Fix argument accumulation bug in integration test

[gcomte]

Summary

• test_different_amount_of_arguments reused a single Command, causing .args() to accumulate. The "1 argument" case actually ran with 1 arg, "2 arguments" with 2, and "3 arguments" with 3 — only by accident.
• Split into 4 independent tests, each with a fresh Command.

Test plan

• cargo test --test int_tests passes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6c2f4b01-3535-403f-b5c0-31b784a6c6fb

📥 Commits

Reviewing files that changed from the base of the PR and between abaa207 and 738773d.

📒 Files selected for processing (1)

• tests/int_tests.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/integration-test-arg-accumulation

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