@Test
    void nestedInvocation() {
        MinifiedBouncyCastleProvider.call(() -> MinifiedBouncyCastleProvider.call(this::loadPkcs5));
    }
Tests if everything works even if Bouncy Castle is loaded already.
core/src/test/java/com/linecorp/armeria/internal/common/util/MinifiedBouncyCastleProviderTest.java