[BUG] Error in nifti_image_files (pytest fixture)

[oesteban]

Summary

nifti_image_files iterates over the string name when filelist is not a list

Actual behavior

Several tests relying on this fixture fail.

Expected behavior

When only one nifti is expected, generate only one.

How to replicate the behavior

docker run -it --rm -e FSL_COURSE_DATA="/root/examples/nipype-fsl_course_data" \
                    -v ~/examples:/root/examples:ro \
                    -v ~/scratch:/scratch \
                    -w /root/src/nipype \
                    nipype/nipype_test:py35 /usr/bin/run_pytests.sh

The docker image nipype/nipype_test:py35 must be built with an up-to-date master.

Platform details:

nipype/nipype_test:py35 built on master