added tests for filterSettings util

__tests__/utils/filterSettings.test.js

@@ -0,0 +1,18 @@
+import { filterSettings } from "../../src/utils/innerSliderUtils";
+
+describe("filterSettings", () => {
+  it("returns empty object if there are no valid settings", () => {
+    expect(filterSettings({})).toEqual({});
+    expect(filterSettings({ age: 10 })).toEqual({});
+  });
+  it("return an object with valid settings and omits extra properties", () => {
+    expect(filterSettings({ arrows: true, dots: true })).toEqual({
+      arrows: true,
+      dots: true
+    });
+    expect(filterSettings({ arrows: true, dots: true, age: 10 })).toEqual({
+      arrows: true,
+      dots: true
+    });
+  });
+});