Split the large syncer test suite into focused test files

[danieljhkim]

Task

T20260510-21 — Split the large syncer test suite into focused test files

Description

Problem

internal/sync/syncer_test.go is over 1,000 lines and includes fake repositories/config stores/state stores, environment setup, push tests, dry-run tests, cancellation tests, pull verification tests, workspace-reference tests, and commit-message tests. The size makes test failures harder to navigate and increases merge-conflict risk for unrelated sync work.

Why It Matters

Moving shared fakes/helpers and scenario groups into focused test files lets multiple sync changes land with less contention. It also makes the production sync refactor task safer because the test cleanup can happen independently.

Constraints / Notes

• Treat this as a test-only, behavior-preserving refactor.
• Keep package-level access to unexported sync helpers where tests currently need it; do not force production API changes.
• Good target split: shared test fakes/setup, push tests, pull tests, workspace-reference tests, and commit-message tests.
• Do not modify production sync files in this task unless a compile-only rename is unavoidable.

Acceptance Criteria

• internal/sync/syncer_test.go is split into focused test files and no single remaining sync test file owns all fakes, setup, push, pull, workspace-reference, and commit-message coverage together.
• Shared fakes and setup helpers are defined once and reused by the split test files without duplicate fake implementations.
• go test -v ./internal/sync passes.
• go test -v ./internal/... passes.

Execution Summary

Click to expand

Outcome: success

Changes:

• Replaced the monolithic internal/sync/syncer_test.go with focused sync test files for shared helpers, push behavior, workspace references, pull behavior, and commit-message coverage.
• Kept fakes and setup helpers defined once in internal/sync/syncer_test_helpers_test.go and reused across the split files.

Validation:

• go test -v ./internal/sync
• go test -v ./internal/...

Assessment: Behavior-preserving test-only refactor; both required validation commands pass.

Validation

• Not reported

Branch Freshness

• Base ref: origin/main
• Head ref: orbit/T20260510-21-6a00ea9b
• Behind base: 0
• Ahead of base: 1

authored by: gpt-5