private void testSignature_ThreadMisuse(final Signature signature, final PrivateKey key)
            throws Exception {
        final byte[] message = new byte[64];
        TestUtils.stressTestAllowingExceptions(16, 100, () -> {
            signature.initSign(key);
            signature.update(message);
            signature.sign();
        });
    }
A possible signature using SHA256withDSA of Vector2Data. Note that DSS is
randomized, so this won't be the exact signature you'll get out of
another signing operation unless you use a fixed RNG.
common/src/test/java/org/conscrypt/java/security/SignatureTest.java