Cursor rule

1---
2description: Testing guidelines and patterns for skia-rs
3globs: ["**/*.rs", "**/tests/**"]
4alwaysApply: false
5---
6 
7# Testing Guidelines
8 
9## Unit Tests
10 
11- Place tests in the same file as the code
12- Test edge cases and error conditions
13- Use property-based testing with `proptest` for numeric code
14 
15```rust
16#[cfg(test)]
17mod tests {
18    use super::*;
19 
20    #[test]
21    fn point_addition() {
22        let p1 = Point::new(1.0, 2.0);
23        let p2 = Point::new(3.0, 4.0);
24        assert_eq!(p1 + p2, Point::new(4.0, 6.0));
25    }
26}
27```
28 
29## Property Testing
30 
31```rust
32use proptest::prelude::*;
33 
34proptest! {
35    #[test]
36    fn matrix_identity_preserves_point(x in -1000.0f32..1000.0, y in -1000.0f32..1000.0) {
37        let p = Point::new(x, y);
38        let result = Matrix::IDENTITY.map_point(p);
39        prop_assert!((result.x - p.x).abs() < 1e-6);
40        prop_assert!((result.y - p.y).abs() < 1e-6);
41    }
42}
43```
44 
45## Conformance Testing
46 
47- Compare output against Skia reference implementation
48- Use the `skia/` submodule for reference
49- Document any intentional behavioral differences
50 
51## Running Tests
52 
53```bash
54# Run all tests
55cargo test --workspace
56 
57# Run tests for a specific crate
58cargo test -p skia-rs-core
59 
60# Run with output
61cargo test --workspace -- --nocapture
62```
63