🧪 Expand test coverage for Go Calculator sample

[undivisible]

🎯 What: Expanded the test suite for the Go Calculator class sample in apps/polyglot-sample/sample_class.go by introducing robust table-driven unit tests.

📊 Coverage: The tests now explicitly cover addition of positive numbers, negative numbers, and zero. Also introduced consecutive addition testing to verify internal state mutation accurately.

✨ Result: Test coverage for the Add method and Calculator lifecycle is complete and comprehensive, eliminating testing gaps for this sample.

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PR created automatically by Jules for task 12013296348968584816 started by @undivisible

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Note

Low Risk
Test-only changes in a sample app; no production or runtime behavior is modified.

Overview
Refactors TestCalculatorAdd into table-driven subtests (t.Run) for positive, negative, and zero addends, asserting both the return value and internal value on a fresh calculator each case.

Splits chained Add behavior into TestCalculatorAddConsecutive, covering cumulative totals (10 → 30 → 25) and the final stored value after multiple calls.

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