Add unit tests for common/array files (#23006)

* add vitest coverage

* Add js doc to functions

* Add tests for common/array

test/common/array/combination.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it } from "vitest";
+import { getAllCombinations } from "../../../src/common/array/combinations";
+
+describe("getAllCombinations", () => {
+  it("should return all combinations of an array", () => {
+    const result = getAllCombinations([1, 2, 3]);
+    expect(result).toEqual([
+      [],
+      [1],
+      [2],
+      [1, 2],
+      [3],
+      [1, 3],
+      [2, 3],
+      [1, 2, 3],
+    ]);
+  });
+
+  it("should return an empty array for an empty input", () => {
+    const result = getAllCombinations([]);
+    expect(result).toEqual([[]]);
+  });
+
+  it("should handle an array with one element", () => {
+    const result = getAllCombinations([1]);
+    expect(result).toEqual([[], [1]]);
+  });
+
+  it("should handle an array with duplicate elements", () => {
+    const result = getAllCombinations([1, 1]);
+    expect(result).toEqual([[], [1], [1], [1, 1]]);
+  });
+});