[chore] Adding a ton of unit tests

[blefaudeux]

Making sure the behavior is locked in place, so that it's easier for others to contribute.

Code significantly LLM generated (like 99%, still reviewing myself), kind of a first for me but I figured that was a good test case. Using Claude Code, to be transparent I gave it a shot on this task (speed up the image processing) at the time but it didn't do much good (1% speed up (: ) and I did the PR as a human :) For unit tests it seems pretty valid.

[Copilot]

Pull Request Overview

Adds a comprehensive suite of unit tests to lock in current behavior across image processing, sample pulling, struct serialization, and file enumeration, plus a minor version bump and dev‐dependency addition.

• Extensive #[cfg(test)] modules added in four source files, covering success and error paths.
• Introduced #[serde(default)] on several ImageTransformConfig fields and added precondition asserts in its constructor.
• Bumped Cargo package version and added tempfile under [dev-dependencies].

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/worker_files.rs	Added image load tests and pull_samples/async_pull_samples tests
src/structs.rs	Added constructor and serialization tests for payloads and configs
src/image_processing.rs	Added #[serde(default)], validation asserts, and image‐payload tests
src/generator_files.rs	Added tests for hash, file enumeration, and SourceFileConfig
Cargo.toml	Bumped version to 2025.6.3 and added tempfile under dev-deps

Comments suppressed due to low confidence (3)

src/image_processing.rs:31

• The image_to_rgb8 field lacks #[serde(default)], so deserializing JSON that omits it will fail, even though tests expect it to default to false. Add #[serde(default)] above this field.

pub image_to_rgb8: bool,

src/image_processing.rs:55

• [nitpick] build_image_size_list may insert duplicates when aspect ratios overlap. Consider deduplicating and/or sorting the output to ensure consistent, deterministic size lists.

img_sizes.push((img_w, img_h));

src/worker_files.rs:167

• [nitpick] This helper is duplicated in multiple test modules; consider extracting shared test utilities (e.g., image creation) into a common tests/utils.rs to reduce code duplication.

fn create_test_image(path: &std::path::Path) {

[blefaudeux]

not changing any functionality, guess is that this is good for everyone, saving time