add requestAnimationFrame Mock and tests for the animator

1 files changed, 82 insertions, 0 deletions

diff --git a/spec/lib/RAFPlugin.js b/spec/lib/RAFPlugin.js
new file mode 100644
index 0000000..fefdda6
--- /dev/null
+++ b/spec/lib/RAFPlugin.js
@@ -0,0 +1,82 @@
+/**
+ * Jasmine RequestAnimationFrame: a set of helpers for testing funcionality
+ * that uses requestAnimationFrame under the Jasmine BDD framework for JavaScript.
+ */
+;(function() {
+
+    var index = 0,
+        callbacks = [];
+
+    function MockRAF(global) {
+        this.realRAF  = global.requestAnimationFrame,
+        this.realCAF  = global.cancelAnimationFrame,
+        this.realPerf = global.performance,
+        this.nextTime = 0
+
+        var _this = this
+
+        /**
+         * Mock for window.requestAnimationFrame
+         */
+        this.mockRAF = function(fn) {
+            if (typeof fn !== 'function') {
+                throw new Error('You should pass a function to requestAnimationFrame');
+            }
+
+            callbacks[index++] = fn;
+
+            return index;
+        };
+
+        /**
+         * Mock for window.cancelAnimationFrame
+         */
+        this.mockCAF = function(requestID) {
+            callbacks.splice(requestID, 1)
+        };
+
+        this.mockPerf = {
+            now: function () {
+                return _this.nextTime
+            }
+        }
+
+        /**
+         * Install request animation frame mocks.
+         */
+        this.install = function() {
+            global.requestAnimationFrame = _this.mockRAF;
+            global.cancelAnimationFrame = _this.mockCAF;
+            global.performance = _this.mockPerf;
+        };
+
+        /**
+         * Uninstall request animation frame mocks.
+         */
+        this.uninstall = function() {
+            global.requestAnimationFrame = _this.realRAF;
+            global.cancelAnimationFrame = _this.realCAF;
+            global.performance = _this.realPerf;
+        };
+
+        /**
+         * Simulate animation frame readiness.
+         */
+        this.tick = function(dt) {
+          _this.nextTime += (dt || 1)
+
+            var fns = callbacks, fn, i;
+
+            callbacks = [];
+            index = 0;
+
+            for (i in fns) {
+                fn = fns[i];
+                fn(_this.nextTime);
+            }
+        };
+    }
+
+
+    jasmine.RequestAnimationFrame = new MockRAF(window);
+}());