Test callbacks in <WeedDetectorSlider/>

webpack/farmware/weed_detector/__tests__/weed_detector_slider_test.tsx

@@ -1,5 +1,8 @@
+import * as React from "react";
 import { WeedDetectorSlider } from "../slider";
+import { shallow } from "enzyme";
 
+jest.useFakeTimers();
 describe("Weed detector slider", () => {
   it("sets props", () => {
     const results = new WeedDetectorSlider({
@@ -12,4 +15,20 @@ describe("Weed detector slider", () => {
 
     expect(results.props.highest).toEqual(99);
   });
+
+  it("releases the slider", () => {
+    const onRelease = jest.fn();
+    const el = shallow(<WeedDetectorSlider
+      onRelease={onRelease}
+      highest={99}
+      lowest={1}
+      lowValue={3}
+      highValue={5} />);
+    el.simulate("release", [5, 6]);
+    jest.runAllTimers();
+    expect(onRelease).toHaveBeenCalledWith([5, 6]);
+    const { highValue, lowValue } = el.state();
+    expect(highValue).toBeUndefined();
+    expect(lowValue).toBeUndefined();
+  });
 });