### Question:
Credentials { public String getSignature() { return signature; } Credentials(Version version, String apiKey, String signature, String path,
                       String timestamp, String method, byte[] content); static CredentialsBuilder builder(); Version getVersion(); String getApiKey(); String getSignature(); String getPath(); String getTimestamp(); String getMethod(); byte[] getContent(); @Override boolean equals(Object obj); @Override int hashCode();  }### Answer:
@Test public void hasSignature() { assertEquals("signature", credentials.getSignature()); }