diff --git a/test/spec/TestHelper.js b/test/spec/TestHelper.js
new file mode 100644
index 00000000..0435c694
--- /dev/null
+++ b/test/spec/TestHelper.js
@@ -0,0 +1,112 @@
+'use strict';
+
+var _ = require('lodash');
+var BpmnJS = require('../../');
+
+var OPTIONS, BPMN_JS;
+
+function options(opts) {
+  if (_.isFunction(opts)) {
+    opts = opts();
+  }
+
+  OPTIONS = opts;
+}
+
+/**
+ * Bootstrap BpmnJS given the specified options and a number of locals (i.e. services)
+ *
+ * @example
+ *
+ * describe(function() {
+ *
+ *   var mockEvents;
+ *
+ *   beforeEach(bootstrapBpmnJS(function() {
+ *     mockEvents = new Events();
+ *
+ *     return {
+ *       events: mockEvents
+ *     };
+ *   }));
+ *
+ * });
+ *
+ * @param  {Object} (options) optional options to be passed to the diagram upon instantiation
+ * @param  {Object|Function} locals  the local overrides to be used by the diagram or a function that produces them
+ * @return {Function}         a function to be passed to beforeEach
+ */
+function bootstrapBpmnJS(diagram, options, locals) {
+
+  return function(done) {
+
+    var _diagram = diagram,
+        _options = options,
+        _locals = locals;
+
+    if (!_locals && _.isFunction(_options)) {
+      _locals = _options;
+      _options = null;
+    }
+
+    if (_.isFunction(_options)) {
+      _options = _options();
+    }
+
+    if (_.isFunction(_locals)) {
+      _locals = _locals();
+    }
+
+    _options = _.extend({}, OPTIONS || {}, _options || {});
+
+    var mockModule = {};
+
+    _.forEach(_locals, function(v, k) {
+      mockModule[k] = ['value', v];
+    });
+
+    _options.modules = _.unique([].concat(_options.modules || [], [ mockModule ]));
+
+    BPMN_JS = new BpmnJS(_options);
+
+    // import diagram
+    BPMN_JS.importXML(_diagram, done);
+  };
+}
+
+/**
+ * Injects services of an instantiated diagram into the argument.
+ *
+ * Use it in conjunction with {@link #bootstrapBpmnJS}.
+ *
+ * @example
+ *
+ * describe(function() {
+ *
+ *   var mockEvents;
+ *
+ *   beforeEach(bootstrapBpmnJS(...));
+ *
+ *   it('should provide mocked events', inject(function(events) {
+ *     expect(events).toBe(mockEvents);
+ *   }));
+ *
+ * });
+ *
+ * @param  {Function} fn the function to inject to
+ * @return {Function} a function that can be passed to it to carry out the injection
+ */
+function inject(fn) {
+  return function() {
+
+    if (!BPMN_JS) {
+      throw new Error('no bootstraped bpmn-js instance, ensure you created it via #bootstrapBpmnJS');
+    }
+
+    BPMN_JS.invoke(fn);
+  };
+}
+
+
+module.exports.bootstrapBpmnJS = (window || global).bootstrapBpmnJS = bootstrapBpmnJS;
+module.exports.inject = (window || global).inject = inject;
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diff --git a/test/spec/browser/environment/MockingSpec.js b/test/spec/browser/environment/MockingSpec.js
new file mode 100644
index 00000000..088df79f
--- /dev/null
+++ b/test/spec/browser/environment/MockingSpec.js
@@ -0,0 +1,51 @@
+'use strict';
+
+var TestHelper = require('../../TestHelper');
+
+/* global bootstrapBpmnJS, inject */
+
+var fs = require('fs');
+
+var Events = require('diagram-js/lib/core/EventBus');
+
+
+describe('environment/Mocking', function() {
+
+  var diagramXML = fs.readFileSync('test/fixtures/bpmn/simple.bpmn', 'utf8');
+
+  var mockEvents, bootstrapCalled;
+
+  beforeEach(bootstrapBpmnJS(diagramXML, function() {
+    mockEvents = new Events();
+
+    bootstrapCalled = true;
+
+    return {
+      eventBus: mockEvents
+    };
+  }));
+
+  afterEach(function() {
+    bootstrapCalled = false;
+  });
+
+
+  it('should use spy', inject(function(eventBus) {
+
+    expect(eventBus).toEqual(mockEvents);
+    expect(bootstrapCalled).toBe(true);
+  }));
+
+
+  it('should reparse bootstrap code', inject(function(eventBus) {
+
+    expect(bootstrapCalled).toBe(true);
+  }));
+
+
+  it('should inject bpmnjs', inject(function(bpmnjs) {
+
+    expect(bpmnjs).toBeDefined();
+  }));
+
+});
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