import { describe, expect, it } from "@effect/vitest"; import { COMPOSER_MENTION_DRAG_TYPE } from "~/components/chat/composerMentionDrag";import { createFileTreeDragMentionController } from "./fileTreeDragMention.ts"; const makeTransfer = (plainText = "") => {  const data = new Map<string, string>([["text/plain", plainText]]);  return {    setData: (format: string, value: string) => void data.set(format, value),    getData: (format: string) => data.get(format) ?? "",    data,  };}; const rowNode = (path: string) => ({  getAttribute: (name: string) => (name === "data-item-path" ? path : null),}); describe("createFileTreeDragMentionController", () => {  it("tags a row drag with the mention payload and flags the drag", () => {    const controller = createFileTreeDragMentionController({ deselect: () => {} });    const transfer = makeTransfer();    controller.handleDragStart({      dataTransfer: transfer,      composedPath: () => [{}, rowNode("docs/index.md"), {}],    });    expect(transfer.getData(COMPOSER_MENTION_DRAG_TYPE)).toBe("[index.md](docs/index.md)");    expect(controller.isDragInProgress()).toBe(true);  });   it("strips the trailing slash from directory rows", () => {    const controller = createFileTreeDragMentionController({ deselect: () => {} });    const transfer = makeTransfer();    controller.handleDragStart({      dataTransfer: transfer,      composedPath: () => [rowNode("docs/architecture/")],    });    expect(transfer.getData(COMPOSER_MENTION_DRAG_TYPE)).toBe("[architecture](docs/architecture)");  });   it("does not tag drags of selected text from the panel chrome", () => {    // Only a drag that originates on a tree row is a mention; dragging a text    // selection also carries text/plain, and tagging it would drop an invalid    // pill into the composer.    const controller = createFileTreeDragMentionController({ deselect: () => {} });    const transfer = makeTransfer("selected text");    controller.handleDragStart({ dataTransfer: transfer, composedPath: () => [{}] });    expect(transfer.data.has(COMPOSER_MENTION_DRAG_TYPE)).toBe(false);    expect(controller.isDragInProgress()).toBe(false);  });   it("ignores drags that carry no row path", () => {    const controller = createFileTreeDragMentionController({ deselect: () => {} });    const transfer = makeTransfer();    controller.handleDragStart({ dataTransfer: transfer, composedPath: () => [{}] });    expect(transfer.data.has(COMPOSER_MENTION_DRAG_TYPE)).toBe(false);    expect(controller.isDragInProgress()).toBe(false);  });   it("deselects the dragged row exactly once when the drag ends", () => {    const deselected: Array<string> = [];    const controller = createFileTreeDragMentionController({      deselect: (path) => deselected.push(path),    });    controller.handleDragStart({      dataTransfer: makeTransfer(),      composedPath: () => [rowNode("src/app.ts")],    });    controller.handleDragEnd();    controller.handleDragEnd();    expect(deselected).toEqual(["src/app.ts"]);    expect(controller.isDragInProgress()).toBe(false);  });   it("drags the whole selection when the dragged row is part of it", () => {    const deselected: Array<string> = [];    const controller = createFileTreeDragMentionController({      deselect: (path) => deselected.push(path),    });    controller.handleSelectionChange(["docs/index.md", "docs/api.md", "src/app.ts"]);    const transfer = makeTransfer();    controller.handleDragStart({      dataTransfer: transfer,      composedPath: () => [rowNode("docs/api.md")],    });    expect(transfer.getData(COMPOSER_MENTION_DRAG_TYPE)).toBe(      "[index.md](docs/index.md) [api.md](docs/api.md) [app.ts](src/app.ts)",    );    controller.handleDragEnd();    expect(deselected).toEqual(["docs/index.md", "docs/api.md", "src/app.ts"]);  });   it("drags only the row under the cursor when it is outside the selection", () => {    const controller = createFileTreeDragMentionController({ deselect: () => {} });    controller.handleSelectionChange(["docs/index.md"]);    const transfer = makeTransfer();    controller.handleDragStart({      dataTransfer: transfer,      composedPath: () => [rowNode("src/app.ts")],    });    expect(transfer.getData(COMPOSER_MENTION_DRAG_TYPE)).toBe("[app.ts](src/app.ts)");  });   it("does not deselect anything when no drag was started", () => {    const deselected: Array<string> = [];    const controller = createFileTreeDragMentionController({      deselect: (path) => deselected.push(path),    });    controller.handleDragEnd();    expect(deselected).toEqual([]);  });});