Package org.assertj.core.internal

Class Iterables

java.lang.Object
org.assertj.core.internal.Iterables
public class Iterables extends Object
Reusable assertions for Iterables.
Author:
Alex Ruiz, Yvonne Wang, Maciej Jaskowski, Nicolas François, Joel Costigliola, Florent Biville

  • Constructor Details

  • Method Details

    • instance

      public static Iterables instance()
      Returns the singleton instance of this class based on StandardComparisonStrategy.
      Returns:
      the singleton instance of this class based on StandardComparisonStrategy.

    • getComparator

      public Comparator<?> getComparator()

    • getComparisonStrategy

      public ComparisonStrategy getComparisonStrategy()

    • assertNullOrEmpty

      public void assertNullOrEmpty(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable is null or empty.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is not null *and* contains one or more elements.

    • assertEmpty

      public void assertEmpty(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable is empty.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable is not empty.

    • assertNotEmpty

      public void assertNotEmpty(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable is not empty.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable is empty.

    • assertHasSize

      public void assertHasSize(AssertionInfo info, Iterable<?> actual, int expectedSize)
      Asserts that the number of elements in the given Iterable is equal to the expected one.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      expectedSize - the expected size of actual.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the number of elements in the given Iterable is different from the expected one.

    • assertHasOnlyOneElementSatisfying

      public <T> void assertHasOnlyOneElementSatisfying(AssertionInfo info, Iterable<? extends T> actual, Consumer<? super T> consumer)
      Asserts that the unique element of the Iterable satisfies the given assertions expressed as a Consumer,
      Type Parameters:
      T - the type of elements in actual.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      consumer - the given requirements.
      Throws:
      AssertionError - if the Iterable does not have a unique element.
      AssertionError - if the Iterable's unique element does not satisfies the given assertions.

    • assertHasSizeGreaterThan

      public void assertHasSizeGreaterThan(AssertionInfo info, Iterable<?> actual, int boundary)
      Asserts that the number of elements in the given Iterable is greater than the boundary.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      boundary - the given value to compare the size of actual to.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the number of elements in the given Iterable is greater than the boundary.

    • assertHasSizeGreaterThanOrEqualTo

      public void assertHasSizeGreaterThanOrEqualTo(AssertionInfo info, Iterable<?> actual, int boundary)
      Asserts that the number of elements in the given Iterable is greater than or equal to the boundary.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      boundary - the given value to compare the size of actual to.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the number of elements in the given Iterable is greater than or equal to the boundary.

    • assertHasSizeLessThan

      public void assertHasSizeLessThan(AssertionInfo info, Iterable<?> actual, int boundary)
      Asserts that the number of elements in the given Iterable is less than the boundary.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      boundary - the given value to compare the size of actual to.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the number of elements in the given Iterable is less than the expected one.

    • assertHasSizeLessThanOrEqualTo

      public void assertHasSizeLessThanOrEqualTo(AssertionInfo info, Iterable<?> actual, int boundary)
      Asserts that the number of elements in the given Iterable is less than or equal to the boundary.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      boundary - the given value to compare the size of actual to.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the number of elements in the given Iterable is less than or equal to the boundary.

    • assertHasSizeBetween

      public void assertHasSizeBetween(AssertionInfo info, Iterable<?> actual, int lowerBoundary, int higherBoundary)
      Asserts that the number of elements in the given Iterable is between the given lower and higher boundary (inclusive).
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      lowerBoundary - the lower boundary compared to which actual size should be greater than or equal to.
      higherBoundary - the higher boundary compared to which actual size should be less than or equal to.
      Throws:
      AssertionError - if the given array is null.
      AssertionError - if the number of elements in the given array is not between the boundaries.

    • assertHasSameSizeAs

      public void assertHasSameSizeAs(AssertionInfo info, Iterable<?> actual, Object other)
      Assert that the actual Iterable has the same size as the other array.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      other - the given array to compare.
      Throws:
      AssertionError - if the actual group is null.
      AssertionError - if the other group is null.
      AssertionError - if actual Iterable and other array don't have the same size.

    • assertHasSameSizeAs

      public void assertHasSameSizeAs(AssertionInfo info, Iterable<?> actual, Iterable<?> other)
      Assert that the actual Iterable has the same size as the other Iterable.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      other - the given Iterable.
      Throws:
      AssertionError - if the actual group is null.
      AssertionError - if the other group is null.
      AssertionError - if actual and other Iterable don't have the same size.

