chore: import upstream snapshot with attribution

tools/challenge-helper-scripts/helpers/get-arg-value.test.ts

@@ -0,0 +1,19 @@
+import { describe, it, expect } from 'vitest';
+import { getArgValue } from './get-arg-value.js';
+
+describe('getArgValue helper', () => {
+  it('should throw if there no arguments', () => {
+    const args = ['/Path/to/node', '/Path/to/script'];
+    expect(() => getArgValue(args)).toThrow('only one argument allowed');
+  });
+
+  it('should throw if the argument is not an integer', () => {
+    expect.assertions(3);
+    const args = ['/Path/to/node', '/Path/to/script', 'num=4'];
+    expect(() => getArgValue(args)).toThrow('argument must be an integer');
+    const args2 = ['/Path/to/node', '/Path/to/script', '4.1'];
+    expect(() => getArgValue(args2)).toThrow('argument must be an integer');
+    const args3 = ['/Path/to/node', '/Path/to/script', '4'];
+    expect(getArgValue(args3)).toBe(4);
+  });
+});