Add resolveValue and rejectValue spy strategies

src/core/Env.js

@@ -76,7 +76,16 @@ getJasmineRequireObj().Env = function(j$) {
        * @type Boolean
        * @default false
        */
-      hideDisabled: false
+      hideDisabled: false,
+      /**
+       * Set to provide a custom promise library that Jasmine will use if it needs
+       * to create a promise. If not set, it will default to whatever global promise
+       * library is available (if any).
+       * @name Configuration#promiseLibrary
+       * @type function
+       * @default undefined
+       */
+      promiseLibrary: undefined
     };
 
     var currentSuite = function() {
@@ -142,6 +151,15 @@ getJasmineRequireObj().Env = function(j$) {
       if (configuration.hasOwnProperty('hideDisabled')) {
         config.hideDisabled = configuration.hideDisabled;
       }
+
+      if (configuration.hasOwnProperty('promiseLibrary')) {
+        if (typeof configuration.promiseLibrary.resolve === 'function' &&
+            typeof configuration.promiseLibrary.reject === 'function') {
+          config.promiseLibrary = configuration.promiseLibrary;
+        } else {
+          throw new Error('Custom promise library missing `resolve`/`reject` functions');
+        }
+      }
     };
 
     /**
@@ -193,6 +211,10 @@ getJasmineRequireObj().Env = function(j$) {
       }
     };
 
+    this.getPromise = function() {
+      return config.promiseLibrary;
+    };
+
     j$.Expectation.addCoreMatchers(j$.matchers);
     j$.Expectation.addAsyncCoreMatchers(j$.asyncMatchers);
 

src/core/SpyStrategy.js

@@ -84,6 +84,44 @@ getJasmineRequireObj().SpyStrategy = function(j$) {
     return this.getSpy();
   };
 
+  /**
+   * Tell the spy to return a promise resolving to the specified value when invoked.
+   * @name SpyStrategy#resolveValue
+   * @function
+   * @param {*} value The value to return.
+   */
+  SpyStrategy.prototype.resolveValue = function(value) {
+    var Promise = j$.getPromise();
+
+    if (!Promise) {
+      throw new Error('resolveValue is unavailable because the environment does not support promises.');
+    }
+
+    this.plan = function() {
+      return Promise.resolve(value);
+    };
+    return this.getSpy();
+  };
+
+  /**
+   * Tell the spy to return a promise rejecting with the specified value when invoked.
+   * @name SpyStrategy#rejectValue
+   * @function
+   * @param {*} value The value to return.
+   */
+  SpyStrategy.prototype.rejectValue = function(value) {
+    var Promise = j$.getPromise();
+
+    if (!Promise) {
+      throw new Error('rejectValue is unavailable because the environment does not support promises.');
+    }
+
+    this.plan = function() {
+      return Promise.reject(value);
+    };
+    return this.getSpy();
+  };
+
   /**
    * Tell the spy to throw an error when invoked.
    * @name SpyStrategy#throwError

src/core/base.js

@@ -45,6 +45,10 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     return env;
   };
 
+  j$.getPromise = function() {
+    return j$.getEnv().getPromise() || j$.getGlobal().Promise;
+  };
+
   j$.isArray_ = function(value) {
     return j$.isA_('Array', value);
   };