hamcrest array is subset of another

[Kiran Mohan]

Given that:

int[] a = {1, 2, 3, 4};
int[] b = {1, 2, 3, 4, 5};

How to asser that "a" is a subset of "b" using hamcrest matchers?

The following works

assertThat(Arrays.asList(b), hasItems(a));

But since I am creating "a" from "b", I would prefer to apply the asserts on "a" as the value. Something like

assertThat(a, isSubsetOf(b));

Additionally it is preferable to avoid converting the array to a list.

[Nat Pryce]

An isSubsetOf and isSupersetOf matcher for sets would be a good addition to the library.

As for arrays, don't worry about converting them to lists with Arrays.asList. That backs the list with the array, so there is no data copying and one small object is constructed to implement the List interface.  It may even be allocated on the stack if the JVM can work out that it doesn't escape the function.

--Nat

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