add image cases to tests

for the sake of getting the test PR (#2) over the finish line, i eliminated the image case from several of the tests. because images are a key asset in the pipelines that axoasset is used in, we should add image tests cases to these tests.

Review the tests changed for test PR #2 and identify where image cases were removed. Add representative image cases to those tests, then run the affected test suite and confirm the image cases pass through the relevant asset pipelines.

Written by the indexing model from the issue text.