'use strict'; const common = require('../common'); const dc = require('diagnostics_channel'); const assert = require('assert'); const channel = dc.tracingChannel('test'); const expectedError = new Error('test'); const input = { foo: 'bar' }; const thisArg = { baz: 'buz' }; function check(found) { assert.deepStrictEqual(found, input); } const handlers = { start: common.mustCall(check), end: common.mustCall(check), asyncStart: common.mustCall(check), asyncEnd: common.mustCall(check), error: common.mustCall((found) => { check(found); assert.deepStrictEqual(found.error, expectedError); }) }; channel.subscribe(handlers); channel.tracePromise(function(value) { assert.deepStrictEqual(this, thisArg); return Promise.reject(value); }, input, thisArg, expectedError).then( common.mustNotCall(), common.mustCall((value) => { assert.deepStrictEqual(value, expectedError); }) );