Full Canvas Test Suite

[BaconCat1]

This pull request is a work in progress and is not ready to merge.

The initial commit wires Canvas-specific server tests into JUnit. Individual
tests and test infrastructure will be added over time.

Below is a list of planned tests.

API Events and Lifecycle

• World unload result status
• Async entity portal event state
• Post-portal event state
• Async entity teleport event state
• Post-teleport event state
• Player save event reason
• End credits event decisions
• Async world unload event state
• Async player respawn event state
• Post-respawn event state

General Utilities

• Region section coordinate packing
• Canonical reference initialization
• Collecting list operations
• Locked reference concurrency
• Time span parsing and serialization
• Time span validation
• Time span instant calculations
• Weak concurrent collection operations
• Faster random source determinism
• Utility time formatting
• Utility string and flag handling
• Utility future waiting
• Utility directory cleanup
• Utility text gradients
• Silent logger behavior
• CPU information reporting
• Collecting list cast failure
• Faster random bounds
• Faster random positional formula
• Flowable fluid utilities
• Time span large units
• Time span overflow
• Utility random derivation
• Utility target time
• Canvas version fetcher basics

Collections, Maps, and Tickets

• Fast heap priority queue operations
• Activity bit-set semantics
• Activity array-map semantics
• Behavior control array-set semantics
• Ticket holder lifecycle
• Weak concurrent collection array contract
• Weak concurrent collection compaction
• Fast heap priority queue differential
• Activity array-map differential
• Behavior control array-set iteration
• Trojan array list
• Ticket record callback

Structures and Migrations

• Structure utility helpers
• Box octree spatial queries
• Legacy pearl tag migration
• Compressed pearl file migration
• Paletted structure block compression
• Pearls migration corrupt file
• Box octree boundary
• Box octree cross-octant behavior
• Paletted structure block info empty state
• Paletted structure block info identity
• Paletted structure block info packing
• Structure template optimizer bounds
• Structure template optimizer fallback
• Structure template optimizer transform

SIMD

• SIMD Java version detection
• SIMD map-palette parity
• Vector map-palette boundary length
• Vector map-palette randomized behavior

Spark and Commands

• Unsupported Folia duration statistics
• Folia platform metadata
• Folia player ping snapshots
• Folia class-source lookup
• Folia server configuration inventory
• Folia server configuration YAML parser
• Folia world information counts
• Subcommand metadata
• Subcommand tree
• World distance type

World, Blocks, Bars, and Chunks

• Per-world distance configuration
• Natural spawn chunk-map coverage
• Combined heightmap updates
• Cached block-state tags
• Region resource-bar codec
• Region resource-bar display manager
• Region resource-bar format
• Region resource-bar tick
• Regionized bar normalization
• Sleep-until-time block-entity tick invoker
• Sleeping ticker
• Balanced chunk-system lifecycle
• Balanced chunk-system priority
• Combined heightmap bottom boundary
• Natural spawn chunk-map radius

Region-Threading

• Same region never ticks concurrently
• Independent regions tick concurrently
• Region split transfers scheduled work exactly once
• Region merge transfers scheduled work exactly once
• Region retirement rejects new work
• Scheduler exception isolation
• Scheduler shutdown drains accepted work
• Scheduler shutdown rejects late work
• Affinity scheduler preserves region ownership
• Cross-region entity movement
• Cross-region player teleport
• Cross-world player teleport
• Portal event ordering across regions
• Respawn event ordering across regions
• Player disconnect during teleport
• Player save racing with world unload
• Entity removal racing with region transfer
• Regionized scoreboard snapshot consistency
• Region profiler registration and cleanup
• Region watchdog detection
• World shutdown with multiple active regions

Persistence and Recovery

• Ender pearl save and restart restoration
• Ender pearl migration idempotence
• Interrupted migration recovery
• Corrupt migration input preserves the original file
• Atomic player-save replacement
• Crash during player save
• Crash during world save
• Restart after an unclean shutdown
• World-folder migration collision handling
• Configuration write interruption recovery
• Malformed configuration fallback
• Per-world configuration isolation

Networking and Commands

• Alternative keepalive normal response
• Alternative keepalive timeout
• Disconnect during keepalive
• Signed chat packet processing on the correct region
• Signed command packet processing on the correct region
• Command execution permission checks
• Command execution from console
• Command execution from a region-owned player
• Command callback after sender disconnect
• Invalid command argument reporting
• Region-bar command lifecycle
• Reload command failure rollback
• Maximum-player command boundaries

Chunk and World Behavior

• Chunk task priority ordering
• Chunk task cancellation
• Chunk executor exception isolation
• Chunk executor shutdown
• Stream-group completion
• Stream-group partial failure
• Natural spawning across region boundaries
• Heightmap updates at world minimum and maximum
• Sleeping block entity wake-up
• Sleeping block entity removal while queued
• Region resource-bar cleanup after logout
• Region resource-bar transfer between worlds
• Region resource-bar invalid persisted data
• World unload with pending chunk work