Fix PayloadMatcherTests for generics
Address PR comments and other improvements
* Revert `rawtypes` mode for the `PayloadMatcher`
* Make `HeaderMatcher` as `rawtypes` as well
* Make `MockMessageHandler` expect `rawtypes` for `Matcher`s.
This way we can just support `Matcher`s like `notNullValue(Message.class)`
* Rename `expect()` to `assertNext()`
* Rename `andReply()` to `thenReply()`
* Track replies are supplied in the `MockMessageHandler`
* Distinguish simple `MH` from the `MP` types in the
`MockIntegrationContext#instead()` do not let to replace simple `MH`
with fully configured `MockMessageHandler` or any other `MP` implementation.
Fail replace if types mismatch; wrap `MockMessageHandler` to simple `MH`
if it doesn't have replies when we are going to replace simple `MH`
* Wrap `MockMessageHandler` to the `Mockito.spy()` in the
`MockIntegration#mockMessageHandler()` to allow to `verify()` interaction
in the test-case
Remove wrapping `MockMH` to raw `MH` when no reply supported.
If `MockMH` isn't supplied with replies ti's safe to use it as is - no harm to target endpoint
which supposed to be last one in the flow
Some polishing and JavaDocs
More JavaDocs
Add docs for the `MockMessageHandler` and fix some JavaDocs
Make the `MockMessageHandler` with an API like:
```
MockIntegration.mockMessageHandler()
.handleNext(Consumer<Message<?>>)
.handleNext(Consumer<Message<?>>)
.handleNextAndReply(Function<Message<?>, Object>)
.handleNext(Consumer<Message<?>>)
.handleNextAndReply(Function<Message<?>, Object>)
.handleNextAndReply(Function<Message<?>, Object>);
```
Doc Polishing
Allow assertions of proper population in tests.
Also set Github tab size to 4.
Fix BODYSTRUCTURE metadata to match actual body (1 line, 5 octets).
Fix RFC822.SIZE to match actual message.
JIRA: https://jira.spring.io/browse/INT-4251
MockIntegration PoC
Demonstrate how `MockIntegration.mockMessageSource()` can be used.
Even from the XML Config!
The same semantics can be applied for any other our mocking features we will add to the `MockIntegration`
Add `testMockMessageSourceDynamicFlow()`
Improve `MockIntegration.Context.instead()` for target bean type assertion
Some refactoring, improvements and JavaDocs
* Move `MockIntegration.Context` to its own `MockIntegrationContext` class
* Rename `@MockIntegrationTest` to `@SpringIntegrationTest` since we talk there not only about mocks, but any other possible testing feature for integration
* Add `@SpringIntegrationTest#stopEndpoints()` attribute for endpoints bean names patterns
* Add `IntegrationEndpointsInitializer` to customize `AbstractEndpoint`s according options from the `@SpringIntegrationTest`
Right now it is only about making them `autoStartup = false`
* Rename `SI-test` to `SI-test-support`
* Rename `SI-mock` to `SI-test`
* Rename `@SpringIntegrationTest#stopEndpoints()` to `noAutoStartup()`
* Fix JavaDocs according PR comments
* Increase timeouts in some sporadically failed tests
* Draft for the `testing.adoc`
Fixesspring-projects/spring-integration-java-dsl#23
Fix `testing.adoc` a bit
* Document Testing Support
* Fix a couple typos in the `xml.adoc`
* Add `package-info.java` files to `/test/` sub-packages
Improve docs according PR comments
Fix typos in `TestUtils` JavaDocs
Add `What's New` note about Java DSL and Testing support
Doc Polishing
