feat: add overloads that allow to the the buffer size for the copy

src/process.tests/PipingTests.cs

@@ -64,6 +64,42 @@ internal sealed class PipingTests
 		await Assert.That(result.StandardOutput.Trim()).IsEqualTo("Hello World!");
 	}
 
+	[Test]
+	public async Task I_can_execute_a_command_and_pipe_the_stdin_from_a_stream_with_a_custom_buffer_size()
+	{
+		// Arrange
+		using var source = new MemoryStream("Hello World!"u8.ToArray());
+
+		var cmd = PipeSource.FromStream(source, 1) |
+				  new Command(Testing.Fixture.Program.FilePath)
+					  .WithArguments("echo-stdin");
+
+		// Act
+		var result = await cmd.ExecuteBufferedAsync();
+
+		// Assert
+		await Assert.That(result.StandardOutput.Trim()).IsEqualTo("Hello World!");
+	}
+
+	[Test]
+	public async Task I_can_execute_a_command_and_pipe_the_stdin_from_a_file_with_a_custom_buffer_size()
+	{
+		// Arrange
+		using var dir = TestTempDirectory.Create();
+		var filePath = Path.Combine(dir.Path, "input.txt");
+		await File.WriteAllTextAsync(filePath, "Hello World!");
+
+		var cmd = PipeSource.FromFile(filePath, 1) |
+				  new Command(Testing.Fixture.Program.FilePath)
+					  .WithArguments("echo-stdin");
+
+		// Act
+		var result = await cmd.ExecuteBufferedAsync();
+
+		// Assert
+		await Assert.That(result.StandardOutput.Trim()).IsEqualTo("Hello World!");
+	}
+
 	[Test]
 	public async Task I_can_execute_a_command_and_pipe_the_stdin_from_memory()
 	{
@@ -220,6 +256,43 @@ internal sealed class PipingTests
 		await Assert.That(stream.Length).IsEqualTo(100_000);
 	}
 
+	[Test]
+	public async Task I_can_execute_a_command_and_pipe_the_stdout_into_a_stream_with_a_custom_buffer_size()
+	{
+		// Arrange
+		using var stream = new MemoryStream();
+		var target = PipeTarget.ToStream(stream, 1);
+
+		var cmd = new Command(Testing.Fixture.Program.FilePath)
+				  .WithArguments(["generate", "blob", "--length", "100000"]) |
+				  target;
+
+		// Act
+		await cmd.ExecuteAsync();
+
+		// Assert
+		await Assert.That(stream.Length).IsEqualTo(100_000);
+	}
+
+	[Test]
+	public async Task I_can_execute_a_command_and_pipe_the_stdout_into_a_file_with_a_custom_buffer_size()
+	{
+		// Arrange
+		using var dir = TestTempDirectory.Create();
+		var filePath = Path.Combine(dir.Path, "output.bin");
+		var target = PipeTarget.ToFile(filePath, 1);
+
+		var cmd = new Command(Testing.Fixture.Program.FilePath)
+				  .WithArguments(["generate", "blob", "--length", "100000"]) |
+				  target;
+
+		// Act
+		await cmd.ExecuteAsync();
+
+		// Assert
+		await Assert.That(new FileInfo(filePath).Length).IsEqualTo(100_000);
+	}
+
 	[Test]
 	public async Task I_can_execute_a_command_and_pipe_the_stdout_into_a_string_builder()
 	{