Add simple test

Codeforces.Test/Tests.cs

@@ -4,6 +4,37 @@ namespace Codeforces.Test;
 
 public class Tests
 {
+	[Fact]
+	public void TestText()
+	{
+		IOTester.Start();
+		string[] input = new[]
+		{
+			"5",
+			"256 42",
+			"1000 1000",
+			"-1000 1000",
+			"-1000 1000",
+			"20 22"
+		};
+
+		IOTester.SetInput(input);
+		Program.Main();
+		string[] expectedOutput = new[]
+		{
+			"298",
+			"2000",
+			"0",
+			"0",
+			"42"
+		};
+		string[] actualOutput = IOTester.GetOutputLines();
+		Assert.Equal(expectedOutput.Length, actualOutput.Length);
+		for (int i = 0; i < expectedOutput.Length; i++)
+		{
+			Assert.Equal(expectedOutput[i], actualOutput[i]);
+		}
+	}
 
 	[Theory]
 	[ClassData(typeof(FileNameGenerator))]
@@ -28,12 +59,12 @@ public class FileNameGenerator : IEnumerable<object[]>
 {
 	private readonly string inputFolder = @"..\..\..\Input";
 	public IEnumerator<object[]> GetEnumerator()
-	{		
+	{
 		foreach (var input in Directory.GetFiles(inputFolder))
 		{
 			string name = Path.GetFileName(input);
 			string output = $"..\\..\\..\\Output\\{name}.a";
-			yield return new object[] {input, output};
+			yield return new object[] { input, output };
 		}
 	}