Replace splitter e2e test with unit test

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

src/hooks/common/use-bind-pointer-movement-event-on-window.ts

@@ -0,0 +1,36 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { useEffect } from 'react'
+
+/**
+ * Registers event listener for pointer movement and pointer release on the window object.
+ *
+ * @param onPointerMovement is triggered if the user moves the pointer over the window
+ * @param onPointerRelease is triggered if the pointer is released (touch end or mouse up)
+ */
+export const useBindPointerMovementEventOnWindow = (
+  onPointerMovement: (event: MouseEvent | TouchEvent) => void,
+  onPointerRelease: () => void
+) => {
+  useEffect(() => {
+    const pointerMovement = onPointerMovement
+    const pointerRelease = onPointerRelease
+    window.addEventListener('touchmove', pointerMovement)
+    window.addEventListener('mousemove', pointerMovement)
+    window.addEventListener('touchcancel', pointerRelease)
+    window.addEventListener('touchend', pointerRelease)
+    window.addEventListener('mouseup', pointerRelease)
+
+    return () => {
+      window.removeEventListener('touchmove', pointerMovement)
+      window.removeEventListener('mousemove', pointerMovement)
+      window.removeEventListener('touchcancel', pointerRelease)
+      window.removeEventListener('touchend', pointerRelease)
+      window.removeEventListener('mouseup', pointerRelease)
+    }
+  }, [onPointerMovement, onPointerRelease])
+}