* test/manual/image-circular-tests.el
(image-test-duplicate-keywords): Skip unless images are supported.
(image-test-circular-plist, image-test-:type-property-value): Ditto.
Wrap only failing forms in should[-error] rather than entire test
bodies. Use simpler printed notation in place of function calls.
(image-test-circular-specs): Ditto. Wrap overly wide docstring.
Mark as failing since shortly after its introduction (bug#36403#63).
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