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import { vi } from "vitest";
// Define a proper type for the Chart mock constructor
type ChartMockConstructor = ReturnType<typeof vi.fn> & {
register: ReturnType<typeof vi.fn>;
defaults: {
font: { family: string };
plugins: { legend: { display: boolean } };
};
};
/**
* Setup function for Chart.js tests to standardize mocking
* @returns utilities for testing Chart.js components
*/
export function setupChartTest() {
// Create a mock Chart instance
const mockChartInstance = {
destroy: vi.fn(),
update: vi.fn(),
resize: vi.fn(),
data: { datasets: [] },
};
// Create a constructor mock with proper type
const mockConstructor = vi.fn(
() => mockChartInstance
) as ChartMockConstructor;
// Add static methods/properties that Chart has
mockConstructor.register = vi.fn();
mockConstructor.defaults = {
font: { family: "Arial" },
plugins: { legend: { display: false } },
};
// Create the chart mock module
const chartMock = {
__esModule: true,
default: mockConstructor,
};
// Mock canvas context
HTMLCanvasElement.prototype.getContext = vi
.fn()
.mockImplementation((contextId) => {
Eif (contextId === "2d") {
return {
canvas: { width: 200, height: 200 },
clearRect: vi.fn(),
fill: vi.fn(),
beginPath: vi.fn(),
stroke: vi.fn(),
moveTo: vi.fn(),
lineTo: vi.fn(),
arc: vi.fn(),
fillText: vi.fn(),
measureText: vi.fn().mockReturnValue({ width: 10 }),
save: vi.fn(),
restore: vi.fn(),
translate: vi.fn(),
rotate: vi.fn(),
} as unknown as CanvasRenderingContext2D;
}
return null;
});
// Mock browser APIs
globalThis.ResizeObserver = class ResizeObserver {
constructor(_callback: ResizeObserverCallback) {}
observe() {}
unobserve() {}
disconnect() {}
};
globalThis.requestAnimationFrame = vi.fn().mockImplementation((cb) => {
cb(0);
return 0;
});
return {
mockChartInstance,
mockConstructor,
chartMock,
renderChart: (component: React.ReactElement) => render(component),
cleanupMocks: () => {
vi.clearAllMocks();
vi.resetAllMocks();
},
};
}
/**
* Creates a properly typed mock for Chart.js that can be used in tests
*
* @returns An object containing the mocked Chart class and data collectors
*/
export function createChartMock() {
// Variables to store chart data for assertions in tests
let mockChartData: any = null;
let mockChartOptions: any = null;
// Create a properly typed mock Chart class
class MockChart {
// Define static register method with correct TypeScript typing
static register = vi.fn();
data: any;
options: any;
constructor(ctx: any, config: any) {
// Store chart data and options for test assertions
mockChartData = config.data;
mockChartOptions = config.options;
this.data = config.data;
this.options = config.options;
}
destroy = vi.fn();
update = vi.fn();
resize = vi.fn();
}
// Create the mock module
const chartModule = {
Chart: MockChart,
register: vi.fn(),
RadarController: {},
ArcElement: {},
RadialLinearScale: {},
PointElement: {},
LineElement: {},
Tooltip: {},
Legend: {},
// Add other Chart.js components as needed
};
// Return both the mock module and data collectors
return {
chartModule,
getMockData: () => mockChartData,
getMockOptions: () => mockChartOptions,
resetMockData: () => {
mockChartData = null;
mockChartOptions = null;
},
};
}
/**
* Setup function to mock browser APIs required by Chart.js
*/
export function setupChartEnvironment() {
// Mock ResizeObserver
window.ResizeObserver =
window.ResizeObserver ||
vi.fn().mockImplementation(() => ({
observe: vi.fn(),
unobserve: vi.fn(),
disconnect: vi.fn(),
}));
// Mock canvas context if needed
// Use proper type assertion to fix TypeScript error
HTMLCanvasElement.prototype.getContext = vi
.fn()
.mockImplementation((contextId) => {
Eif (contextId === "2d") {
return {
// Add canvas context methods as needed
clearRect: vi.fn(),
beginPath: vi.fn(),
arc: vi.fn(),
fill: vi.fn(),
// Add more methods as tests require them
} as unknown as CanvasRenderingContext2D;
}
return null;
});
// Return cleanup function
return () => {
vi.restoreAllMocks();
};
}
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