How to write unit test scenarios for the "push" and "return" functions in Angular using Jest?

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To write unit test scenarios for the "push" and "return" functions in Angular using Jest, follow these steps:

1. Import the relevant components and modules needed for testing, including the "push" and "return" functions.

2. Create a new test suite using the "describe" function, and provide a name and a callback function for the suite.

3. Inside the test suite, create a new test case using the "test" function, and provide a name and a callback function for the test.

4. Inside the test case, call the "push" function with a sample input value, and assert that the output value matches the expected result.

5. Repeat step 4 for the "return" function.

Here's an example of what the code might look like:

import { push, returnFn } from './my-utils';

describe('push function', () => {
  test('should add item to array', () => {
    const arr = [1, 2, 3];
    push(arr, 4);
    expect(arr).toEqual([1, 2, 3, 4]);
  });
});

describe('return function', () => {
  test('should return the input value', () => {
    const val = 'test';
    expect(returnFn(val)).toEqual(val);
  });
});

In this example, we're testing that the "push" function can add an item to an array, and that the "return" function simply returns the input value. The "toEqual" matcher is used to compare the actual output value to the expected result.