code: package co.infinum.goldfinger;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.mockito.Mock;
  import org.mockito.junit.MockitoJUnitRunner;
  
  import androidx.biometric.BiometricManager;
  import androidx.fragment.app.FragmentActivity;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  @RunWith(MockitoJUnitRunner.class)
  public class ValidateUtilsTest {
  
      private static final String TITLE = "Title";
      private static final String SUBTITLE = "Subtitle";
      private static final String DESCRIPTION = "Description";
      private static final String NEGATIVE_BUTTON_TEXT = "Cancel";
      private static final String KEY = "Key";
      private static final String VALUE = "Value";
  
      @Mock
      FragmentActivity activity;
  
      @Test
      public void auth_invalid_emptyTitle() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .description(DESCRIPTION)
              .negativeButtonText(NEGATIVE_BUTTON_TEXT)
              .subtitle(SUBTITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.BIOMETRIC_WEAK)
              .confirmationRequired(true)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).size());
      }
  
      @Test
      public void auth_invalid_negativeButtonSet() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .description(DESCRIPTION)
              .title(TITLE)
              .negativeButtonText(NEGATIVE_BUTTON_TEXT)
              .subtitle(SUBTITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.BIOMETRIC_WEAK | BiometricManager.Authenticators.DEVICE_CREDENTIAL)
              .confirmationRequired(true)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).size());
      }
  
      @Test
      public void auth_invalid_negativeButtonRequired() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .description(DESCRIPTION)
              .title(TITLE)
              .subtitle(SUBTITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.BIOMETRIC_WEAK)
              .confirmationRequired(true)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).size());
      }
  
      @Test
      public void auth_invalid_negativeTextRequired() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).size());
      }
  
      @Test
      public void auth_valid() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .description(DESCRIPTION)
              .subtitle(SUBTITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.BIOMETRIC_WEAK | BiometricManager.Authenticators.DEVICE_CREDENTIAL)
              .confirmationRequired(true)
              .build();
          assertTrue(ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).isEmpty());
      }
  
      @Test
      public void auth_valid_missingOptionalParams() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .negativeButtonText(NEGATIVE_BUTTON_TEXT)
              .build();
          assertTrue(ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).isEmpty());
      }
  
      @Test
      public void auth_valid_negativeTextIgnoredIfDeviceCredentialsTrue() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.DEVICE_CREDENTIAL)
              .build();
          assertTrue(ValidateUtils.validatePromptParams(Mode.AUTHENTICATION, params).isEmpty());
      }
  
      @Test
      public void decrypt_invalid_emptyKey() {
          assertEquals(1, ValidateUtils.validateCipherParams(Mode.DECRYPTION, "", VALUE).size());
      }
  
      @Test
      public void decrypt_invalid_emptyValue() {
          assertEquals(1, ValidateUtils.validateCipherParams(Mode.DECRYPTION, KEY, "").size());
      }
  
      @Test
      public void decrypt_invalid_withDeviceCredentialsTrue() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.DEVICE_CREDENTIAL)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.DECRYPTION, params).size());
      }
  
      @Test
      public void decrypt_valid() {
          assertTrue(ValidateUtils.validateCipherParams(Mode.DECRYPTION, KEY, VALUE).isEmpty());
      }
  
      @Test
      public void encrypt_invalid_emptyKey() {
          assertEquals(1, ValidateUtils.validateCipherParams(Mode.ENCRYPTION, "", VALUE).size());
      }
  
      @Test
      public void encrypt_invalid_emptyValue() {
          assertEquals(1, ValidateUtils.validateCipherParams(Mode.ENCRYPTION, KEY, "").size());
      }
  
      @Test
      public void encrypt_invalid_withDeviceCredentialsTrue() {
          Goldfinger.PromptParams params = new Goldfinger.PromptParams.Builder(activity)
              .title(TITLE)
              .allowedAuthenticators(BiometricManager.Authenticators.DEVICE_CREDENTIAL)
              .build();
          assertEquals(1, ValidateUtils.validatePromptParams(Mode.ENCRYPTION, params).size());
      }
  
      @Test
      public void encrypt_valid() {
          assertTrue(ValidateUtils.validateCipherParams(Mode.ENCRYPTION, KEY, VALUE).isEmpty());
      }
  }