tests: replaced stretchr/testify by go-openapi/testify

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.22%. Comparing base (3802129) to head (3dbed45).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #370   +/-   ##
=======================================
  Coverage   78.22%   78.22%           
=======================================
  Files          50       50           
  Lines        3371     3371           
=======================================
  Hits         2637     2637           
  Misses        624      624           
  Partials      110      110           

Flag	Coverage Δ
oldstable-macos-latest	78.22% <ø> (ø)
oldstable-ubuntu-latest	78.22% <ø> (ø)
oldstable-windows-latest	78.22% <ø> (ø)
stable-macos-latest	78.22% <ø> (ø)
stable-ubuntu-latest	78.22% <ø> (ø)
stable-windows-latest	78.22% <ø> (ø)

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