Prior to this commit, if multiple, directly present
`@TestPropertySource` annotations declared the same property, the
precedence ordering was top-down instead of bottom-up, in contrast to
the semantics for class hierarchies. In other words, a subsequent
`@TestPropertySource` annotation could not override a property in a
previous `@TestPropertySource` annotation.
This commit overhauls the internals of `TestPropertySourceUtils` in
order to provide proper support for property overrides within local,
directly present `@TestPropertySource` declarations.
Specifically, the `locations` and `properties` attributes from all
`@TestPropertySource` declarations that are directly present or
meta-present on a given class are now merged into a single instance of
`TestPropertySourceAttributes` internally, with assertions in place to
ensure that such "same level" `@TestPropertySource` declarations do not
configure different values for the `inheritLocations` and
`inheritProperties` flags. Effectively, all "same level"
`@TestPropertySource` declarations are treated internally as if there
were only one such annotation declared by the user.
See gh-23320
136af0b164