test: 100% test coverage of Result<TSuccess, TFailure>

Base.Tests/Structures/ResultTests.cs

@@ -0,0 +1,65 @@
+using System;
+using FruityFoundation.Base.Structures;
+using NUnit.Framework;
+
+namespace Base.Tests.Structures;
+
+public class ResultTests
+{
+	[Test]
+	public void Result_CreateSuccess_ReturnsSuccess()
+	{
+		// Arrange
+		var value = Result<int, string>.CreateSuccess(25);
+
+		// Act
+		var mergeResult = value.Merge(
+			onSuccess: _ => "onSuccess",
+			onFailure: _ => "onFailure");
+
+		// Assert
+		Assert.That(value, Is.InstanceOf<Result<int, string>>());
+		Assert.That(value.IsSuccess, Is.True);
+		Assert.That(value.IsFailure, Is.False);
+		Assert.That(value.SuccessVal, Is.EqualTo(25));
+		var failureValException = Assert.Throws<InvalidOperationException>(() => _ = value.FailureVal);
+		Assert.That(failureValException.Message, Is.EqualTo("Maybe value is empty"));
+
+		Assert.That(mergeResult, Is.EqualTo("onSuccess"));
+
+		Assert.That(value.TrySuccess(out var successVal), Is.True);
+		Assert.That(successVal, Is.EqualTo(25));
+
+		Assert.That(value.TryFailure(out var failureVal), Is.False);
+		Assert.That(failureVal, Is.Default);
+	}
+
+	[Test]
+	public void Result_CreateFailure_ReturnsFailure()
+	{
+		// Arrange
+		var value = Result<int, string>.CreateFailure("bananas aren't numbers");
+
+		// Act
+		var mergeResult = value.Merge(
+			onSuccess: _ => "onSuccess",
+			onFailure: _ => "onFailure");
+
+		// Assert
+		Assert.That(value, Is.InstanceOf<Result<int, string>>());
+		Assert.That(value.IsSuccess, Is.False);
+		Assert.That(value.IsFailure, Is.True);
+		Assert.That(value.FailureVal, Is.EqualTo("bananas aren't numbers"));
+
+		var successValException = Assert.Throws<InvalidOperationException>(() => _ = value.SuccessVal);
+		Assert.That(successValException.Message, Is.EqualTo("Maybe value is empty"));
+
+		Assert.That(mergeResult, Is.EqualTo("onFailure"));
+
+		Assert.That(value.TrySuccess(out var successVal), Is.False);
+		Assert.That(successVal, Is.Default);
+
+		Assert.That(value.TryFailure(out var failureVal), Is.True);
+		Assert.That(failureVal, Is.EqualTo("bananas aren't numbers"));
+	}
+}