Adam Clarke on Judges 2:22

That through them I may prove Israel - There appeared to be no other way to induce this people to acknowledge the true God, but by permitting them to fall into straits from which they could not be delivered but by his especial providence. These words are spoken after the manner of men; and the metaphor is taken from the case of a master or father, who distrusts the fidelity or obedience of his servant or son, and places him in such circumstances that, by his good or evil conduct, he may justify his suspicions, or give him proofs of his fidelity.