added tests for new method getSlideDirection

Author: mariano-formidable

test/specs/carousel.test.js

@@ -408,6 +408,58 @@ describe('<Carousel />', () => {
       nextButton.simulate('click');
       expect(wrapper).toHaveState({ currentSlide: 0 });
     });
+
+    describe('#getSlideDirection', () => {
+      let instance;
+
+      beforeEach(async () => {
+        const wrapper = mount(
+          <Carousel>
+            <p>Slide 1</p>
+            <p>Slide 2</p>
+            <p>Slide 3</p>
+          </Carousel>
+        );
+        instance = wrapper.instance();
+      });
+
+      it('should return zero if start and end slide are the same regardless of isWrapping', () => {
+        expect(instance.getSlideDirection(2, 2, true)).toEqual(0);
+        expect(instance.getSlideDirection(2, 2, false)).toEqual(0);
+      });
+
+      it('should return -1 if isWrapping is true and start is less than end', () => {
+        const isWrapping = true;
+        const start = 0;
+        const end = 6;
+
+        expect(instance.getSlideDirection(start, end, isWrapping)).toEqual(-1);
+      });
+
+      it('should return 1 if isWrapping is true and start is greater than end', () => {
+        const isWrapping = true;
+        const start = 6;
+        const end = 0;
+
+        expect(instance.getSlideDirection(start, end, isWrapping)).toEqual(1);
+      });
+
+      it('should return 1 if isWrapping is false and start is less than end', () => {
+        const isWrapping = false;
+        const start = 0;
+        const end = 6;
+
+        expect(instance.getSlideDirection(start, end, isWrapping)).toEqual(1);
+      });
+
+      it('should return -1 if isWrapping is false and start is greater than end', () => {
+        const isWrapping = false;
+        const start = 6;
+        const end = 0;
+
+        expect(instance.getSlideDirection(start, end, isWrapping)).toEqual(-1);
+      });
+    });
   });
 
   describe('Controls', () => {