 expected = renderedBuffer.getChannelData(0);
        const actual = renderedBuffer.getChannelData(1);
        assert_greater_than_equal(
            refOsc.frequency.value,
            context.sampleRate / 2,
            'Reference oscillator frequency should be â‰¥ Nyquist'
        );
        assert_constant_value(
            expected,
            0,
            `Reference output (freq: ${refOsc.frequency.value}) must be zero`
        );
        assert_array_equal_within_eps(
            actual,
    