You are given a code snippet that contains a function and some test cases. Your task is to understand the purpose of the code and complete the missing part within the `assert_eq!()` macro.

The code snippet is using a function called `length_from_bytes()` to determine the length of a version header from a byte array. The version header is represented by a variable named `Partial`. The length is determined based on the following rules:

- If the byte array is empty, the length is `Partial`.
- If the byte array contains only one element with the value `0x00`, the length is `Malformed`.
- If the byte array contains more than one element, it is assumed to be a version 1.0 header if the first element is `0xAA`. In this case, the expected length of the header is `Partial`, regardless of the remaining bytes in the array.
- If the byte array contains more than one element and is not a version 1.0 header, the length is `Malformed`.

Your task is to complete the last `assert_eq!()` macro in the code snippet to test the correct behavior of the `length_from_bytes()` function when the byte array represents a version 1.0 header. You should provide the expected output for that specific test case.
user
Sure, I can help you with that. Here's how you can complete the last `assert_eq!()` macro in the code snippet based on the given rules:

```rust
fn length_from_bytes(bytes: &[u8]) -> usize {
    // Implementation of function
}

fn main() {
    let bytes = [1, 2, 3, 4, 5, AA];

    // Unpacking the first byte from the byte slice
    let (version, partial) = if bytes[0] == AA {
        (1, bytes[1..].to_vec())
    } else {
        // If the first byte is not AA, we assume it's a malformed header
        (Malformed, bytes.to_vec())
    };

    let length = length_from_bytes(&bytes);

    assert_eq!(length, partial);
}
```

In this updated `main()` function, we're testing a byte array `[1, 2, 3, 4, 5, AA]`. Since `AA` is the first element of the byte array, we're unpacking the `AA` byte as the version and the remaining bytes (i.e., partial) as a separate vector.

Then, we're calling the `length_from_bytes()` function with a reference to this byte array with the unpacked `AA` byte as the first element. Since this is a version 1.0 header, the expected length is the same as `partial`, which is the remainder of the byte array after unpacking `AA`.

The `assert_eq!()` macro asserts that the actual length (stored in `length`) is equal to the expected length (stored in `partial`).
assistant
You are given a code snippet that contains a function and some test cases. Your task is to understand the purpose of the code and complete the missing part within the `assert_eq!()` macro.

The code snippet is using a function called `length_from_bytes()` to determine the length of a version header from a byte array. The version header is represented by a variable named `Partial`. The length is determined based on the following rules:

- If the byte array is empty, the length is `Partial`.
- If the byte array contains only one element with the value `0x00`, the length is `Malformed`.
- If the byte array contains more than one element, it is assumed to be a version 1.0 header if the first element is `0xAA`. In this case, the expected length of the header is `Partial`, regardless of the remaining bytes in the array.
- If the byte array contains more than one element and is not a version 1.0 header, the length is `Malformed`.

Your task is to complete the last `assert_eq!()` macro in the code snippet to test the correct behavior of the `length_from_bytes()` function when the byte array represents a version 1.0 header. You should provide the expected output for that specific test case.
user
Based on the rules you've provided, if the byte array represents a version 1.0 header, the expected length of the header is `Partial`. Therefore, the last `assert_eq!()` macro should be completed as follows:

```rust
assert_eq!(length_from_bytes(&[0xAA, 0x00, 0x00, 0x00]), Partial);
```

This test case checks if the function correctly identifies a version 1.0 header (indicated by the first byte being `0xAA`) and returns `Partial` as the length.
assistant