Method buffer_isReadable_zeroSizeProvider

tests/test_provider.cpp:198–202

    }

    void buffer_isReadable_zeroSizeProvider() {
        BufferProvider p(QByteArray{});
        QVERIFY(!p.isReadable(0, 1));
        QVERIFY(p.isReadable(0, 0)); // zero-len read always ok
    }

    // ---------------------------------------------------------------
    // BufferProvider -- writing