Enhance test reliability
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Merge pull request #231 from dallegoet/patch-1

Update README.md
Fix #87 by not emitting progress if the duration hasn't previously been set
Check the metaData object exists
Merge pull request #232 from schaermu/fix/no-duration-progress-error

Fix #87 by not emitting progress if the duration hasn't previously been ...
1.7.1
Merge pull request #227 from njoyard/fix-tests

Improve test reliability