java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.assertj.core.error.ShouldBeEqual.detailedToStringOf(ShouldBeEqual.java:188)
at org.assertj.core.error.ShouldBeEqual.detailedActual(ShouldBeEqual.java:193)
at org.assertj.core.error.ShouldBeEqual.defaultDetailedErrorMessage(ShouldBeEqual.java:163)
at org.assertj.core.error.ShouldBeEqual.newAssertionError(ShouldBeEqual.java:114)
at org.assertj.core.internal.Failures.failure(Failures.java:91)
at org.assertj.core.internal.Objects.assertEqual(Objects.java:321)
at undefined.SampleTest.testIsEqualTo(SampleTest.java:16)

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