The fix in r230473 was done to enable fixing the spacing for std::function<void( int, int )>.
I did not realized that it also fixed this issue.
Since it is fairly different from "Deleted &operator=(const Deleted &)& = default;" fixed in r230473, it seems sensible to add the regression test for it.
Also cleaned up the test by removing duplicated code and comment, and kept repeated test set consistent.
Result of running the new tests with r230473 backed out:
[ RUN ] FormatTest.ConfigurableSpacesInParentheses Actual: "std::function<void(int, int)> callback;" Expected: "std::function<void( int, int )> callback;" Actual: "std::function<void( int, int )> callback;" Expected: "std::function<void(int, int)> callback;" Actual: "std::function<void( int, int ) > callback;" Expected: "std::function<void(int, int)> callback;" [ FAILED ] FormatTest.ConfigurableSpacesInParentheses (402 ms)
Result of new tests with r230473:
[ RUN ] FormatTest.ConfigurableSpacesInParentheses
[ OK ] FormatTest.ConfigurableSpacesInParentheses (209 ms)