    • assertContains

      public void assertContains(AssertionInfo info, Iterable<?> actual, Object[] values)
      Asserts that the given Iterable contains the given values, in any order.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      values - the values that are expected to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain the given values.

    • assertContainsOnly

      public void assertContainsOnly(AssertionInfo info, Iterable<?> actual, Object[] expectedValues)
      Asserts that the given Iterable contains only the given values and nothing else, in any order.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      expectedValues - the values that are expected to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain the given values or if the given Iterable contains values that are not in the given array.

    • assertContainsOnlyOnce

      public void assertContainsOnlyOnce(AssertionInfo info, Iterable<?> actual, Object[] values)
      Asserts that the given Iterable contains the given values and only once.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      values - the values that are expected to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain the given values or if the given Iterable contains values that are not in the given array.

    • assertContainsOnlyNulls

      public void assertContainsOnlyNulls(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable contains only null elements and nothing else.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain at least a null element or if the given Iterable contains values that are not null elements.

    • assertContainsSequence

      public void assertContainsSequence(AssertionInfo info, Iterable<?> actual, Object[] sequence)
      Verifies that the given Iterable contains the given sequence of objects, without any other objects between them.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      sequence - the sequence of objects to look for.
      Throws:
      AssertionError - if the given Iterable is null.
      NullPointerException - if the given sequence is null.
      IllegalArgumentException - if the given sequence is empty.
      AssertionError - if the given Iterable does not contain the given sequence of objects.

    • assertDoesNotContainSequence

      public void assertDoesNotContainSequence(AssertionInfo info, Iterable<?> actual, Object[] sequence)
      Verifies that the given Iterable does not contain the given sequence of objects in order.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      sequence - the sequence of objects to look for.
      Throws:
      AssertionError - if the given Iterable is null.
      NullPointerException - if the given sequence is null.
      IllegalArgumentException - if the given sequence is empty.
      AssertionError - if the given Iterable does contain the given sequence of objects.

    • assertContainsSubsequence

      public void assertContainsSubsequence(AssertionInfo info, Iterable<?> actual, Object[] subsequence)
      Verifies that the given Iterable contains the given subsequence of objects (possibly with other values between them).
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      subsequence - the subsequence of objects to look for.
      Throws:
      AssertionError - if the given Iterable is null.
      NullPointerException - if the given sequence is null.
      IllegalArgumentException - if the given subsequence is empty.
      AssertionError - if the given Iterable does not contain the given subsequence of objects.

    • assertDoesNotContainSubsequence

      public void assertDoesNotContainSubsequence(AssertionInfo info, Iterable<?> actual, Object[] subsequence)
      Verifies that the given Iterable does not contain the given subsequence of objects (possibly with other values between them).
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      subsequence - the subsequence of objects to look for.
      Throws:
      AssertionError - if the given Iterable is null.
      NullPointerException - if the given sequence is null.
      IllegalArgumentException - if the given subsequence is empty.
      AssertionError - if the given Iterable contains the given subsequence of objects.

    • assertIsSubsetOf

      public void assertIsSubsetOf(AssertionInfo info, Iterable<?> actual, Iterable<?> values)
      Verifies that the actual Iterable is a subset of values Iterable.
      Both actual and given iterable are treated as sets, therefore duplicates on either of them are ignored.
      Parameters:
      info - contains information about the assertion.
      actual - the actual Iterable.
      values - the Iterable that should contain all actual elements.
      Throws:
      AssertionError - if the actual Iterable is null.
      NullPointerException - if the given Iterable is null.
      AssertionError - if the actual Iterable is not subset of set Iterable

    • assertDoesNotContain

      public void assertDoesNotContain(AssertionInfo info, Iterable<?> actual, Object[] values)
      Asserts that the given Iterable does not contain the given values.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      values - the values that are expected not to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable contains any of given values.

    • assertDoesNotContainAnyElementsOf

      public <T> void assertDoesNotContainAnyElementsOf(AssertionInfo info, Iterable<? extends T> actual, Iterable<? extends T> iterable)
      Asserts that the given Iterable does not contain the given values.
      Type Parameters:
      T - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      iterable - the values that are expected not to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable contains any of given values.

