### Question:
CertificateManager { public boolean hasNoCertificates() { return (certs == null || certs.length == 0); } CertificateManager(KeyStoreLoader loader); void setPasswordRequestListener(KeyStoreEntryPasswordRequestListener passwordRequestListener); void setKeyStoreRequestListener(KeyStoreRequestListener keyStoreRequestListener); Certificate[] getCerts(); boolean hasNoCertificates(); byte[] sign(Certificate cert, byte[] challenge); Signature extractSignature(Certificate cert); boolean verify(Certificate cert, byte[] original, byte[] signed); void load();  }### Answer:
@Test public void testHasNoCertificates() { boolean hasNoCertificates = manager.hasNoCertificates(); assertFalse(hasNoCertificates); }