test: improve utils coverage (#4230)

* test: improve utils coverage

* refactor: review - rename isDefined to isNonNullable, update tests and return statement

packages/twenty-front/src/utils/array/moveArrayItem.ts

@@ -1,5 +1,19 @@
-export const moveArrayItem = <Item>(
-  array: Item[],
+/**
+ * Moves an item in an array from one index to another.
+ *
+ * @param array - The array to move an item in.
+ * @param indices - The indices to move the item from and to.
+ * @param indices.fromIndex - The index to move the item from.
+ * @param indices.toIndex - The index to move the item to.
+ *
+ * @returns A new array with the item moved to the new index.
+ *
+ * @example
+ * moveArrayItem(['a', 'b', 'c'], { fromIndex: 0, toIndex: 2 })
+ * => ['b', 'c', 'a']
+ */
+export const moveArrayItem = <ArrayItem>(
+  array: ArrayItem[],
   { fromIndex, toIndex }: { fromIndex: number; toIndex: number },
 ) => {
   if (!(fromIndex in array) || !(toIndex in array) || fromIndex === toIndex) {