If you like to run the full transformation and inspect a portion of its transformation result, apply all these 4 changes.
1. Use the latest master branch of XSpec.
2. Add @run-as="external" to /x:description. (This is a new experimental feature available only on the recent master branch.)
i.e. <x:description ... stylesheet="monolythic.xsl" run-as="external">
3. Set the context on the input document node by removing @select from x:context.
i.e. <x:context href="input.html" />
4. Inspect the <Title> in the transformation result by setting x:expect/@test.
i.e. <x:expect label="Testing 'CASEDOC' in '/'" test="/body/div[1]/Title[1]">
And then the test will succeed.
(IMHO, however, XSpec is better suited for smaller granularity tests.)