### Question:
OpenIDConnectClientBuilder { public void setLoginFormAdapter(LoginFormAdapter loginFormAdapter) { if (loginFormAdapter == null) throw new IllegalArgumentException("LoginFormAdapter must not be null"); this.loginFormAdapter = loginFormAdapter; }  static OpenIDConnectClientBuilder create(); OpenIDConnectClient build(); OpenIDConnectClientBuilder setAuthorizeUrl(String authorizeUrl); OpenIDConnectClientBuilder setTokenUrl(String tokenUrl); OpenIDConnectClientBuilder setClientId(String clientId); OpenIDConnectClientBuilder setClientSecret(String clientSecret); void setLoginFormAdapter(LoginFormAdapter loginFormAdapter);  }### Answer:
@Test public void testNullloginFormAdapter() { thrown.expect(IllegalArgumentException.class); builder.setLoginFormAdapter(null); }