rust-sql-test

Testing & Quality

Enforces unit test requirements for the Rust data-processing modules in src-tauri/src/sql/ (generator.rs, parse.rs) and src-tauri/src/reader/ (excel.rs and other readers). Use when writing, editing, or reviewing Rust code in these modules. Ensures stability tests (and performance tests for hot-path code) are added for any change, and that tests follow the shared `<module>_test.rs` convention.

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Rust Data Module: Unit Test Requirements

Rule

Any change to code under src-tauri/src/sql/ or src-tauri/src/reader/ MUST be accompanied by corresponding unit tests.

This applies to:

New functions or structs
Modified logic in existing functions
Performance optimizations (require performance tests)
Bug fixes (require regression tests)

Test Structure

Tests live in separate <module>_test.rs files within the same module directory (one test file per implementation file). Do NOT place #[cfg(test)] mod tests blocks inline inside the implementation file.

src-tauri/src/sql/
├── generator.rs          # implementation
├── generator_test.rs     # tests for generator
├── parse.rs              # implementation
├── parse_test.rs         # tests for parse (if needed)
└── mod.rs                # registers test modules with #[cfg(test)]

src-tauri/src/reader/
├── excel.rs              # implementation
├── excel_test.rs         # tests for excel
└── mod.rs                # registers test modules with #[cfg(test)]

pub mod excel;

#[cfg(test)]
mod excel_test;

Each test file imports the items under test from its sibling module:

use super::excel::{excel_cell_to_timestamp_nanos, infer_cell_data_type};

Two Test Categories Required

1. Stability Tests

Every public or pub(crate) function must have stability tests covering:

Aspect	What to test
Correctness	Expected output for valid inputs
Edge cases	Empty strings, NULL, large values, negative numbers
Error handling	Invalid inputs return appropriate errors
Type safety	Each `SqlType` variant produces correct SQL output
Regression	Previously fixed bugs stay fixed

Naming convention: test_<function>_<scenario>()

Examples:

test_format_bool_for_sql_known_values()
test_resolve_export_specs_rejects_duplicate_export_names()
test_format_cell_bool_to_int()
test_converts_excel_datetime_cell()
test_non_datetime_cells_return_none()

2. Performance Tests

Any code in the hot formatting loop or called per-row must have performance tests:

Aspect	What to test
Time bound	Completes within a reasonable time for N iterations
Scaling	Does not degrade unexpectedly with more columns/rows
Comparison	Enum dispatch is not slower than string-based approach

Naming convention: test_perf_<function>_<scenario>()

Examples:

test_perf_format_cell_for_sql_enum_dispatch()
test_perf_resolve_export_specs_large_columns()
test_perf_parse_sql_type_enum_approach()

Performance test pattern:

#[test]
fn test_perf_<name>() {
    use std::time::Instant;
    let iterations = 50_000;
    let start = Instant::now();
    for _ in 0..iterations {
        std::hint::black_box(/* call hot function */);
    }
    let duration = start.elapsed();
    assert!(
        duration.as_millis() < THRESHOLD_MS,
        "function too slow: {:?} for {} iterations",
        duration, iterations
    );
}

Exposing Internals for Testing

Functions and types needed by tests must be marked pub(crate):

// In generator.rs:
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub(crate) enum SqlType { ... }

pub(crate) fn format_cell_for_sql(...) -> String { ... }

// In excel.rs:
pub(crate) fn excel_cell_to_timestamp_nanos(cell: &Data) -> Option<i64> { ... }
pub(crate) fn infer_cell_data_type(cell: &Data) -> DataType { ... }

CI Integration

Tests run automatically in GitHub Actions via .github/workflows/test.yml on:

Push to main or ai/* branches
Pull requests targeting main

Checklist

When modifying any file under src-tauri/src/sql/ or src-tauri/src/reader/:

Added/updated stability tests in the corresponding <module>_test.rs file (not inline)
Added/updated performance tests for hot-path changes
Test module is registered in mod.rs with #[cfg(test)]
Internal items are pub(crate) if tests need access
cargo test --lib <module>::<module>_test passes locally (e.g. sql::generator_test, reader::excel_test)
No test uses unwrap() on fallible operations (use ? or assert!)