As it provides more Kotlin idiomatic asserters than Java asserters.

• Provides assertIs<T>(value) instead having to write assertTrue(value is T)
• Has a assertContentEquals which works with iterables instead requiring arrays like assertArrayEquals
• assertFails instead current assertThrows(Exception::class.java) which forces you to specify the type, there is a assertFailsWith also when a type is needed.
• Provides IDE lint when assertEquals can be used instead assertTrue and etc