Replace Integer with Item class
improve assertThrows tests
convert to Diamond
improve ClassCastException specs
cosmetic improvements
split jdk9 Atomic tests into separate *9Test.java files
improve main methods; respect system properties; actually fail if a test fails
delete extraneous blank lines
no wildcard imports
refactor and use assertThrows in NPE tests
Add basic tests for lambda-accepting JDK8 atomics methods
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