### Description We should have 100% code coverage of - [x] [OnBehalfOfAuthenticator.java](https://app.codecov.io/gh/opensearch-project/security/blob/main/src%2Fmain%2Fjava%2Forg%2Fopensearch%2Fsecurity%2Fhttp%2FOnBehalfOfAuthenticator.java) currently 67.65% - [x] [JwtVendor.java](https://app.codecov.io/gh/opensearch-project/security/blob/main/src%2Fmain%2Fjava%2Forg%2Fopensearch%2Fsecurity%2Fauthtoken%2Fjwt%2FJwtVendor.java) currently 75.76% ~There should be at least 80% coverage on the following:~ Covered by the integration test - [x] [CreateOnBehalfOfTokenAction.java](https://app.codecov.io/gh/opensearch-project/security/pull/3179/blob/src/main/java/org/opensearch/security/action/onbehalf/CreateOnBehalfOfTokenAction.java) currently 32.26%~ This is covered by integration tests