Initial commit

MaybeErrorTests/ValueMaybeTests.cs

@@ -0,0 +1,108 @@
+using MaybeError;
+
+namespace MaybeErrorTests;
+
+public class ValueMaybeTests
+{
+	[Test]
+	public void HasValue()
+	{
+		ValueMaybe<int> value = 1;
+		if(value.HasValue)
+			Assert.That(value.Value, Is.EqualTo(1));
+		else
+			Assert.Fail();
+		Assert.That(value.Error, Is.Null);
+	}
+
+	[Test]
+	public void HasError()
+	{
+		ValueMaybe<int> value = new InvalidOperationException();
+		if (value.HasError)
+			Assert.That(value.Error, Is.Not.Null);
+		else
+			Assert.Fail();
+		Assert.Throws<InvalidOperationException>(() => value.Value.ToString());
+	}
+
+	[Test]
+	public void ImplicitValue()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value == 1, Is.True);
+	}
+
+	[Test]
+	public void ImplicitError()
+	{
+		ValueMaybe<int> value = new InvalidOperationException();
+		Assert.Throws<InvalidOperationException>(() => value.Value.ToString());
+	}
+
+	[Test]
+	public void ExplicitError()
+	{
+		ValueMaybe<int, ExceptionError> value = new ExceptionError(new InvalidOperationException());
+		Assert.Throws<InvalidOperationException>(() => value.Value.ToString());
+	}
+
+	[Test]
+	public void Error()
+	{
+		ValueMaybe<int> value = new Error("Test Error");
+		Assert.Throws<Exception>(() => value.Value.ToString());
+		Assert.That(value.HasError);
+		Assert.That(value.Error?.Message, Is.EqualTo("Test Error"));
+	}
+
+	[Test]
+	public void ValueOrDefault()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value.ValueOrDefault(), Is.EqualTo(1));
+
+		value = new InvalidOperationException();
+		Assert.That(value.ValueOrDefault(), Is.Null);
+	}
+
+	[Test]
+	public void ValueOrDefaultWithDefault()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value.ValueOrDefault(3), Is.EqualTo(1));
+
+		value = new InvalidOperationException();
+		Assert.That(value.ValueOrDefault(3), Is.EqualTo(3));
+	}
+
+	[Test]
+	public void As()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value.As(v => v.ToString()), Is.EqualTo("1"));
+
+		value = new InvalidOperationException();
+		Assert.Throws<InvalidOperationException>(() => value.As(v => v.ToString()));
+	}
+
+	[Test]
+	public void AsOrDefault()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value.AsOrDefault(v => v.ToString()), Is.EqualTo("1"));
+
+		value = new InvalidOperationException();
+		Assert.That(value.AsOrDefault(v => v.ToString()), Is.Null);
+	}
+
+	[Test]
+	public void AsOrDefaultWithValue()
+	{
+		ValueMaybe<int> value = 1;
+		Assert.That(value.AsOrDefault(v => v.ToString(), "err"), Is.EqualTo("1"));
+
+		value = new InvalidOperationException();
+		Assert.That(value.AsOrDefault(v => v.ToString(), "err"), Is.EqualTo("err"));
+	}
+}