feat: initial project commit

src/Result.Tests/ExtensionsEnumerableTests.cs

@@ -0,0 +1,54 @@
+namespace Geekeey.Extensions.Result.Tests;
+
+[TestFixture]
+internal sealed class ExtensionsEnumerableTests
+{
+	[Test]
+	public void Join_ReturnsAllSuccess_ForSequenceContainingAllSuccess()
+	{
+		IEnumerable<Result<int>> xs = [1, 2, 3, 4, 5];
+
+		var result = xs.Join();
+
+		Assert.Multiple(() =>
+		{
+			Assert.That(result.IsSuccess, Is.True);
+			Assert.That(result.Value, Is.EquivalentTo(new[] { 1, 2, 3, 4, 5 }));
+		});
+	}
+
+	[Test]
+	public void Join_ReturnsFirstFailure_ForSequenceContainingFailure()
+	{
+		IEnumerable<Result<int>> xs =
+		[
+			Success(1),
+			Success(2),
+			Failure<int>("error 1"),
+			Success(4),
+			Failure<int>("error 2")
+		];
+
+		var result = xs.Join();
+
+		Assert.Multiple(() =>
+		{
+			Assert.That(result.IsSuccess, Is.False);
+			Assert.That(result.Error?.Message, Is.EqualTo("error 1"));
+		});
+	}
+
+	[Test]
+	public void Join_ReturnsSuccess_ForEmptySequence()
+	{
+		IEnumerable<Result<int>> xs = [];
+
+		var result = xs.Join();
+
+		Assert.Multiple(() =>
+		{
+			Assert.That(result.IsSuccess, Is.True);
+			Assert.That(result.Value, Is.Empty);
+		});
+	}
+}