ibaker 4a406be1bf DataSourceContractTest: Tighten assertions around 'not found' URIs
This change:
1. Updates `DataSourceContractTest` to allow multiple "not found"
   resources, and to include additional info (e.g. headers) on them.
2. Updates the contract test to assert that `DataSource.getUri()`
   returns the expected (non-null) value for "not found" resources
   between the failed `open()` call and a subsequent `close()` call.
   The `DataSource` is 'open' at this point (since it needs to be
   'closed' later), so `getUri()` must return non-null.
    * This change also fixes some implementations to comply with this
      contract. It also renames some imprecisely named `opened`
      booleans that **don't** track whether the `DataSource` is open
      or not.
3. Updates the contract test assertions to enforce that
   `DataSource.getResponseHeaders()` returns any headers associated
   with the 'not found' resource.
4. Configures `HttpDataSourceTestEnv` to provide both 404 and "server
   not found" resources, with the former having expected headers
   associated with it.

PiperOrigin-RevId: 689316121
2024-10-24 03:49:27 -07:00
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