java - How to assertThat something is null with Hamcrest? -

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how assertthat null?

for example 

 assertthat(attr.getvalue(), is(""));

but error saying cannot have null in is(null).

you can use isnull.nullvalue() method:

import static org.hamcrest.matchers.is; import static org.hamcrest.matchers.nullvalue;  assertthat(attr.getvalue(), is(nullvalue()));

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