fusion/plugins/fusion-plugin-dependency-graph/src/__tests__/GraphTaskNode.drag.test.tsx

import { afterEach, describe, expect, it, vi } from "vitest";
import { cleanup, fireEvent, render, screen } from "@testing-library/react";
import type React from "react";
import type { Task } from "@fusion/core";
import { GraphTaskNode } from "../GraphTaskNode";
/*
FNXC:DependencyGraphTests 2026-07-08-13:10:
GraphTaskNode renders the REAL TaskCard; TaskCard's RuntimeFallbackBadge calls the dashboard's useToast() hook, and this file has no ToastProvider. Mock useToast (same as the dashboard's own TaskCard.test.tsx) to avoid "useToast must be used within ToastProvider".
*/
vi.mock("@fusion/dashboard/app/hooks/useToast", () => ({
  useToast: () => ({ addToast: vi.fn(), removeToast: vi.fn(), toasts: [] }),
}));

function task(id = "FN-1"): Task {
  return { id, description: id, column: "todo", dependencies: [], steps: [], currentStep: 0, log: [] } as Task;
}

function props(overrides: Partial<React.ComponentProps<typeof GraphTaskNode>> = {}): React.ComponentProps<typeof GraphTaskNode> {
  return {
    task: task(),
    projectId: "p1",
    position: { x: 0, y: 0 },
    scale: 1,
    isSelected: false,
    isHighlighted: false,
    isDimmed: false,
    onNodePositionChange: vi.fn(),
    onNodeDragStateChange: vi.fn(),
    onOpenDetail: vi.fn(),
    addToast: vi.fn(),
    onUpdateTask: vi.fn(),
    onArchiveTask: vi.fn(),
    onUnarchiveTask: vi.fn(),
    onDeleteTask: vi.fn(),
    onRetryTask: vi.fn(),
    onOpenDetailWithTab: vi.fn(),
    onMoveTask: vi.fn(),
    onOpenMission: vi.fn(),
    taskStuckTimeoutMs: 1000,
    lastFetchTimeMs: Date.now(),
    workflowStepNameLookup: new Map<string, string>(),
    ...overrides,
  };
}

afterEach(() => {
  cleanup();
});

describe("GraphTaskNode drag", () => {
  it("does not open detail after drag threshold is exceeded", () => {
    const onOpenDetail = vi.fn();
    render(<GraphTaskNode {...props({ onOpenDetail, isSelected: true })} />);
    const node = screen.getByTestId("graph-task-node-FN-1");

    fireEvent.pointerDown(node, { pointerId: 1, clientX: 10, clientY: 10, isPrimary: true });
    fireEvent.pointerMove(node, { pointerId: 1, clientX: 25, clientY: 25, isPrimary: true });
    fireEvent.pointerUp(node, { pointerId: 1, clientX: 25, clientY: 25, isPrimary: true });
    fireEvent.click(node);

    expect(onOpenDetail).not.toHaveBeenCalled();
  });

  it("applies dragging class only after threshold move", () => {
    const onNodePositionChange = vi.fn();
    render(<GraphTaskNode {...props({ onNodePositionChange, isSelected: true })} />);
    const node = screen.getByTestId("graph-task-node-FN-1");

    fireEvent.pointerDown(node, { pointerId: 1, clientX: 10, clientY: 10, isPrimary: true });
    fireEvent.pointerMove(node, { pointerId: 1, clientX: 12, clientY: 12, isPrimary: true });
    expect(node.className).not.toContain("graph-node--dragging");

    fireEvent.pointerMove(node, { pointerId: 1, clientX: 20, clientY: 20, isPrimary: true });
    expect(node.className).toContain("graph-node--dragging");
    expect(onNodePositionChange).toHaveBeenCalled();

    fireEvent.pointerUp(node, { pointerId: 1, clientX: 20, clientY: 20, isPrimary: true });
    expect(node.className).not.toContain("graph-node--dragging");
  });

  it("composes highlight and dragging classes", () => {
    render(<GraphTaskNode {...props({ isSelected: true, isHighlighted: true })} />);
    const node = screen.getByTestId("graph-task-node-FN-1");
    fireEvent.pointerDown(node, { pointerId: 1, clientX: 0, clientY: 0, isPrimary: true });
    fireEvent.pointerMove(node, { pointerId: 1, clientX: 10, clientY: 10, isPrimary: true });

    expect(node.className).toContain("graph-task-node--highlighted");
    expect(node.className).toContain("graph-node--dragging");
  });

  it("does not drag when node is not selected", () => {
    const onNodePositionChange = vi.fn();
    render(<GraphTaskNode {...props({ onNodePositionChange, isSelected: false })} />);
    const node = screen.getByTestId("graph-task-node-FN-1");

    fireEvent.pointerDown(node, { pointerId: 1, clientX: 10, clientY: 10, isPrimary: true });
    fireEvent.pointerMove(node, { pointerId: 1, clientX: 25, clientY: 25, isPrimary: true });

    expect(node.className).not.toContain("graph-node--dragging");
    expect(node.className).not.toContain("graph-node--draggable");
    expect(onNodePositionChange).not.toHaveBeenCalled();
  });
});