6857707: Add missing test case for CR 6855164 from its bug description.
Summary: Add missing test case for CR 6855164 from its bug description.
Reviewed-by: never
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# This is a very simple 'mailcap' file
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image/jpeg;; x-java-view=com.sun.activation.viewers.ImageViewer
text/*;; x-java-view=com.sun.activation.viewers.TextViewer
text/*;; x-java-edit=com.sun.activation.viewers.TextEditor