jest expect add \\ in string code example

Example 1: jest expect not contain

expect('some string').toEqual(expect.not.stringContaining('something else'))

Example 2: expect any function jest

expect(something).toEqual(expect.any(Function))

Example 3: Jest toContain

# 1. Use '.toContain' when you want to check that an item is in an array.
# 2 '.toContain' can also check whether a string is a substring of another string.
test('the flavor list contains lime', () => {
  expect(['lime', 'mangle']).toContain('lime');
});

test('the flavor list contains lime', () => {
  expect("lime juice").toContain('lime');
});