Can't see run test icons in gutter

I have upgrade to the 2017.3 EAP and was looking forward to the XCTest gutter icon enhancements. However, I'm not seeing them when I have a test class open in the editor.

I check the preferences and don't see anything obvious for this. I do see a "run line marker" in the Gutter Icons settings. Is this the one? I've tried disabling it and re-enabling to no avail.

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