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test/parallel/test-diagnostics-channel-tracing-channel-promise.js

@@ -0,0 +1,41 @@
+'use strict';
+
+const common = require('../common');
+const dc = require('diagnostics_channel');
+const assert = require('assert');
+
+const channel = dc.tracingChannel('test');
+
+const expectedResult = { foo: 'bar' };
+const input = { foo: 'bar' };
+const thisArg = { baz: 'buz' };
+
+function check(found) {
+  assert.deepStrictEqual(found, input);
+}
+
+function checkAsync(found) {
+  check(found);
+  assert.strictEqual(found.error, undefined);
+  assert.deepStrictEqual(found.result, expectedResult);
+}
+
+const handlers = {
+  start: common.mustCall(check),
+  end: common.mustCall(check),
+  asyncStart: common.mustCall(checkAsync),
+  asyncEnd: common.mustCall(checkAsync),
+  error: common.mustNotCall()
+};
+
+channel.subscribe(handlers);
+
+channel.tracePromise(function(value) {
+  assert.deepStrictEqual(this, thisArg);
+  return Promise.resolve(value);
+}, input, thisArg, expectedResult).then(
+  common.mustCall((value) => {
+    assert.deepStrictEqual(value, expectedResult);
+  }),
+  common.mustNotCall()
+);