public void ShouldReturnMrName()
{
// given
string randomName = new RealNames(NameStyle.LastName).GetValue();
string inputName = randomName;
string expectedMrName = $"Mr. {randomName}";
var nameService = new NameService();
// when
string actualMrName = nameService.GetMrName(inputName);
// then
Assert.Equal(expectedMrName, actualMrName);
}