Test downstream projects

Remove nose import. #1821

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Run time

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Job	Run time
jupyter_kernel_test	32s
ipywidgets	46s
jupyter_client	5m 28s
ipyparallel	5m 40s
nbclient	2m 2s
qtconsole	1m 33s
spyder_kernels	1m 38s
	17m 39s