Add IBC test cases

[zsystm]

Description

(wip)

Closes: #XXXX

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Author Checklist

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• tackled an existing issue or discussed with a team member
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Reviewers Checklist

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I have...

• added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• confirmed all author checklist items have been addressed
• confirmed that this PR does not change production code
• reviewed content
• tested instructions (if applicable)
• confirmed all CI checks have passed