How to cover JUnit block lock with NoSuchAlgorithmException and KeyStoreException

Question

I want to cover the getKeyStore () method, but I don't know how to cover the catch block for NoSuchAlgorithmException, KeyStoreException, UnrecoverableKeyException and CertificateException. My method:

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public static KeyManagerFactory getKeyStore(String keyStoreFilePath)
        throws IOException {
    KeyManagerFactory keyManagerFactory = null;
    InputStream kmf= null;
    try {
        keyManagerFactory = KeyManagerFactory.getInstance("SunX509");
        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
        keystoreStream = new FileInputStream(keyStoreFilePath);
        keyStore.load(keystoreStream, "changeit".toCharArray());
        kmf.init(keyStore, "changeit".toCharArray());
    } catch (NoSuchAlgorithmException e) {
        LOGGER.error(ERROR_MESSAGE_NO_SUCH_ALGORITHM + e);
    } catch (KeyStoreException e) {
        LOGGER.error(ERROR_MESSAGE_KEY_STORE + e);
    } catch (UnrecoverableKeyException e) {
        LOGGER.error(ERROR_MESSAGE_UNRECOVERABLEKEY + e);
    } catch (CertificateException e) {
        LOGGER.error(ERROR_MESSAGE_CERTIFICATE + e);
    } finally {
        try {
            if (keystoreStream != null){
                keystoreStream.close();
            }
        } catch (IOException e) {
            LOGGER.error(ERROR_MESSAGE_IO + e);
        }
    }
    return kmf;
}

---

How should I do it?

Answer 1

You can make fun of any block sentence tryto throw an exception that you want to catch.

KeyManagerFactory.getInstance, NoSuchAlgorithmException. catch, (KeyStoreException, UnrecoverableKeyException CertificateException).

( getInstance is static, PowerMockito Mockito, . question )

@PrepareForTest(KeyManagerFactory.class)
@RunWith(PowerMockRunner.class)
public class FooTest {

   @Test
   public void testGetKeyStore() throws Exception {
      PowerMockito.mockStatic(KeyManagerFactory.class);
      when(KeyManagerFactory.getInstance(anyString())).thenThrow(new NoSuchAlgorithmException());
   }
}

,