Add unit test infrastructure (311 tests, 94% coverage)#16

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douglas wants to merge 9 commits intomasterfrom

add-unit-test-infrastructure

Commits on Mar 13, 2026

Add unit test infrastructure: Rakefile tasks, gemspec deps, rubocop config
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Add unit tests: infrastructure helper + Batch 1 (type system, registry, errors, column)
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Add unit tests: Batch 2-3 (quoting, database statement internals)
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Add unit tests: Batch 4-5 (metadata, connection, concerns, adapter subclasses)
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Add unit tests: Batch 6 (schema statement helpers) + update README
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Fix rubocop offenses and method-redefined warning in unit tests
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Fill unit test coverage gaps: 233 -> 311 tests, 86% -> 94% coverage
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Fix TypeError in PostgreSQL create_database: pass '' to sum for string concatenation
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Add unit tests: Batch 7 (round 3 coverage gaps)
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