import { ExpressionError } from 'n8n-workflow';
import { stringifyExpressionResult } from '../expressions';

describe('stringifyExpressionResult()', () => {
	it('should return empty string for non-critical errors', () => {
		expect(
			stringifyExpressionResult({
				ok: false,
				error: new ExpressionError('error message', { type: 'no_execution_data' }),
			}),
		).toEqual('');
	});

	it('should return an error message for critical errors', () => {
		expect(
			stringifyExpressionResult({
				ok: false,
				error: new ExpressionError('error message', { type: 'no_input_connection' }),
			}),
		).toEqual('[ERROR: No input connected]');
	});

	it('should return empty string when result is null', () => {
		expect(stringifyExpressionResult({ ok: true, result: null })).toEqual('');
	});

	it('should return NaN when result is NaN', () => {
		expect(stringifyExpressionResult({ ok: true, result: NaN })).toEqual('NaN');
	});

	it('should return [empty] message when result is empty string', () => {
		expect(stringifyExpressionResult({ ok: true, result: '' })).toEqual('[empty]');
	});

	it('should return the result when it is a string', () => {
		expect(stringifyExpressionResult({ ok: true, result: 'foo' })).toEqual('foo');
	});
});