Method buffer_readF64

tests/test_provider.cpp:130–136

    }

    void buffer_readF64() {
        QByteArray d(8, '\0');
        double val = 2.71828;
        std::memcpy(d.data(), &val, 8);
        BufferProvider p(d);
        QCOMPARE(p.readF64(0), val);
    }

    void buffer_readAs_customStruct() {
        struct Pair { uint16_t a; uint16_t b; };