Crate insta_fun 

insta-fun

SVG snapshot testing for FunDSP audio nodes.

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

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

Usage

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

// Simple snapshot
let node = sine_hz::<f32>(440.0);
let svg = snapshot_audio_node(node);

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

// Custom configuration
let config = SnapshotConfig::with_samples(100);
let svg = snapshot_audio_node_with_options( sine_hz::<f32>(440.0), config);

// With a macro
let node = sine_hz::<f32>(440.0);
assert_audio_node_snapshot!("docs", node);

Features

• Visualizes audio node 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
• Assertion macro

Processing Modes

• Tick: Process one sample at a time (default)
• Batch: Process up to 64 samples at once for efficiency

The Unlicense

See LICENSE file for details.

Macros

assert_audio_node_snapshot

Macro for audio node snapshot testing

Structs

SnapshotConfig

Configuration for snapshotting an audio node.

Enums

InputSource

Input provided to the audio node

Processing

Processing mode for snapshotting an audio node.

Functions

snapshot_audio_node

Create an SVG snapshot of audio node outputs

snapshot_audio_node_with_input

Create an SVG snapshot of audio node inputs and outputs

snapshot_audio_node_with_input_and_options

Create an SVG snapshot of audio node inputs and outputs, with options

snapshot_audio_node_with_options

Create an SVG snapshot of audio node outputs, with options