    • assertDoesNotHaveDuplicates

      public void assertDoesNotHaveDuplicates(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable does not have duplicate values.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable contains duplicate values.

    • assertStartsWith

      public void assertStartsWith(AssertionInfo info, Iterable<?> actual, Object[] sequence)
      Verifies that the given Iterable starts with the given sequence of objects, without any other objects between them. Similar to assertContainsSequence(AssertionInfo, Iterable, Object[]), but it also verifies that the first element in the sequence is also the first element of the given Iterable.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      sequence - the sequence of objects to look for.
      Throws:
      NullPointerException - if the given argument is null.
      IllegalArgumentException - if the given argument is an empty array.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not start with the given sequence of objects.

    • assertEndsWith

      public void assertEndsWith(AssertionInfo info, Iterable<?> actual, Object first, Object[] rest)
      Verifies that the given Iterable ends with the given sequence of objects, without any other objects between them. Similar to assertContainsSequence(AssertionInfo, Iterable, Object[]), but it also verifies that the last element in the sequence is also the last element of the given Iterable.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      first - the first element of the end sequence.
      rest - the optional next elements of the end sequence.
      Throws:
      NullPointerException - if the given argument is null.
      IllegalArgumentException - if the given argument is an empty array.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not end with the given sequence of objects.

    • assertEndsWith

      public void assertEndsWith(AssertionInfo info, Iterable<?> actual, Object[] sequence)
      Verifies that the given Iterable ends with the given sequence of objects, without any other objects between them. Similar to assertContainsSequence(AssertionInfo, Iterable, Object[]), but it also verifies that the last element in the sequence is also the last element of the given Iterable.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      sequence - the sequence of objects to look for.
      Throws:
      NullPointerException - if the given argument is null.
      IllegalArgumentException - if the given argument is an empty array.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not end with the given sequence of objects.

    • assertContainsNull

      public void assertContainsNull(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable contains at least a null element.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain at least a null element.

    • assertDoesNotContainNull

      public void assertDoesNotContainNull(AssertionInfo info, Iterable<?> actual)
      Asserts that the given Iterable does not contain null elements.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      Throws:
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable contains a null element.

    • assertAre

      public <T> void assertAre(AssertionInfo info, Iterable<? extends T> actual, Condition<? super T> condition)
      Assert that each element of given Iterable satisfies the given condition.
      Type Parameters:
      T - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to T.
      AssertionError - if one or more elements do not satisfy the given condition.

    • assertAreNot

      public <E> void assertAreNot(AssertionInfo info, Iterable<? extends E> actual, Condition<? super E> condition)
      Assert that each element of given Iterable not satisfies the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if one or more elements satisfy the given condition.

    • assertHave

      public <E> void assertHave(AssertionInfo info, Iterable<? extends E> actual, Condition<? super E> condition)
      Assert that each element of given Iterable satisfies the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if one or more elements do not satisfy the given condition.

    • assertDoNotHave

      public <E> void assertDoNotHave(AssertionInfo info, Iterable<? extends E> actual, Condition<? super E> condition)
      Assert that each element of given Iterable not satisfies the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if one or more elements satisfy the given condition.

    • assertAreAtLeast

      public <E> void assertAreAtLeast(AssertionInfo info, Iterable<? extends E> actual, int times, Condition<? super E> condition)
      Assert that there are at least n elements in the actual Iterable satisfying the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      times - the minimum number of times the condition should be verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is < n.

    • assertAreAtMost

      public <E> void assertAreAtMost(AssertionInfo info, Iterable<? extends E> actual, int n, Condition<? super E> condition)
      Assert that there are at most n elements in the actual Iterable satisfying the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      n - the number of times the condition should be at most verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is > n.

    • assertAreExactly

      public <E> void assertAreExactly(AssertionInfo info, Iterable<? extends E> actual, int times, Condition<? super E> condition)
      Verifies that there are exactly n elements in the actual Iterable satisfying the given condition.
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      times - the exact number of times the condition should be verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is ≠ n.

    • assertHaveAtLeast

      public <E> void assertHaveAtLeast(AssertionInfo info, Iterable<? extends E> actual, int times, Condition<? super E> condition)
      An alias method of assertAreAtLeast(AssertionInfo, Iterable, int, Condition) to provide a richer fluent api (same logic, only error message differs).
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      times - the minimum number of times the condition should be verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is < n.

