chore: Add tests to Checkbox for indeterminate and defaultChecked (#851)

* test(checkbox): Add tests for indeterminate and defaultChecked

* Update .eslintignore

remove duplicated lib

.eslintignore

@@ -1,2 +1,3 @@
-!/.storybook
+build
 lib
+!/.storybook

src/Forms/Checkbox.test.js

@@ -25,15 +25,39 @@ describe('<Checkbox />', () => {
                 onChange: () => {}
             });
 
-            expect(element.props().checked).toBe(true);
+            expect(element.find('input').props().checked).toBe(true);
+            expect(element.find('input').props()['aria-checked']).toBe('true');
+        });
+
+        test('should add checked attribute if defaultChecked is true', () => {
+            let element = setup({
+                defaultChecked: true,
+                onChange: () => {}
+            });
+
+            expect(element.find('input').props().checked).toBe(true);
+
+            // TODO: The aria-checked does not reflect the current state of the checkbox if it is uncontrolled
+            // expect(element.find('input').props()['aria-checked']).toBe('true');
+        });
+
+        test('should add aria-checked attribute of "mixed" if indeterminate is true', () => {
+            let element = setup({
+                indeterminate: true,
+                defaultChecked: true,
+                onChange: () => {}
+            });
+
+            expect(element.find('input').props().checked).toBe(true);
+            expect(element.find('input').props()['aria-checked']).toBe('mixed');
         });
 
         test('should set disabled to true when passed', () => {
             let element = setup({
                 disabled: true
             });
 
-            expect(element.props().disabled).toBe(true);
+            expect(element.find('input').props().disabled).toBe(true);
         });
 
         test('should add inline class when inline is passed', () => {