insta-fun

SVG snapshot testing for FunDSP audio units.

Generate visual snapshots of audio processing units to catch regressions and verify signal behavior.

Example

Note: Snapshot assertion uses insta::assert_binary_snapshot which is currently experimental.

Usage

use insta_fun::prelude::*;
use fundsp::prelude::*;

#[test]
fn example_test() {
    // Simple snapshot
    let unit = sine_hz::<f32>(440.0);
    let svg = snapshot_audio_unit(unit);

    // With input signal
    let filter = lowpass_hz(1000.0, 1.0);
    let svg = snapshot_audio_unit_with_input(filter, InputSource::impulse());

    // Custom configuration
    let config = SnapshotConfigBuilder::default().num_samples(100).build().unwrap();
    let svg = snapshot_audio_unit_with_options(sine_hz::<f32>(440.0), config);

    // With a macro
    let unit = sine_hz::<f32>(440.0);
    assert_audio_unit_snapshot!(unit);
}

Features

Visualizes audio unit inputs and outputs as SVG waveforms
Supports multi-channel audio with color-coded traces
Configurable sample count, SVG dimensions, and processing modes
Built-in input generators (impulse, sine, custom)
Batch or tick-by-tick processing
Warmup
Chart layouts with legend
Label formatting
Assertion macro

Processing Modes

Tick: Process one sample at a time (default) for testing fundsp::AudioUnit::tick
Batch: Process up to 64 samples at once for testing fundsp::AudioUnit::process

Examples

See snapshots for full list of example charts.

See tests for all usage examples.

The Unlicense