[Contract] — Test: `generate_invite_code` on a public market returns an error

[Olowodarey]

Background

invite::generate_invite_code (src/invite.rs) should not allow generating
invite codes for public markets (is_public: true) since those accept everyone.
There is no test in tests/invite_tests.rs that verifies this guard.

Goal

Add a test confirming public-market invite rejection and a companion test for a
private market.

Tasks

1. Create a market with is_public: true; call generate_invite_code; assert
2. Create a market with is_public: false; call generate_invite_code; assert

Acceptance Criteria

• Public market invite generation is rejected.
• Private market invite generation succeeds.

Files

contracts/open-market/tests/invite_tests.rs.

[ekwe7]

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[muhahahmad68]

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[dotunv]

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