Function test_codec 

pub fn test_codec<D: Codec + PartialEq + Debug>(
    encoded_bytes: &[u8],
    v: &D,
) -> Result<(), Error>

Comprehensively tests a codec implementation with both valid and corrupted data.

This function performs several checks:

1. Encodes the value and verifies it matches the expected bytes
2. Decodes the encoded bytes and verifies it matches the original value
3. Tests error handling by corrupting each byte and ensuring decode fails

Arguments

• encoded_bytes - The expected encoded representation
• v - The value to test encoding/decoding

Returns

Ok(()) if all tests pass, io::Error if any encoding/decoding operation fails