Update tests to use Is.Zero for zero value assertions

Replaced Is.EqualTo(0) with Is.Zero in test assertions for improved readability and consistency with NUnit best practices. No functional changes to test logic.

Author: ds5678

AssetRipper.IO.Endian.Tests/EndianSpanReaderTests.cs

@@ -60,13 +60,13 @@ public void ReadBytesExactIsTheSameForBothOverloads(EndianType endianType)
 	public void ReadBytesWorksForZeroLengthReading(EndianType endianType)
 	{
 		EndianSpanReader reader = new EndianSpanReader(default, endianType);
-		Assert.That(reader.Length, Is.EqualTo(0));
+		Assert.That(reader.Length, Is.Zero);
 
-		Assert.That(reader.ReadBytes(0).Length, Is.EqualTo(0));
-		Assert.That(reader.ReadBytes(Span<byte>.Empty), Is.EqualTo(0));
-		Assert.That(reader.ReadBytesExact(0).Length, Is.EqualTo(0));
+		Assert.That(reader.ReadBytes(0).Length, Is.Zero);
+		Assert.That(reader.ReadBytes(Span<byte>.Empty), Is.Zero);
+		Assert.That(reader.ReadBytesExact(0).Length, Is.Zero);
 		reader.ReadBytes(Span<byte>.Empty);
-		Assert.That(reader.Position, Is.EqualTo(0));
+		Assert.That(reader.Position, Is.Zero);
 	}
 
 	[Theory]

AssetRipper.IO.Endian.Tests/EndianSpanTests.cs

@@ -37,8 +37,8 @@ public void PositionTest(EndianType endianType)
 		Assert.That(writer.Position, Is.EqualTo(2 * sizeof(int)));
 
 		EndianSpanReader reader = new EndianSpanReader(data, endianType);
-		Assert.That(reader.Position, Is.EqualTo(0));
-		Assert.That(reader.ReadInt32(), Is.EqualTo(0));
+		Assert.That(reader.Position, Is.Zero);
+		Assert.That(reader.ReadInt32(), Is.Zero);
 		Assert.That(reader.Position, Is.EqualTo(sizeof(int)));
 		int value2 = reader.ReadInt32();
 		Assert.That(reader.Position, Is.EqualTo(2 * sizeof(int)));