Add expectAsync().toBePending()

src/core/matchers/async/toBePending.js

@@ -0,0 +1,25 @@
+getJasmineRequireObj().toBePending = function(j$) {
+  /**
+   * Expect a promise to be pending, ie. the promise is neither resolved nor rejected.
+   * @function
+   * @async
+   * @name async-matchers#toBePending
+   * @since 3.5.1 (should this be the next version or the version when it was added?)
+   * @example
+   * await expectAsync(aPromise).toBePending();
+   */
+  return function toBePending() {
+    return {
+      compare: function(actual) {
+        if (!j$.isPromiseLike(actual)) {
+          throw new Error('Expected toBePending to be called on a promise.');
+        }
+        var want = {};
+        return Promise.race([actual, Promise.resolve(want)]).then(
+          function(got) { return {pass: want === got}; },
+          function() { return {pass: false}; }
+        );
+      }
+    };
+  };
+};

src/core/matchers/requireAsyncMatchers.js

@@ -1,5 +1,6 @@
 getJasmineRequireObj().requireAsyncMatchers = function(jRequire, j$) {
   var availableMatchers = [
+      'toBePending',
       'toBeResolved',
       'toBeRejected',
       'toBeResolvedTo',