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RecursiveExamples.java
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RecursiveExamples.java
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package net.jqwik.docs;
import net.jqwik.api.*;
import net.jqwik.api.arbitraries.*;
import static net.jqwik.api.Arbitraries.*;
class RecursiveExamples {
@Property(tries = 10) @Report(Reporting.GENERATED)
boolean sentencesEndWithAPoint(@ForAll("sentences") String aSentence) {
return aSentence.endsWith(".");
}
@Provide
Arbitrary<String> sentences() {
Arbitrary<String> sentence =
Combinators.combine(lazy(this::sentences), word())
.as((s, w) -> w + " " + s);
return Arbitraries.frequencyOf(
Tuple.of(1, word().map(w -> w + ".")),
Tuple.of(3, sentence)
);
}
private StringArbitrary word() {
return Arbitraries.strings().alpha().ofLength(5);
}
@Property(tries = 10) @Report(Reporting.GENERATED)
boolean sentencesEndWithAPoint_2(@ForAll("deterministic") String aSentence) {
return aSentence.endsWith(".");
}
@Provide
Arbitrary<String> deterministic() {
Arbitrary<Integer> length = Arbitraries.integers().between(0, 10);
Arbitrary<String> lastWord = word().map(w -> w + ".");
return length.flatMap(l -> Arbitraries.recursive(() -> lastWord, this::prependWord, l));
}
private Arbitrary<String> prependWord(Arbitrary<String> sentence) {
return Combinators.combine(word(), sentence).as((w, s) -> w + " " + s);
}
}