[ENH] Add MUSE tests

[TonyBagnall]

sets MUSE capability:univariate to False, and adds a test to improve coverage.

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$ ]. I would have added the following labels to this PR based on the changes made: [ $\color{#BCAE15}{\textsf{classification}}$ ], however some package labels are already present.

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