コード例 #1
0
ファイル: Gen.java プロジェクト: travisfw/javaslang
 /**
  * Chooses a char between min and max, bounds inclusive and chars distributed according to the
  * underlying random number generator.
  *
  * <p>Note: min and max are internally swapped if min &gt; max.
  *
  * @param min lower bound
  * @param max upper bound
  * @return A new char generator
  */
 static Gen<Character> choose(char min, char max) {
   if (min == max) {
     return ignored -> min;
   } else {
     return random -> (char) (int) Gen.choose((int) min, (int) max).apply(random);
   }
 }
コード例 #2
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 @Test
 public void shouldFlatMapArbitrary() {
   final Arbitrary<Integer> arbitraryInt = size -> Gen.choose(-size, size);
   final Arbitrary<BinaryTree<Integer>> arbitraryTree =
       arbitraryInt.flatMap(i -> new ArbitraryBinaryTree(-i, i));
   assertThat(arbitraryTree.apply(0).apply(new Random())).isNotNull();
 }
コード例 #3
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 @Override
 public Gen<BinaryTree<Integer>> apply(int n) {
   return random ->
       Gen.choose(minValue, maxValue)
           .flatMap(
               value -> {
                 if (n == 0) {
                   return Gen.of(BinaryTree.leaf(value));
                 } else {
                   return Gen.frequency(
                       Tuple.of(1, Gen.of(BinaryTree.leaf(value))),
                       Tuple.of(
                           4,
                           Gen.of(
                               BinaryTree.branch(
                                   apply(n / 2).apply(random),
                                   value,
                                   apply(n / 2).apply(random)))));
                 }
               })
           .apply(random);
 }
コード例 #4
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 @Test
 public void shouldMapArbitrary() {
   final Arbitrary<Integer> arbitraryInt = size -> Gen.choose(-size, size);
   final Arbitrary<BinaryTree<Integer>> arbitraryTree = arbitraryInt.map(BinaryTree::leaf);
   assertThat(arbitraryTree.apply(0).apply(new Random())).isNotNull();
 }
コード例 #5
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 @Test
 public void shouldCreateArbitraryString() {
   final Arbitrary<String> arbitrary = Arbitrary.string(Gen.choose('a', 'z'));
   final String actual = arbitrary.apply(10).apply(new Random());
   assertThat(actual).isNotNull();
 }