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

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at org.assertj.core.error.ShouldBeEqual.detailedToStringOf(
at org.assertj.core.error.ShouldBeEqual.detailedActual(
at org.assertj.core.error.ShouldBeEqual.defaultDetailedErrorMessage(
at org.assertj.core.error.ShouldBeEqual.newAssertionError(
at org.assertj.core.internal.Failures.failure(
at org.assertj.core.internal.Objects.assertEqual(
at undefined.SampleTest.testIsEqualTo(

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