Introduce ResultActions.andExpectAll() for soft assertions in MockMvc

Closes gh-26917

src/docs/asciidoc/testing.adoc

@@ -7219,8 +7219,9 @@ they must be specified on every request.
 [[spring-mvc-test-server-defining-expectations]]
 ===== Defining Expectations
 
-You can define expectations by appending one or more `.andExpect(..)` calls after
-performing a request, as the following example shows:
+You can define expectations by appending one or more `andExpect(..)` calls after
+performing a request, as the following example shows. As soon as one expectation fails,
+no other expectations will be asserted.
 
 [source,java,indent=0,subs="verbatim,quotes",role="primary"]
 .Java
@@ -7240,6 +7241,21 @@ performing a request, as the following example shows:
 	}
 ----
 
+You can define multiple expectations by appending `andExpectAll(..)` after performing a
+request, as the following example shows. In contrast to `andExpect(..)`,
+`andExpectAll(..)` guarantees that all supplied expectations will be asserted and that
+all failures will be tracked and reported.
+
+[source,java,indent=0,subs="verbatim,quotes",role="primary"]
+.Java
+----
+	// static import of MockMvcRequestBuilders.* and MockMvcResultMatchers.*
+
+	mockMvc.perform(get("/accounts/1")).andExpectAll(
+		status().isOk(),
+		content().contentType("application/json;charset=UTF-8"));
+----
+
 `MockMvcResultMatchers.*` provides a number of expectations, some of which are further
 nested with more detailed expectations.