TEST: nibabel.gifti pytest port

[anibalsolon]

No description provided.

[codecov]

Codecov Report

Merging #875 into pytest will increase coverage by 8.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           pytest     #875      +/-   ##
==========================================
+ Coverage   81.33%   89.56%   +8.23%     
==========================================
  Files          97       97              
  Lines       12408    12157     -251     
  Branches     2187     2185       -2     
==========================================
+ Hits        10092    10889     +797     
+ Misses       1900      925     -975     
+ Partials      416      343      -73

Impacted Files	Coverage Δ
nibabel/pydicom_compat.py	77.27% <0%> (-9.1%)	⬇️
nibabel/filebasedimages.py	84.61% <0%> (-1.2%)	⬇️
nibabel/dataobj_images.py	93.1% <0%> (-0.65%)	⬇️
nibabel/nicom/dicomwrappers.py	90.35% <0%> (-0.56%)	⬇️
nibabel/ecat.py	87.7% <0%> (-0.37%)	⬇️
nibabel/gifti/gifti.py	95.08% <0%> (-0.35%)	⬇️
nibabel/fileholders.py	93.1% <0%> (-0.23%)	⬇️
nibabel/minc1.py	90.41% <0%> (-0.23%)	⬇️
nibabel/loadsave.py	90.56% <0%> (-0.18%)	⬇️
nibabel/nifti2.py	94.28% <0%> (-0.16%)	⬇️
... and 47 more

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