public void QuandoSolicitaDiferencaEmAnosEntre31Dez2019e01Jan2019_DeveRetornarDiferencaZero()
        {
            var dataInicio = new DateTime(2019, 01, 01);
            var dataAtual  = new DateTime(2019, 12, 31);
            var diferenca  = DateTimeExtension.DiferencaEmAnos(dataInicio, dataAtual);

            Assert.AreEqual(0, diferenca);
        }
        public void QuandoSolicitaDiferencaEmAnosEntre15Mar2000e16Mar2020_DeveRetornar20Anos()
        {
            var dataInicio = new DateTime(2000, 03, 15);
            var dataAtual  = new DateTime(2020, 03, 16);
            var diferenca  = DateTimeExtension.DiferencaEmAnos(dataInicio, dataAtual);

            Assert.AreEqual(20, diferenca);
        }
        public void QuandoSolicitaDiferencaEmAnosEntre01Jan2020e01Jan2019_DeveRetornar1Ano()
        {
            var dataInicio = new DateTime(2019, 01, 01);
            var dataAtual  = new DateTime(2020, 01, 01);
            var diferenca  = DateTimeExtension.DiferencaEmAnos(dataInicio, dataAtual);

            Assert.AreEqual(1, diferenca);
        }