feat(integration): Go-native runner for YAML integration tests (POC)

[amir-deris]

Summary

• Adds integration_test/runner/ — a Go-native driver for the existing YAML integration test suite that replaces the Python runner.py for covered modules
• Keeps all existing YAML test files unchanged; the runner parses the same schema
• Wires one CI matrix job ("Mint & Staking & Bank Module") to the Go runner as a proof-of-concept, leaving the parallel Autobahn job on Python for side-by-side comparison

Motivation

The Python runner has a few pain points:

• Failures stop the entire file (exit(1)) with no subtest isolation
• No -run flag to target a single test case without editing files
• Output is flat print() statements with no structured test reporting
• Python dependency in a Go project's CI

The Go runner addresses all of these through standard go test integration.

How it works

Each YAML file maps to a t.Run subtest, so failures are isolated and the full -v output shows every command and its captured output. The eval verifier uses big.Int → float64 → string comparison (in that order) to handle the large token supply integers in the existing YAML assertions without float64 precision loss.

Run a single module locally (requires a running cluster):

go test -tags yaml_integration -v ./integration_test/runner/... -run TestBankModule

Target a single test case:

go test -tags yaml_integration -v ./integration_test/runner/... -run TestBankModule/Test_sending_funds

[cursor]

PR Summary

Low Risk
Test harness and CI wiring only; YAML scenarios unchanged and Autobahn still exercises the Python path.

Overview
Introduces a Go-native YAML integration test runner (integration_test/runner/) that drives the same YAML files as runner.py through standard go test, with each YAML case as a named subtest (-run filtering, per-case failures, verbose command logs).

The runner unmarshals inputs/verifiers, runs commands via docker exec (default sei-node-0) or local bash, and implements eval / regex verifiers with Python-compatible logic—including big.Int comparisons for large supply integers. gopkg.in/yaml.v3 is promoted to a direct module dependency.

CI POC: the Mint & Staking & Bank Module matrix job now runs go test -tags yaml_integration for TestMintModule, TestStakingModule, and TestBankModule/Test_sending_funds instead of three separate runner.py invocations; the parallel Autobahn job still uses Python for side-by-side comparison.

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jun 3, 2026, 1:40 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 176 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.22%. Comparing base (2151ba0) to head (cac538b).

Files with missing lines	Patch %	Lines
integration_test/runner/runner.go	0.00%	176 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3537      +/-   ##
==========================================
- Coverage   59.12%   58.22%   -0.91%     
==========================================
  Files        2213     2141      -72     
  Lines      182814   174607    -8207     
==========================================
- Hits       108096   101660    -6436     
+ Misses      64993    63901    -1092     
+ Partials     9725     9046     -679     

Flag	Coverage Δ
sei-chain-pr	0.00% <0.00%> (?)
sei-db	70.41% <ø> (ø)
sei-db-state-db	?

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Files with missing lines	Coverage Δ
integration_test/runner/runner.go	0.00% <0.00%> (ø)

... and 73 files with indirect coverage changes

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