docs: add RestTestClient integration testing example - #2782
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Add a RestTestClient variant alongside the existing MockMvc example in the Java integration testing guide. The RestTestClient code is taken from the CAP Java bookshop sample. Note that both approaches are equivalent with no preference, and link the Spring MockMvc and RestTestClient reference docs.
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What
Adds a
RestTestClientexample alongside the existingMockMvcexample in the Java integration testing guide (java/developing-applications/testing.md).Why
Spring Framework 7.0 introduced
RestTestClient. This documents it as an equivalent alternative for CAP Java integration tests.Details
RestTestClientcode is copied from the CAP Java bookshop sample (uses@AutoConfigureRestTestClient+@Autowired RestTestClientand the typed.value(String.class, ...)assertion).