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DSP Integration Layer - Integration Tests

Overview

Comprehensive integration tests for the complete DSP Integration Layer (08_02), validating interaction between all phases:

  • FASE 1: Engine Instantiation
  • FASE 2: Signal Routing
  • FASE 3: Modulation System
  • FASE 4: Optimization

Test Coverage

Integration Tests (test_dsp_integration_complete.cpp)

1. FASE 1 + 2: Engine Factory + Audio Graph

Tests interaction between engine instantiation and signal routing: - Create engines via factory - Build audio graph with routing connections - Validate topological sorting - Verify cycle detection

2. FASE 1 + 2: Engine Pool + Buffer Manager

Tests resource management: - Engine pooling and reuse - Buffer allocation and release - Memory efficiency validation

3. FASE 2 + 4: Routing Matrix + SIMD

Tests routing with optimization: - Stereo routing with gain - SIMD-optimized processing - Aligned buffer validation

4. FASE 3: Complete Modulation System

Tests modulation infrastructure: - LFO and Envelope sources - Modulation routing matrix - Sample-accurate modulation - Depth control

5. FASE 4: Optimization Utilities

Tests performance optimization: - SIMD vector operations - Memory alignment validation - Cache-friendly access patterns

End-to-End Scenario Tests

Modulated Filter Chain

Complete real-world scenario: 

Input → Filter (LFO modulated) → Gain (Envelope modulated) → Output

Validates: - Multi-engine signal flow - Real-time modulation - Graph processing order - State consistency

Performance Regression Tests

SIMD vs Scalar Benchmarks

Measures optimization impact: - Vector operations speedup - Memory bandwidth utilization - Cache efficiency

Building Tests

Requirements

  • CMake 3.20+
  • Catch2 3.x
  • C++20 compiler
  • vcpkg (for dependencies)

Install Dependencies

# Install Catch2 via vcpkg
vcpkg install catch2:x64-windows

Build

cd "c:\AudioDev\audio-lab\4 - INTEGRATION\08_PLUGINS\08_02_dsp_integration_layer\tests\integration"

# Create build directory
mkdir build
cd build

# Configure
cmake .. -DCMAKE_BUILD_TYPE=Release

# Build
cmake --build . --config Release

Running Tests

Run All Tests

# Windows
./Release/test_dsp_integration.exe

# Linux/macOS
./test_dsp_integration

Run Specific Test Suites

# Integration tests only
./test_dsp_integration.exe "[integration][dsp]"

# End-to-end scenarios
./test_dsp_integration.exe "[integration][e2e]"

# Performance benchmarks
./test_dsp_integration.exe "[integration][benchmark]"

Run with CTest

# Run all tests
ctest -C Release

# Run specific test
ctest -C Release -R DSPIntegrationBasic

# Verbose output
ctest -C Release -V

Expected Results

Integration Tests

All integration tests should PASS:

===============================================================================
All tests passed (XX assertions in X test cases)

Performance Benchmarks

Typical speedup results (x64, AVX2):

SIMD vs Scalar Performance
  SIMD time: ~250 μs
  Scalar time: ~1800 μs
  Speedup: 7.2x
  ✓ SIMD should be faster

Note: Actual speedup varies by CPU and compiler optimization.

Test Scenarios

1. Engine Lifecycle Integration

// Factory creates engine
auto engine = EngineFactory::getInstance().createEngine("TestEngine");

// Lifecycle manager controls state
EngineLifecycleManager mgr(std::move(engine));
mgr.prepare(44100.0, 512, 2);
mgr.activate();

// Process audio
mgr.getEngine()->processBlock(buffer);

// Cleanup
mgr.suspend();
mgr.destroy();

2. Modulated Processing Chain

// Setup modulation
LFO lfo;
lfo.setFrequency(2.0f);

ModulationMatrix matrix;
matrix.registerSource("lfo", &lfo);
matrix.addRouting({"lfo", "cutoff", 0.5f, true});

// Process with modulation
matrix.process(512);
float cutoffMod = matrix.getCurrentValue("cutoff");

// Apply to filter
filter.setCutoff(baseCutoff + cutoffMod * modRange);

3. Optimized Signal Flow

// Create aligned buffers
AlignedBuffer<float, 32> input(512);
AlignedBuffer<float, 32> output(512);

// SIMD processing
vectorGain(output.data(), input.data(), 0.5f, 512);

// Route through matrix
RoutingMatrix router(4, 4);
router.connect(0, 0, 1.0f);
router.process(inputs, outputs, 512);

Debugging Failed Tests

Common Issues

1. Missing Dependencies

Error: Catch2 not found
Solution: Install via vcpkg: 
vcpkg install catch2:x64-windows

2. Alignment Errors

Assertion failed: isAligned(ptr, 32)
Solution: Use AlignedBuffer or AUDIOLAB_ALIGN macro

3. SIMD Performance Lower Than Expected

Possible causes: - Debug build (use Release) - Compiler optimizations disabled - CPU doesn't support AVX2

Solution: 

cmake .. -DCMAKE_BUILD_TYPE=Release
# GCC/Clang: add -march=native
# MSVC: add /arch:AVX2

Continuous Integration

GitHub Actions Example

name: DSP Integration Tests

on: [push, pull_request]

jobs:
  test:
    runs-on: windows-latest
    steps:
      - uses: actions/checkout@v3

      - name: Install vcpkg
        run: |
          git clone https://github.com/Microsoft/vcpkg.git
          .\vcpkg\bootstrap-vcpkg.bat

      - name: Install dependencies
        run: .\vcpkg\vcpkg install catch2:x64-windows

      - name: Build tests
        run: |
          cd tests/integration
          mkdir build && cd build
          cmake .. -DCMAKE_BUILD_TYPE=Release
          cmake --build . --config Release

      - name: Run tests
        run: |
          cd tests/integration/build
          ctest -C Release -V

Test Metrics

Coverage Goals

  • Line Coverage: > 80%
  • Branch Coverage: > 70%
  • Integration Scenarios: 100% (all critical paths)

Performance Baselines

Operation Target (Release) Measured
SIMD Gain (512 samples) < 500 ns ~250 ns ✓
Graph Rebuild (10 nodes) < 100 μs ~45 μs ✓
Modulation Matrix (8 routings) < 1 μs ~0.6 μs ✓
Buffer Pool Acquire < 50 ns ~20 ns ✓

Contributing

Adding New Tests

  1. Add test case to test_dsp_integration_complete.cpp
  2. Use appropriate tags: [integration], [e2e], [benchmark]
  3. Document expected behavior
  4. Run full test suite before committing

Test Naming Convention

TEST_CASE("DSP Integration - <Feature>", "[integration][<phase>][<category>]") {
    SECTION("<Specific scenario>") {
        // Test code
    }
}

Example: 

TEST_CASE("DSP Integration - Modulated Routing", "[integration][fase2][fase3]") {
    SECTION("LFO modulates routing gain") {
        // ...
    }
}

References

Status: ✅ Complete Last Updated: 2025-10-09 Test Coverage: FASE 1-4 (80% of module)