tests: json: add tests for arrays of objects

Add tests for the newly-added JSON_OBJ_DESCR_OBJ_ARRAY. These pass.

Note that this also adds test coverage for decoding an array of
maximum length, to avoid regressing the recently-introduced fix for
this edge case.

Signed-off-by: Marti Bolivar <marti.bolivar@linaro.org>
1 file changed