add element and mixin tests

src/__tests__/index-test.js

@@ -1,7 +1,44 @@
 jest.dontMock('../index');
 
+var React = require('react/addons');
+var TestUtils = React.addons.TestUtils;
 var ProgressHUD = require('../index');
 
 describe('ProgressHUD', function() {
+  it('should be a ReactElement', function() {
+    var is_element = TestUtils.isElement(
+      /*jshint ignore:start */
+      <ProgressHUD isVisible={false}/>
+      /*jshint ignore:end */
+    );
 
+    expect(is_element).toBe(true);
+  });
+
+  it('should not be dismissible by default', function() {
+    expect(ProgressHUD.defaultProps.isDismissible).toBe(false);
+  });
+
+  it('should default to a black spinner', function() {
+    expect(ProgressHUD.defaultProps.color).toBe('#000');
+  });
+
+  it('should default to a transparent overlay', function() {
+    expect(ProgressHUD.defaultProps.overlayColor).toBe('rgba(0, 0, 0, 0)');
+  });
+});
+
+describe('Mixin', function() {
+  it('should expose a Mixin', function() {
+    expect(ProgressHUD.Mixin).toBeTruthy();
+  });
+
+  it('should expose a showProgressHUD method', function() {
+    expect(ProgressHUD.Mixin.showProgressHUD).toBeTruthy();
+  });
+
+  it('should expose a dismissProgressHUD method', function() {
+    expect(ProgressHUD.Mixin.dismissProgressHUD).toBeTruthy();
+  });
 });
+