assert collection does not contain item

Question

Using the hamcrest library for Java, what's a nicely readable way to do the opposite of:

assertThat(someCollection, hasItem(someItem))

I want to make sure someCollection does not contain item someItem

dee-see · Accepted Answer · 2018-02-27T14:32:25.060

153

Negate the hasItem assertion

assertThat(someCollection, not(hasItem(someItem)))

edited Feb 27 '18 at 14:32

answered Feb 20 '12 at 02:52

dee-see

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Once I imported the package IsNot (`import static org.hamcrest.core.IsNot.not`) it worked well. – harschware Feb 20 '12 at 03:32
The `Matcherzs` defines all of the. factory methods so you can have a single `*` static import. I'll look it up a work if no one else posts the line in the next hour. – David Harkness Feb 20 '12 at 17:58
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@harschware - From the [basic tutorial](http://code.google.com/p/hamcrest/wiki/Tutorial), `import static org.hamcrest.MatcherAssert.assertThat;` and `import static org.hamcrest.Matchers.*;` – David Harkness Feb 20 '12 at 18:19
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In hamcrest version 1.3- assertThat(someCollection, not(hasItem(someItem))) didn't work so I used assertThat(someCollection, not(contains(someItem))) – nik Jul 19 '21 at 12:16

score 7 · Answer 2 · edited Apr 13 '18 at 12:43

7

If you need to Assert an Array, the same logic use not(hasItemInArray())

final String[] availableIds = {"123", "321"};
final String userId = "333";

softAssert.assertThat("Id not found", availableIds, not(hasItemInArray(userId)));
softAssert.assertAll();

edited Apr 13 '18 at 12:43

Enigo

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answered Jun 06 '16 at 17:56

Sashko

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score -3 · Answer 3 · answered Mar 13 '22 at 02:15

-3

or you can do;

.extract().jsonPath().getObject("data", pojo.class);  
(above is response)

assertThat(response, not(hasItem(bodyYouArePosting)));

answered Mar 13 '22 at 02:15

Mustafa Okur

1

assert collection does not contain item

3 Answers3