How to assertThat something is null with Hamcrest?

How would I assertThat something is null?

for example

 assertThat(attr.getValue(), is(""));

But I get an error saying that I cannot have null in is(null).

Solution 1:

You can use IsNull.nullValue() method:

import static org.hamcrest.Matchers.is;
import static org.hamcrest.Matchers.nullValue;

assertThat(attr.getValue(), is(nullValue()));

Solution 2:

why not use assertNull(object) / assertNotNull(object) ?

Solution 3:

If you want to hamcrest, you can do

import static org.hamcrest.Matchers.nullValue;

assertThat(attr.getValue(), is(nullValue()));

In Junit you can do

import static junit.framework.Assert.assertNull;
assertNull(object);