1 files changed, 120 insertions, 0 deletions
diff --git a/test/unit/specs/services/gesture_service/gesture_service.spec.js b/test/unit/specs/services/gesture_service/gesture_service.spec.js
new file mode 100644
index 00000000..4a1b009a
--- /dev/null
+++ b/test/unit/specs/services/gesture_service/gesture_service.spec.js
@@ -0,0 +1,120 @@
+import GestureService from 'src/services/gesture_service/gesture_service.js'
+
+const mockTouchEvent = (x, y) => ({
+  touches: [
+    {
+      screenX: x,
+      screenY: y
+    }
+  ]
+})
+
+describe.only('GestureService', () => {
+  describe('swipeGesture', () => {
+    it('calls the callback on a successful swipe', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
+
+      expect(swiped).to.eql(true)
+    })
+
+    it('calls the callback only once per begin', () => {
+      let hits = 0
+      const callback = () => { hits += 1 }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(200, 100), gesture)
+
+      expect(hits).to.eql(1)
+    })
+
+    it('doesn\'t call the callback on an opposite swipe', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(0, 100), gesture)
+
+      expect(swiped).to.eql(false)
+    })
+
+    it('doesn\'t call the callback on a swipe below threshold', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback,
+        100
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(150, 100), gesture)
+
+      expect(swiped).to.eql(false)
+    })
+
+    it('doesn\'t call the callback on a perpendicular swipe', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback,
+        30,
+        0.5
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(150, 200), gesture)
+
+      expect(swiped).to.eql(false)
+    })
+
+    it('calls the callback on perpendicular swipe if within tolerance', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        GestureService.DIRECTION_RIGHT,
+        callback,
+        30,
+        2.0
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(150, 150), gesture)
+
+      expect(swiped).to.eql(true)
+    })
+
+    it('works with any arbitrary 2d directions', () => {
+      let swiped = false
+      const callback = () => { swiped = true }
+      const gesture = GestureService.swipeGesture(
+        [-1, -1],
+        callback,
+        30,
+        0.1
+      )
+
+      GestureService.beginSwipe(mockTouchEvent(100, 100), gesture)
+      GestureService.updateSwipe(mockTouchEvent(60, 60), gesture)
+
+      expect(swiped).to.eql(true)
+    })
+  })
+})