MyViewModelTests.cs

    public class MyViewModelTests
    {
        private readonly MyViewModel _myViewModel = new MyViewModel();

        [Theory]
        [InlineData("111.111.111-11", true)]
        [InlineData("111111.111-11", false)]
        [InlineData("111.111111-11", false)]
        [InlineData("111.111.11111", false)]
        [InlineData("11111111111", false)]
        [InlineData("qioweoi1nadslk", false)]
        public void IsValidCPF_ShouldValidateStringMask(string input, bool expectedValue)
        {
            var result = _myViewModel.IsValidCPF(input);

            Assert.Equal(expectedValue, result);
        }
    }