Phpunit fix#4

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Xjiard wants to merge 3 commits intonextgen-tech:mainfrom

Xjiard:phpunit-fix

Commits on Aug 17, 2022

Added Consumer Variant Identifier (22) and Variant Count Identifier (30).
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Changed format for Variable Count to digits (1-8 length), and updated DecodeTest to include codes 22 (Consumer product variant) and 30 (Variant count of items).
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Commits on Aug 19, 2022

Determined the unit test was correct, but forgot to implement the VariableLength class on the ConsumerVariantIdentifier.
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