CurrencyConverterTests.cs
1,134 bytes
| 1 | using App.BLL.Helpers; |
|---|---|
| 2 | using FluentAssertions; |
| 3 | |
| 4 | namespace App.Tests.BLL; |
| 5 | |
| 6 | public class CurrencyConverterTests |
| 7 | { |
| 8 | [Fact] |
| 9 | public void Convert_SameCurrency_ReturnsAmountUnchanged() |
| 10 | { |
| 11 | CurrencyConverter.Convert(100m, "EUR", "EUR").Should().Be(100m); |
| 12 | } |
| 13 | |
| 14 | // Parameterized matrix of conversions — each row is one independent assertion |
| 15 | [Theory] |
| 16 | [InlineData(100, "USD", "EUR", 92.0)] // 100 USD * 0.92 = 92 EUR |
| 17 | [InlineData(100, "EUR", "USD", 108.70)] // 100 EUR / 0.92 = 108.6957 → 108.70 |
| 18 | [InlineData(100, "GBP", "EUR", 116.0)] // 100 GBP * 1.16 = 116 EUR |
| 19 | public void Convert_KnownCurrencies_ReturnsCorrectExchange(decimal amount, string from, string to, decimal expected) |
| 20 | { |
| 21 | CurrencyConverter.Convert(amount, from, to).Should().Be(expected); |
| 22 | } |
| 23 | |
| 24 | [Fact] |
| 25 | public void Convert_UnknownCurrency_FallsBackToOneToOne() |
| 26 | { |
| 27 | // Defensive default: "XYZ" not in rate table → return amount as-is rather than throw |
| 28 | CurrencyConverter.Convert(100m, "XYZ", "EUR").Should().Be(100m); |
| 29 | CurrencyConverter.Convert(100m, "EUR", "XYZ").Should().Be(100m); |
| 30 | } |
| 31 | } |
| 32 | |