A comparator compares data and reports the differences. The latter must then be analysed manually to determine whether the
differences coincide with expectations. These tools are used to e.g.
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Compare test output against the test output of the previous test
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Compare a data collection before and after one or more test actions
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Compare the results of shadow production against the results of production.
Such tools are often an integrated part of record & playback tools. As an alternative, the simple file compare
functionality or the revision functionality of a word processor can be used.
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