can-test-helpers

// For demonstration purposes, mock canDev if not in a full CanJS environment. // In a real CanJS app, 'can-log/dev/dev' would be imported or globally available. const canDev = { warn: (message: string) => console.warn(`canDev.warn: ${message}`), error: (message: string) => console.error(`canDev.error: ${message}`) }; import devHelpers from 'can-test-helpers/lib/dev'; // Example 1: Testing expected warnings const finishWarningCheck = devHelpers.willWarn("Something deprecated", (message, match) => { console.log(`Intercepted warning: "${message}" (matched: ${match})`); }); canDev.warn("Something deprecated"); canDev.warn("Another unrelated warning"); const matchedWarnings = finishWarningCheck(); console.assert(matchedWarnings === 1, `Expected 1 matched warning, got ${matchedWarnings}`); // Example 2: Testing expected errors const finishErrorCheck = devHelpers.willError(/critical error/i); try { // Simulate an error being caught and logged by canDev throw new Error("A critical error occurred!"); } catch (e) { canDev.error((e as Error).message); } const matchedErrors = finishErrorCheck(); console.assert(matchedErrors === 1, `Expected 1 matched error, got ${matchedErrors}`); console.log("Quickstart example completed. Check console output for assertions.");