Creator key

[shadrach68]

Summary

This PR adds unit testing for the get_key_decimals method to prevent silent regressions if the value is ever changed. It ensures the contract consistently reports the expected token standard decimals (7).

Changes

• Added matching test: Asserts that client.get_key_decimals() exactly matches the local EXPECTED_DECIMALS constant (set to 7).
• Added consistency test: Asserts that the decimals value remains strictly identical across state changes as different creators are registered.
• Defined constant: Added the EXPECTED_DECIMALS named constant directly in the test file as requested.

Related Issues

Closes #364

Checklist

• The decimals method returns the expected token standard value.
• The value is consistent across different creator instances.
• The expected value is defined as a named constant in the test.
• Code passes cargo test --workspace locally.

[drips-wave]

@shadrach68 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits