1 files changed, 54 insertions, 0 deletions
diff --git a/Codeforces.Test/IOTester.cs b/Codeforces.Test/IOTester.cs
new file mode 100644
index 0000000..68a0ebb
--- /dev/null
+++ b/Codeforces.Test/IOTester.cs
@@ -0,0 +1,54 @@
+namespace Codeforces.Test
+{
+    public class IOTester
+	{
+		private static readonly TextReader originalStdIn = Console.In;
+		private static StringReader? stdIn;
+
+		private static readonly TextWriter originalStdOut = Console.Out;
+		private static StringWriter? stdOut;
+
+		public static void Start()
+		{
+			stdOut = new StringWriter();
+			Console.SetOut(stdOut);
+		}
+
+		public static void End()
+		{
+			stdOut = null;
+			stdIn = null;
+			Console.SetOut(originalStdOut);
+			Console.SetIn(originalStdIn);
+		}
+
+		public static void SetInput(params string[] lines)
+		{
+			string input = string.Join(Environment.NewLine, lines);
+			stdIn = new StringReader(input);
+			Console.SetIn(stdIn);
+		}
+
+		public static string GetOutput()
+		{
+			if (stdOut == null)
+			{
+				return string.Empty;
+			}
+			else
+			{
+				return stdOut.ToString();
+			}
+		}
+
+		public static string[] GetOutputLines()
+		{
+			return GetOutput().Split(Environment.NewLine).SkipLast(1).ToArray();
+		}
+
+		public static IList<string> GetOutputLinesAsList()
+		{
+			return new List<string>(GetOutputLines());
+		}
+	}
+}
+\ No newline at end of file