add getTooltipPosition tests

src/__tests__/helpers/getTooltipPosition.test.js

@@ -0,0 +1,45 @@
+import getTooltipPosition, { getDistanceFromTop } from '../../helpers/getTooltipPosition'
+
+const props = {
+  iconSize: 24,
+  buttonMargin: 7 * 2,
+  arrowSize: 5,
+  icons: {
+    icons: {},
+    length: 2
+  }
+}
+
+window.getSelection = () => ({
+  getRangeAt: () => ({
+    getBoundingClientRect: () => ({
+      width: 75,
+      height: 21,
+      top: 218,
+      left: 720
+    })
+  })
+})
+
+describe('getDistanceFromTop', () => {
+  it('should return distance from top', () => {
+    const distance = getDistanceFromTop()
+
+    expect(distance).toEqual(0)
+  })
+})
+
+describe('getTooltipPosition', () => {
+  it('should return the tooltip position', () => {
+    const tooltipPosition = getTooltipPosition(props)
+
+    const expected = {
+      top: 175,
+      left: 719.5
+    }
+
+    expect(tooltipPosition).toEqual(expected)
+  })
+
+})
+