Added new toHaveClasses matcher; tests included

src/core/matchers/requireMatchers.js

@@ -27,6 +27,7 @@ getJasmineRequireObj().requireMatchers = function(jRequire, j$) {
       'toHaveBeenCalledTimes',
       'toHaveBeenCalledWith',
       'toHaveClass',
+      'toHaveClasses',
       'toHaveSpyInteractions',
       'toMatch',
       'toThrow',

src/core/matchers/toHaveClasses.js

@@ -0,0 +1,36 @@
+getJasmineRequireObj().toHaveClasses = function(j$) {
+  /**
+   * {@link expect} the actual value to be a DOM element that has the expected classes
+   * @function
+   * @name matchers#toHaveClasses
+   * @since 3.0.0
+   * @param {Object} expected - The class names to test for
+   * @example
+   * const el = document.createElement('div');
+   * el.className = 'foo bar baz';
+   * expect(el).toHaveClasses(['bar', 'baz']);
+   */
+  function toHaveClasses(matchersUtil) {
+    return {
+      compare: function(actual, expected) {
+        if (!isElement(actual)) {
+          throw new Error(matchersUtil.pp(actual) + ' is not a DOM element');
+        }
+
+        return {
+          pass: expected.every(e =>
+            actual.classList.value.split(' ').some(c => c === e)
+          )
+        };
+      }
+    };
+  }
+
+  function isElement(maybeEl) {
+    return (
+      maybeEl && maybeEl.classList && j$.isFunction_(maybeEl.classList.contains)
+    );
+  }
+
+  return toHaveClasses;
+};