Merge [Container|Test]ExtensionContext into ExtensionContext

[sbrannen]

Overview

ConatinerExtensionContext is already just a marker interface, and with the changes being introduced in #419 the TestExtensionContext will soon contain a single Optional<Throwable> getTestException() method.

With these points in mind, now may be an opportune time to take the plunge and completely remove both the ConatinerExtensionContext and TestExtensionContext APIs and allow extension authors to rely solely on the ExtensionContext API.

Related Issues

• Allow @BeforeAll and @AfterAll methods to be non-static #419
• @TestFactory methods should evaluate ContainerExecutionCondition extensions instead of TestExecutionCondition extensions #625
• Introduce support for tracking exceptions thrown at the container level #899

Deliverables

• Move getTestException() from TestExtensionContext to ExtensionContext.
  • Potentially rename getTestException() to getExecutionException() in preparation for Introduce support for tracking exceptions thrown at the container level #899.
• Remove the ContainerExtensionContext API.
• Remove the TestExtensionContext API.
• Merge ContainerExecutionCondition and TestExecutionCondition into a single, general purpose ExecutionCondition whose method accepts a sole ExtensionContext argument.

[sbrannen]

@junit-team/junit-lambda This issue is open for team discussion within the 5.0 M5 time frame.

[sbrannen]

Thinking out loud...

One thing I find at least slightly controversial about the proposal is the merging of ContainerExecutionCondition and TestExecutionCondition.

I know that the same contextual information will available to extension authors; however, extension authors may wish to implement entirely different logic for the container level and the test level.

Perhaps it's a non-issue, but it's definitely something to keep in mind.

This of course ties into any decision made in conjunction with #625.

[sbrannen]

Added a sub-deliverable regarding getExecutionException() and #899.

[marcphilipp]

in progress