Struct TestCodeChange 

pub struct TestCodeChange {
    pub file_path: PathBuf,
    pub original_content: String,
    pub modified_content: String,
    pub change_id: String,
}

Represents a test modification to source code.

The change is designed to be:

• Minimal: Single file modification
• Detectable: Produces a different binary hash
• Reversible: Can be applied and reverted cleanly
• Deterministic: Same change always produces same result

Fields

file_path: PathBuf

Path to the file being modified.

original_content: String

Original file content before modification.

modified_content: String

Content with the test change applied.

change_id: String

Unique identifier for this change (appears in binary).

Implementations

impl TestCodeChange

pub fn for_file(file_path: &Path) -> Result<Self>

Create a test change that adds a unique marker constant.

This adds a const string to the specified file that will be compiled into the binary, allowing verification that compilation actually occurred.

Arguments

• file_path - Path to the source file to modify

Example

use std::path::Path;
use rch_common::test_change::TestCodeChange;

let change = TestCodeChange::for_file(Path::new("src/main.rs")).unwrap();
println!("Change ID: {}", change.change_id);

pub fn for_main_rs(project_dir: &Path) -> Result<Self>

Create a test change for the main.rs file in a project directory.

Arguments

• project_dir - Path to the Rust project root

pub fn for_lib_rs(project_dir: &Path) -> Result<Self>

Create a test change for lib.rs in a project directory.

Arguments

• project_dir - Path to the Rust project root

pub fn apply(&self) -> Result<()>

Apply the test change to the file.

This writes the modified content to the file path.

pub fn revert(&self) -> Result<()>

Revert the test change, restoring original content.

pub fn verify_in_binary(&self, binary_path: &Path) -> Result<bool>

Check if the compiled binary contains the test marker.

This verifies that the remote compilation actually processed our change.

Arguments

• binary_path - Path to the compiled binary

Returns

true if the marker is found in the binary

Trait Implementations

impl Clone for TestCodeChange

fn clone(&self) -> TestCodeChange

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TestCodeChange

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.