Function testAttackTiming

tests/client_comp_test.cpp:330–362

Attack timing: envelope should reach ~63 % of step in τ ms. Drive silence → 0.5 amp step, sample GR shortly after the step.

// Attack timing: envelope should reach ~63 % of step in τ ms.
// Drive silence → 0.5 amp step, sample GR shortly after the step.
void testAttackTiming()
{
    ClientComp comp;
    comp.prepare(kSampleRate);
    comp.setEnabled(true);
    comp.setThresholdDb(-20.0f);
    comp.setRatio(10.0f);
    comp.setKneeDb(0.0f);
    comp.setMakeupDb(0.0f);
    comp.setAttackMs(20.0f);
    comp.setReleaseMs(500.0f);
    comp.setLimiterEnabled(false);
    comp.reset();

    // 20ms of silence, then loud tone burst.
    const int preFrames = static_cast<int>(kSampleRate * 0.020);
    const int burstFrames = static_cast<int>(kSampleRate * 0.200);

    std::vector<float> pre(preFrames * 2, 0.0f);
    processBlocks(comp, pre.data(), preFrames);

    auto burst = makeTone(1000.0, burstFrames, 0.5f);
    processBlocks(comp, burst.data(), burstFrames);

    // After 200ms (10× attack time constant) gain reduction should be
    // close to the steady-state value. For 0.5 amp = -6 dBFS with
    // threshold -20, ratio 10: overshoot 14 dB / ratio 10 = 1.4 dB
    // above threshold, so GR = 14 - 1.4 = 12.6 dB.
    const float gr = comp.gainReductionDb();
    report("attack reaches steady-state after 10τ",
           gr < -10.0f && gr > -14.0f,
           "GR=" + std::to_string(gr) + " dB");
}

// Soft-knee continuity: sweep the static curve and verify no discontinuity.
void testSoftKneeMonotonic()