testing ground
tes·tingg·round
noun
1.
a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation
- “the new nation is a testing ground for socioeconomic theories”
- “Pakistan is a laboratory for studying the use of American troops to combat terrorism”
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Broader terms
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.