@Test
void loadSingle() throws IOException {

    PrivateKeyLoader loader = new PrivateKeyLoader();
    createPrivateKeys(new Object[]{"key1", testPrivateKeyContent});
    Object certContent = loader.loadSingle("key1", new File(new File(config, "privateKeys"), "key1.p12"));
    assertNotNull(certContent);
    assertTrue(certContent instanceof String);
    assertTrue(Base64.isBase64(certContent.toString()));
}