speed up energy tests; test more spaces

4 jobs for NIFTy_4 in 2 minutes and 26 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build Docker
passed #566420
build_docker_from_cache

00:00:16

 
  Test
passed #566421
test_python2_with_coverage

00:02:10

81.0%
failed #566422
test_python3

00:00:13

 
  Release
skipped #566423
pages
 
Name Stage Failure
failed
test_python3 Test
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