typo fixed in AbstractProcessTest (getoutput() => getOutput())
minor #11986 typo fixed in AbstractProcessTest (getoutput() => getOutput()) (YevKov)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #11986).

Discussion
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typo fixed in AbstractProcessTest (getoutput() => getOutput())

Commits
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36998bb typo fixed in AbstractProcessTest (getoutput() => getOutput())