Allow adding custom spy strategies

[#37288941]

lib/jasmine-core/jasmine.js

@@ -797,6 +797,13 @@ getJasmineRequireObj().Env = function(j$) {
       return true;
     };
 
+    this.addSpyStrategy = function(name, fn) {
+      if(!currentRunnable()) {
+        throw new Error('Custom spy strategies must be added in a before function or a spec');
+      }
+      runnableResources[currentRunnable().id].customSpyStrategies[name] = fn;
+    };
+
     this.addCustomEqualityTester = function(tester) {
       if(!currentRunnable()) {
         throw new Error('Custom Equalities must be added in a before function or a spec');
@@ -841,7 +848,7 @@ getJasmineRequireObj().Env = function(j$) {
     };
 
     var defaultResourcesForRunnable = function(id, parentRunnableId) {
-      var resources = {spies: [], customEqualityTesters: [], customMatchers: {}};
+      var resources = {spies: [], customEqualityTesters: [], customMatchers: {}, customSpyStrategies: {}};
 
       if(runnableResources[parentRunnableId]){
         resources.customEqualityTesters = j$.util.clone(runnableResources[parentRunnableId].customEqualityTesters);
@@ -1082,7 +1089,15 @@ getJasmineRequireObj().Env = function(j$) {
       reporter.clearReporters();
     };
 
-    var spyFactory = new j$.SpyFactory();
+    var spyFactory = new j$.SpyFactory(function() {
+      var runnable = currentRunnable();
+
+      if (runnable) {
+        return runnableResources[runnable.id].customSpyStrategies;
+      }
+
+      return {};
+    });
 
     var spyRegistry = new j$.SpyRegistry({
       currentSpies: function() {
@@ -4919,7 +4934,7 @@ getJasmineRequireObj().Spy = function (j$) {
    * @constructor
    * @name Spy
    */
-  function Spy(name, originalFn) {
+  function Spy(name, originalFn, customStrategies) {
     var numArgs = (typeof originalFn === 'function' ? originalFn.length : 0),
       wrapper = makeFunc(numArgs, function () {
         return spy.apply(this, Array.prototype.slice.call(arguments));
@@ -4929,7 +4944,8 @@ getJasmineRequireObj().Spy = function (j$) {
         fn: originalFn,
         getSpy: function () {
           return wrapper;
-        }
+        },
+        customStrategies: customStrategies
       }),
       callTracker = new j$.CallTracker(),
       spy = function () {
@@ -5069,11 +5085,11 @@ getJasmineRequireObj().Spy = function (j$) {
 
 getJasmineRequireObj().SpyFactory = function(j$) {
 
-  function SpyFactory() {
+  function SpyFactory(getCustomStrategies) {
     var self = this;
 
     this.createSpy = function(name, originalFn) {
-      return j$.Spy(name, originalFn);
+      return j$.Spy(name, originalFn, getCustomStrategies());
     };
   
     this.createSpyObj = function(baseName, methodNames) {
@@ -5264,6 +5280,22 @@ getJasmineRequireObj().SpyStrategy = function(j$) {
     this.originalFn = options.fn || function() {};
     this.getSpy = options.getSpy || function() {};
     this.plan = this._defaultPlan = function() {};
+
+    var k, cs = options.customStrategies || {};
+    for (k in cs) {
+      if (j$.util.has(cs, k) && !this[k]) {
+        this[k] = function() {
+          var plan = cs[k].apply(null, arguments);
+
+          if (!j$.isFunction_(plan)) {
+            throw new Error('Spy strategy must return a function');
+          }
+
+          this.plan = plan;
+          return this.getSpy();
+        };
+      }
+    }
   }
 
   /**