimeout(function(){ done(result) }, 0)
+    return this
+  }
+}