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* Coherent.js Test Utilities
*
* Helper functions for testing Coherent.js components
*
* @module testing/test-utils
*/
/**
* Simulate an event on an element
*
* @param {Object} element - Element to fire event on
* @param {string} eventType - Type of event (click, change, etc.)
* @param {Object} [eventData] - Additional event data
*/
export function fireEvent(element, eventType, eventData = {}) {
if (!element) {
throw new Error('Element is required for fireEvent');
}
// In a test environment, we simulate the event
const event = {
type: eventType,
target: element,
currentTarget: element,
preventDefault: () => {},
stopPropagation: () => {},
...eventData
};
// If element has an event handler, call it
const handlerName = `on${eventType}`;
if (element[handlerName] && typeof element[handlerName] === 'function') {
element[handlerName](event);
}
return event;
}
/**
* Common event helpers
*/
export const fireEvent_click = (element, eventData) =>
fireEvent(element, 'click', eventData);
export const fireEvent_change = (element, value) =>
fireEvent(element, 'change', { target: { value } });
export const fireEvent_input = (element, value) =>
fireEvent(element, 'input', { target: { value } });
export const fireEvent_submit = (element, eventData) =>
fireEvent(element, 'submit', eventData);
export const fireEvent_keyDown = (element, key) =>
fireEvent(element, 'keydown', { key });
export const fireEvent_keyUp = (element, key) =>
fireEvent(element, 'keyup', { key });
export const fireEvent_focus = (element) =>
fireEvent(element, 'focus');
export const fireEvent_blur = (element) =>
fireEvent(element, 'blur');
/**
* Wait for a condition to be true
*
* @param {Function} condition - Condition function
* @param {Object} [options] - Wait options
* @param {number} [options.timeout=1000] - Timeout in ms
* @param {number} [options.interval=50] - Check interval in ms
* @returns {Promise<void>}
*
* @example
* await waitFor(() => getByText('Loaded').exists, { timeout: 2000 });
*/
export function waitFor(condition, options = {}) {
const { timeout = 1000, interval = 50 } = options;
return new Promise((resolve, reject) => {
const startTime = Date.now();
const check = () => {
try {
if (condition()) {
resolve();
return;
}
} catch {
// Condition threw an error, keep waiting
}
if (Date.now() - startTime >= timeout) {
reject(new Error(`Timeout waiting for condition after ${timeout}ms`));
return;
}
setTimeout(check, interval);
};
check();
});
}
/**
* Wait for element to appear
*
* @param {Function} queryFn - Query function that returns element
* @param {Object} [options] - Wait options
* @returns {Promise<Object>} Element
*/
export async function waitForElement(queryFn, options = {}) {
let element = null;
await waitFor(() => {
element = queryFn();
return element !== null;
}, options);
return element;
}
/**
* Wait for element to disappear
*
* @param {Function} queryFn - Query function that returns element
* @param {Object} [options] - Wait options
* @returns {Promise<void>}
*/
export async function waitForElementToBeRemoved(queryFn, options = {}) {
await waitFor(() => {
const element = queryFn();
return element === null;
}, options);
}
/**
* Act utility for batching updates
* Useful for testing state changes
*
* @param {Function} callback - Callback to execute
* @returns {Promise<void>}
*/
export async function act(callback) {
await callback();
// Allow any pending updates to flush
await new Promise(resolve => setTimeout(resolve, 0));
}
/**
* Create a mock function
*
* @param {Function} [implementation] - Optional implementation
* @returns {Function} Mock function
*/
export function createMock(implementation) {
const calls = [];
const results = [];
const mockFn = function(...args) {
calls.push(args);
let result;
let error;
try {
result = implementation ? implementation(...args) : undefined;
results.push({ type: 'return', value: result });
} catch (err) {
error = err;
results.push({ type: 'throw', value: error });
throw error;
}
return result;
};
// Add mock utilities
mockFn.mock = {
