Add test for immutable operations

client/src/graphql/immutable-operations.js

@@ -19,7 +19,6 @@ export const removeAtIndex = (arr, idx) => {
   ];
 };
 export const replaceAtIndex = (arr, idx, el) => {
-  console.log(idx);
  return [
    ...arr.slice(0, idx),
    el,

client/tests/unit/immutable-operations.spec.js

@@ -1,5 +1,63 @@
+import {removeAtIndex, replaceAtIndex, insertAtIndex, pushToArray } from '@/graphql/immutable-operations';
 describe('Cache operations', () => {
-  it('fails', () => {
+  it('removes at index', () => {
-   // expect(1).toEqual(2);
+    const original = [1, 2, 3];
+    const copy = removeAtIndex(original, 1);
+    expect(original.length).toBe(3);
+    expect(original).toEqual([1, 2, 3]);
+    expect(copy.length).toBe(2);
+    expect(copy).toEqual([1, 3]);
+
+    original.push(4);
+    expect(original.length).toBe(4);
+    expect(original).toEqual([1, 2, 3, 4]);
+    expect(copy.length).toBe(2);
+    expect(copy).toEqual([1, 3]);
   });
+
+  it('replaces at index', () => {
+    const original = [1, 2, 3];
+    const copy = replaceAtIndex(original, 1, 234);
+    expect(original.length).toBe(3);
+    expect(original).toEqual([1, 2, 3]);
+    expect(copy.length).toBe(3);
+    expect(copy).toEqual([1, 234, 3]);
+
+    original.push(4);
+    expect(original.length).toBe(4);
+    expect(original).toEqual([1, 2, 3, 4]);
+    expect(copy.length).toBe(3);
+    expect(copy).toEqual([1, 234, 3]);
+  });
+
+  it('inserts at index', () => {
+    const original = [1, 2, 3];
+    const copy = insertAtIndex(original, 1, 234);
+    expect(original.length).toBe(3);
+    expect(original).toEqual([1, 2, 3]);
+    expect(copy.length).toBe(4);
+    expect(copy).toEqual([1, 234, 2, 3]);
+
+    original.push(4);
+    expect(original.length).toBe(4);
+    expect(original).toEqual([1, 2, 3, 4]);
+    expect(copy.length).toBe(4);
+    expect(copy).toEqual([1, 234, 2, 3]);
+  });
+
+  it('pushed to array', () => {
+    const original = [1, 2, 3];
+    const copy = pushToArray(original, 5);
+    expect(original.length).toBe(3);
+    expect(original).toEqual([1, 2, 3]);
+    expect(copy.length).toBe(4);
+    expect(copy).toEqual([1, 2, 3, 5]);
+
+    original.push(4);
+    expect(original.length).toBe(4);
+    expect(original).toEqual([1, 2, 3, 4]);
+    expect(copy.length).toBe(4);
+    expect(copy).toEqual([1, 2, 3, 5]);
+  });
+
 });