    • assertHaveAtMost

      public <E> void assertHaveAtMost(AssertionInfo info, Iterable<? extends E> actual, int times, Condition<? super E> condition)
      An alias method of assertAreAtMost(AssertionInfo, Iterable, int, Condition) to provide a richer fluent api (same logic, only error message differs).
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      times - the number of times the condition should be at most verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is > n.

    • assertHaveExactly

      public <E> void assertHaveExactly(AssertionInfo info, Iterable<? extends E> actual, int times, Condition<? super E> condition)
      An alias method of assertAreExactly(AssertionInfo, Iterable, int, Condition) to provide a richer fluent api (same logic, only error message differs).
      Type Parameters:
      E - the type of actual elements
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      times - the exact number of times the condition should be verified.
      condition - the given Condition.
      Throws:
      NullPointerException - if the given condition is null.
      AssertionError - if an element cannot be cast to E.
      AssertionError - if the number of elements satisfying the given condition is ≠ n.

    • assertContainsAll

      public void assertContainsAll(AssertionInfo info, Iterable<?> actual, Iterable<?> other)
      Asserts that the given Iterable contains all the elements of the other Iterable, in any order.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      other - the other Iterable.
      Throws:
      NullPointerException - if Iterable is null.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain all the elements of the other Iterable, in any order.

    • assertContainsExactly

      public void assertContainsExactly(AssertionInfo info, Iterable<?> actual, Object[] values)
      Asserts that the given Iterable contains exactly the given values and nothing else, in order.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      values - the values that are expected to be in the given Iterable in order.
      Throws:
      NullPointerException - if the array of values is null.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain the given values or if the given Iterable contains values that are not in the given array, in order.

    • assertAllSatisfy

      public <E> void assertAllSatisfy(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E> requirements)

    • assertSatisfiesExactly

      public <E> void assertSatisfiesExactly(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E>[] allRequirements)

    • assertSatisfiesExactlyInAnyOrder

      public <E> void assertSatisfiesExactlyInAnyOrder(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E>[] consumers)

    • assertSatisfiesOnlyOnce

      public <E> void assertSatisfiesOnlyOnce(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E> requirements)

    • assertZipSatisfy

      public <ACTUAL_ELEMENT, OTHER_ELEMENT> void assertZipSatisfy(AssertionInfo info, Iterable<? extends ACTUAL_ELEMENT> actual, Iterable<OTHER_ELEMENT> other, BiConsumer<? super ACTUAL_ELEMENT,OTHER_ELEMENT> zipRequirements)

    • assertAnySatisfy

      public <E> void assertAnySatisfy(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E> requirements)

    • assertAllMatch

      public <E> void assertAllMatch(AssertionInfo info, Iterable<? extends E> actual, Predicate<? super E> predicate, PredicateDescription predicateDescription)

    • assertNoneSatisfy

      public <E> void assertNoneSatisfy(AssertionInfo info, Iterable<? extends E> actual, Consumer<? super E> restrictions)

    • assertAnyMatch

      public <E> void assertAnyMatch(AssertionInfo info, Iterable<? extends E> actual, Predicate<? super E> predicate, PredicateDescription predicateDescription)

    • assertNoneMatch

      public <E> void assertNoneMatch(AssertionInfo info, Iterable<? extends E> actual, Predicate<? super E> predicate, PredicateDescription predicateDescription)

    • assertContainsAnyOf

      public void assertContainsAnyOf(AssertionInfo info, Iterable<?> actual, Object[] values)
      Asserts that the given Iterable contains at least one of the given values.
      Parameters:
      info - contains information about the assertion.
      actual - the given Iterable.
      values - the values that, at least one of which is expected to be in the given Iterable.
      Throws:
      NullPointerException - if the array of values is null.
      IllegalArgumentException - if the array of values is empty and given Iterable is not empty.
      AssertionError - if the given Iterable is null.
      AssertionError - if the given Iterable does not contain any of given values.

    • assertContainsExactlyInAnyOrder

      public void assertContainsExactlyInAnyOrder(AssertionInfo info, Iterable<?> actual, Object[] values)

    • byPassingAssertions

      public static <T> Predicate<T> byPassingAssertions(Consumer<? super T> assertions)