### Question:
OAuth2TokenPersistence implements OAuth2Token { public String getMacExt() { return this.macExt; } OAuth2TokenPersistence(); @Inject  OAuth2TokenPersistence(final OAuth2Encrypter encrypter); @Override boolean equals(final Object obj); byte[] getEncryptedMacSecret(); byte[] getEncryptedSecret(); long getExpiresAt(); String getGadgetUri(); long getIssuedAt(); String getMacAlgorithm(); String getMacExt(); byte[] getMacSecret(); Map<String, String> getProperties(); String getScope(); byte[] getSecret(); String getServiceName(); String getTokenType(); Type getType(); String getUser(); @Override int hashCode(); void setEncryptedMacSecret(final byte[] encryptedSecret); void setEncryptedSecret(final byte[] encryptedSecret); void setExpiresAt(final long expiresAt); void setGadgetUri(final String gadgetUri); void setIssuedAt(final long issuedAt); void setMacAlgorithm(final String algorithm); void setMacExt(final String macExt); void setMacSecret(final byte[] secret); void setProperties(final Map<String, String> properties); void setScope(final String scope); void setSecret(final byte[] secret); void setServiceName(final String serviceName); void setTokenType(final String tokenType); void setType(final Type type); void setUser(final String user); @Override String toString();  }### Answer:
@Test public void testGetMacExt_1() throws Exception { final String result = OAuth2TokenPersistenceTest.accessToken.getMacExt(); Assert.assertNotNull(result); Assert.assertEquals("", result); }