Moved toHaveClass matcher into core so that it can be used in Karma

- Fixes #1503

src/core/matchers/requireMatchers.js

@@ -21,6 +21,7 @@ getJasmineRequireObj().requireMatchers = function(jRequire, j$) {
       'toHaveBeenCalledBefore',
       'toHaveBeenCalledTimes',
       'toHaveBeenCalledWith',
+      'toHaveClass',
       'toMatch',
       'toThrow',
       'toThrowError',

src/core/matchers/toHaveClass.js

@@ -0,0 +1,33 @@
+getJasmineRequireObj().toHaveClass = function(j$) {
+  /**
+   * {@link expect} the actual value to be a DOM element that has the expected class
+   * @function
+   * @name matchers#toHaveClass
+   * @param {Object} expected - The class name to test for
+   * @example
+   * var el = document.createElement('div');
+   * el.className = 'foo bar baz';
+   * expect(el).toHaveClass('bar');
+   */
+  function toHaveClass(util, customEqualityTesters) {
+    return {
+      compare: function(actual, expected) {
+        if (!isElement(actual)) {
+          throw new Error(j$.pp(actual) + ' is not a DOM element');
+        }
+
+        return {
+          pass: actual.classList.contains(expected)
+        };
+      }
+    };
+  }
+
+  function isElement(maybeEl) {
+    return maybeEl &&
+      maybeEl.classList &&
+      j$.isFunction_(maybeEl.classList.contains);
+  }
+
+  return toHaveClass;
+};