`contains` assertion fails with empty input if `actual` is not empty

While investigating #4157, I realized that [`contains`](https://www.javadoc.io/doc/org.assertj/assertj-core/latest/org.assertj.core/org/assertj/core/api/ObjectEnumerableAssert.html#contains(ELEMENT...)) and [`containsAll`](https://www.javadoc.io/doc/org.assertj/assertj-core/latest/org.assertj.core/org/assertj/core/api/ObjectEnumerableAssert.html#containsAll(java.lang.Iterable)) behave differently with an empty input:

* `contains` throws an `IllegalArgumentException`
* `containsAll` succeeds

Should `contains` also accept an empty input?

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

`contains` assertion fails with empty input if `actual` is not empty #4159

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Uh oh!

contains assertion fails with empty input if actual is not empty #4159

Description

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions

`contains` assertion fails with empty input if `actual` is not empty #4159