### Question:
AWSEnvironment { @Override public int hashCode() { return Objects.hash(account, region); } AWSEnvironment(String account, String region); String getAccount(); String getRegion(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testHashCode(){ String account = "Hello"; String region = "World"; AWSEnvironment awsEnvironment1 = new AWSEnvironment(account, region); Assert.assertEquals("Test hashCode() method", Objects.hash(account, region), awsEnvironment1.hashCode()); }