Mockito: To test that a returned String is under a given length - spring-boot

Question

In Junit I want to check that length of a returned String is under a given length .
I am doing the following and it is passing . But I want to know that is there any better alternate solution it test it.
Assertions.assertTrue(roomEntity.getRoomType().length()<=10);
Thanks

Answer 1

Your attempt is good. You could use assertThat(), that may be a bit more readable.
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.junit.Assert.assertThat;
...
assertThat(roomEntity.getRoomType().length(), lessThanOrEqualTo(10));
Or refactor the length into its own variable.
import static org.hamcrest.Matchers.lessThanOrEqualTo;
import static org.junit.Assert.assertThat;
...
int roomTypeLength = roomEntity.getRoomType().length();
assertThat(roomTypeLength, lessThanOrEqualTo(10));

Answer 2

Here is the way I am following for this.
You can use one of these libraries. Both works the same.
<!-- https://mvnrepository.com/artifact/org.assertj/assertj-core -->
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.16.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.easytesting/fest-assert -->
<dependency>
<groupId>org.easytesting</groupId>
<artifactId>fest-assert</artifactId>
<version>1.4</version>
<scope>test</scope>
</dependency>
Now to the code segment.
Assertions.assertThat(roomEntity.getRoomType().length()).isLessThanOrEqualTo(10);
There are some other useful ways are also included in this such as isLessThan, isBetween, hasSize etc.