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Adding documentation for common piftall that leads to exceptions #44

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8 changes: 8 additions & 0 deletions README.adoc
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
:spring_version: current
:DirtiesContext: https://docs.spring.io/spring/docs/{spring_version}/javadoc-api/org/springframework/test/annotation/DirtiesContext.html
:HttpMediaTypeNotAcceptableException: https://docs.spring.io/spring-framework/docs/{spring_version}/javadoc-api/org/springframework/web/HttpMediaTypeNotAcceptableException.html
:HttpMessageNotWritableException: https://docs.spring.io/spring-framework/docs/{spring_version}/javadoc-api/org/springframework/http/converter/HttpMessageNotWritableException.html
:toc:
:icons: font
:source-highlighter: prettify
Expand Down Expand Up @@ -172,6 +174,12 @@ include::complete/src/test/java/com/example/testingweb/TestingWebApplicationTest
----
====

NOTE: When using `@SpringBootTest` with `@AutoConfigureMockMvc` you could get some exceptions
like {HttpMediaTypeNotAcceptableException}[`HttpMediaTypeNotAcceptableException`] or
{HttpMessageNotWritableException}[`HttpMessageNotWritableException`] caused by missconfigurations,
to avoid this behavoir you should use the annotation `@AutoConfigureWebMvc`or reeplace
`@AutoConfigureMockMvc` and `@AutoConfigureWebMvc` with `@WebMvcTest` that includes both functionalities.

In this test, the full Spring application context is started but without the server. We
can narrow the tests to only the web layer by using `@WebMvcTest`, as the following
listing (from `src/test/java/com/example/testingweb/WebLayerTest.java`) shows:
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