calls,
results,
instances: []
};
mockFn.mockClear = () => {
calls.length = 0;
results.length = 0;
};
mockFn.mockReset = () => {
mockFn.mockClear();
implementation = undefined;
};
mockFn.mockImplementation = (fn) => {
implementation = fn;
return mockFn;
};
mockFn.mockReturnValue = (value) => {
implementation = () => value;
return mockFn;
};
mockFn.mockResolvedValue = (value) => {
implementation = () => Promise.resolve(value);
return mockFn;
};
mockFn.mockRejectedValue = (error) => {
implementation = () => Promise.reject(error);
return mockFn;
};
return mockFn;
}
/**
* Create a spy on an object method
*
* @param {Object} object - Object to spy on
* @param {string} method - Method name
* @returns {Function} Spy function
*/
export function createSpy(object, method) {
const original = object[method];
const spy = createMock(original.bind(object));
object[method] = spy;
spy.mockRestore = () => {
object[method] = original;
};
return spy;
}
/**
* Cleanup utility
* Cleans up after tests
*/
export function cleanup() {
// Clear any timers
// Reset any global state
// This would be expanded based on framework needs
}
/**
* Within utility - scopes queries to a container
*
* @param {Object} container - Container result
* @returns {Object} Scoped queries
*/
export function within(container) {
return {
getByTestId: (testId) => container.getByTestId(testId),
queryByTestId: (testId) => container.queryByTestId(testId),
getByText: (text) => container.getByText(text),
queryByText: (text) => container.queryByText(text),
getByClassName: (className) => container.getByClassName(className),
queryByClassName: (className) => container.queryByClassName(className)
};
}
/**
* Screen utility - global queries
* Useful for accessing rendered content without storing result
*/
export const screen = {
_result: null,
setResult(result) {
this._result = result;
},
getByTestId(testId) {
Eif (!this._result) throw new Error('No component rendered');
return this._result.getByTestId(testId);
},
queryByTestId(testId) {
Eif (!this._result) return null;
return this._result.queryByTestId(testId);
},
getByText(text) {
Eif (!this._result) throw new Error('No component rendered');
return this._result.getByText(text);
},
queryByText(text) {
Eif (!this._result) return null;
return this._result.queryByText(text);
},
getByClassName(className) {
Eif (!this._result) throw new Error('No component rendered');
return this._result.getByClassName(className);
},
queryByClassName(className) {
Eif (!this._result) return null;
return this._result.queryByClassName(className);
},
debug() {
if (this._result) {
this._result.debug();
}
}
};
/**
* User event simulation
* More realistic event simulation than fireEvent
*/
export const userEvent = {
/**
* Simulate user typing
*/
type: async (element, text, options = {}) => {
const { delay = 0 } = options;
for (const char of text) {
fireEvent_keyDown(element, char);
fireEvent_input(element, element.value + char);
fireEvent_keyUp(element, char);
if (delay > 0) {
await new Promise(resolve => setTimeout(resolve, delay));
}
}
},
/**
* Simulate user click
*/
click: async (element) => {
fireEvent_focus(element);
fireEvent_click(element);
},
/**
* Simulate user double click
*/
dblClick: async (element) => {
await userEvent.click(element);
await userEvent.click(element);
},
/**
* Simulate user clearing input
*/
clear: async (element) => {
fireEvent_input(element, '');
fireEvent_change(element, '');
},
/**
* Simulate user selecting option
*/
selectOptions: async (element, values) => {
const valueArray = Array.isArray(values) ? values : [values];
fireEvent_change(element, valueArray[0]);
},
/**
* Simulate user tab navigation
*/
tab: async () => {
// Simulate tab key
const activeElement = document.activeElement;
if (activeElement) {
fireEvent_keyDown(activeElement, 'Tab');
fireEvent_blur(activeElement);
}
}
};
/**
* Export all utilities
*/
export default {
fireEvent,
waitFor,
waitForElement,
waitForElementToBeRemoved,
act,
createMock,
createSpy,
cleanup,
within,
screen,
userEvent
};
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