Is there a Hamcrest matcher to check that a Collection is neither empty nor empty?

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Is there a Hamcrest matcher to check that the parameter is neither an empty Collection nor null?

i think i can use forever

both(notNullValue()).and(not(hasSize(0))

But I'm wondering if there is an easier way, so I'm missing it.

eee：

You can combine and matchers:IsCollectionWithSizeOrderingComparison

@Test
public void test() throws Exception {
    Collection<String> collection = ...;
    assertThat(collection, hasSize(greaterThan(0)));
}

  • to collection = nullyou

    java.lang.AssertionError: 
Expected: a collection with size a value greater than <0>
    but: was null

  • to collection = Collections.emptyList()you

    java.lang.AssertionError: 
Expected: a collection with size a value greater than <0>
    but: collection size <0> was equal to <0>
  • For the collection = Collections.singletonList("Hello world")test to pass.

edit:

Just note that the following calculation strategy is not working:

assertThat(collection, is(not(empty())));

If you want to explicitly test for null, the more I think about it, I recommend a slightly altered version of the statement the OP wrote.

assertThat(collection, both(not(empty())).and(notNullValue()));

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