Removed 2 unnecessary stubbings in AbstractOidcTest.java and 3 unnecessary stubbings in OidcClientTest.java

[ARUS2023]

In our analysis of the project, we observed that

1. 1 unnecessary stubbings which stubbed createValidator method is created in AbstractOidcTest.createSpyOidcClient, which is invoked in OidcClientTest.newSpyOidcClient is created but never executed by 5 tests: OidcClientTest.createAuthenticationRequest, OidcClientTest.invalidAuthenticationRequestUri,OidcClientTest.tokenErrorResponse, OidcClientTest.tokenErrorResponseWithoutErrorCode, OidcClientTest.invalidTokenRequestUri; It is also created by never executed by 2 tests: IntegrationTest.redirect_browser_to_oidc_authentication_form and IntegrationTest.callback_throws_ISE_if_error_when_requesting_id_token

2. 2 unnecessary stubbings which stubbed createValidator method, getProviderMetadata method are created in AbstractOidcTest.createSpyOidcClient, which is invoked in OidcClientTest.newSpyOidcClient is created but never executed by 4 tests: OidcClientTest.getUserInfo, OidcClientTest.getAuthorizationCode,OidcClientTest.invalidAuthenticationResponseUri, OidcClientTest.authenticationErrorResponse;

3. 3 unnecessary stubbings that are created in OidcClientTest.newSpyOidcClient is created but never executed by 7 tests: OidcClientTest.createAuthenticationRequest, OidcClientTest.invalidAuthenticationRequestUri, OidcClientTest.tokenErrorResponseWithoutErrorCode, OidcClientTest.invalidTokenRequestUri, OidcClientTest.authenticationErrorResponse, OidcClientTest.invalidAuthenticationResponseUri, OidcClientTest.getAuthorizationCode;

4. 2 unnecessary stubbings which returned tokenResponse and userInfo are created in OidcClientTest.newSpyOidcClient is created but never executed by the tests: OidcClientTest.tokenErrorResponse;

5. 2 unnecessary stubbings which returned tokenResponse and errorTokenResponse are created in OidcClientTest.newSpyOidcClient is created but never executed by the tests: OidcClientTest.getUserInfo;

In summary:
There are 4 tests did not execute the stubbing which stubbed createValidator method in AbstractOidcTest.createSpyOidcClient and 3 stubbings inOidcClientTest.newSpyOidcClient. We first duplicated the method AbstractOidcTest.createSpyOidcClient, named it AbstractOidcTest.createSpyOidcClient2 and remove the unnecessary stubbings from the new method; then duplicated OidcClientTest.newSpyOidcClient, named it OidcClientTest.newSpyOidcClient2, removed the 3 unnecessary stubbings, and changed the method createSpyOidcClient to createSpyOidcClient2; At last, we applied OidcClientTest.newSpyOidcClient2 to the 4 tests.

There is 1 test did not execute the stubbing which stubbed createValidator method in AbstractOidcTest.createSpyOidcClient and 2 stubbings which returned tokenResponse and userInfo in OidcClientTest.newSpyOidcClient. We first duplicated OidcClientTest.newSpyOidcClient, named it OidcClientTest.newSpyOidcClient3, remove the 2 unnecessary stubbings, and changed the method createSpyOidcClient to createSpyOidcClient2; Then, we applied OidcClientTest.newSpyOidcClient3 to the test.

There are 1 test did not execute the 2 stubbings in AbstractOidcTest.createSpyOidcClient and 2 stubbings which returned tokenResponse and errorTokenResponse in OidcClientTest.newSpyOidcClient. We first duplicated the method AbstractOidcTest.createSpyOidcClient, named it AbstractOidcTest.createSpyOidcClient3 and remove the 2 unnecessary stubbings from the new method; then duplicated OidcClientTest.newSpyOidcClient, named it OidcClientTest.newSpyOidcClient4, removed the 2 unnecessary stubbings, and changed the method createSpyOidcClient to createSpyOidcClient3; At last, we applied OidcClientTest.newSpyOidcClient4 to the test.

There are 3 tests did not execute the 2 stubbings in AbstractOidcTest.createSpyOidcClient and and 3 stubbings inOidcClientTest.newSpyOidcClient. We first duplicated OidcClientTest.newSpyOidcClient, named it OidcClientTest.newSpyOidcClient5, removed the 2 unnecessary stubbings, and changed the method createSpyOidcClient to createSpyOidcClient3; At last, we applied OidcClientTest.newSpyOidcClient5 to the 3 tests.

Unnecessary stubbings are stubbed method calls that were never realized during test execution. Mockito recommends to remove unnecessary stubbings (https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/exceptions/misusing/UnnecessaryStubbingException.html).

We propose below a solution to remove the unnecessary stubbings.