* `func` [<Function>]

* return [<String>]

Returns the file name and line number for the provided Function.

exports.getCallSite = function getCallSite(top) {

const originalStackFormatter = Error.prepareStackTrace;

Error.prepareStackTrace = (err, stack) =>

`${stack[0].getFileName()}:${stack[0].getLineNumber()}`;

const err = new Error();

Error.captureStackTrace(err, top);

// with the V8 Error API, the stack is not formatted until it is accessed

err.stack;

Error.prepareStackTrace = originalStackFormatter;

return err.stack;

const callSite = exports.getCallSite(exports.mustNotCall);

assert.fail(

`${msg || 'function should not have been called'} at ${callSite}`);

const common = require('../common');

const assert = require('assert');

const path = require('path');

const message = 'message';

const testFunction = common.mustNotCall(message);

const validateError = common.mustCall((e) => {

const prefix = `${message} at `;

assert.ok(e.message.startsWith(prefix));

if (process.platform === 'win32') {

e.message = e.message.substring(2); // remove 'C:'

}

const [ fileName, lineNumber ] = e.message

.substring(prefix.length).split(':');

assert.strictEqual(path.basename(fileName), 'test-common-must-not-call.js');

assert.strictEqual(lineNumber, '8');

try {

testFunction();

} catch (e) {

validateError(e);