MockRestServiceServerAutoConfiguration with RestTemplate and RestClient together throws incorrect exception #38820
Description
It should be possible to have together RestTemplate and RestClient in application and test them independently.
Unfortunately, currently if RestTemplate is used, RestClient cannot be tested:
org.springframework.boot.test.autoconfigure.web.client.MockRestServiceServerAutoConfiguration.DeferredRequestExpectationManager#getDelegate
if (!restTemplateExpectationManagers.isEmpty()) { Assert.state(restTemplateExpectationManagers.size() == 1, "Unable to use auto-configured MockRestServiceServer since " + "MockServerRestTemplateCustomizer has been bound to more than one RestTemplate"); return restTemplateExpectationManagers.values().iterator().next(); } Assert.state(restClientExpectationManagers.size() == 1, "Unable to use auto-configured MockRestServiceServer since " + "MockServerRestClientCustomizer has been bound to more than one RestClient"); return restClientExpectationManagers.values().iterator().next();