import { expect, it } from "@effect/vitest";import { ThreadId } from "@t3tools/contracts"; import {  CheckpointRefUnavailableError,  CheckpointTurnRangeUnavailableError,  CheckpointWorkspacePathMissingError,} from "./Errors.ts"; const threadId = ThreadId.make("thread-1"); it("derives checkpoint messages from structured context", () => {  const range = new CheckpointTurnRangeUnavailableError({    operation: "CheckpointDiffQuery.getTurnDiff",    threadId,    requestedTurnCount: 4,    availableTurnCount: 2,  });  const checkpoint = new CheckpointRefUnavailableError({    operation: "CheckpointDiffQuery.getTurnDiff",    threadId,    turnCount: 2,    checkpoint: "to",  });  const workspace = new CheckpointWorkspacePathMissingError({    operation: "CheckpointDiffQuery.getFullThreadDiff",    threadId,  });   expect(range.message).toBe(    "Checkpoint unavailable for thread thread-1 turn 4: Turn diff range exceeds current turn count: requested 4, current 2.",  );  expect(checkpoint.message).toBe(    "Checkpoint unavailable for thread thread-1 turn 2: Checkpoint ref is unavailable for turn 2.",  );  expect(workspace.message).toBe(    "Checkpoint invariant violation in CheckpointDiffQuery.getFullThreadDiff: Workspace path missing for thread 'thread-1' when computing full thread diff.",  );});