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test/parallel/test-assert-calltracker-verify.js

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+'use strict';
+require('../common');
+const assert = require('assert');
+
+// This test ensures that assert.CallTracker.verify() works as intended.
+
+const tracker = new assert.CallTracker();
+
+const generic_msg = 'Functions were not called the expected number of times';
+
+function foo() {}
+
+function bar() {}
+
+const callsfoo = tracker.calls(foo, 1);
+const callsbar = tracker.calls(bar, 1);
+
+// Expects an error as callsfoo() and callsbar() were called less than one time.
+assert.throws(
+  () => tracker.verify(),
+  { message: generic_msg }
+);
+
+callsfoo();
+
+// Expects an error as callsbar() was called less than one time.
+assert.throws(
+  () => tracker.verify(),
+  { message: 'Expected the bar function to be executed 1 time(s) but was executed 0 time(s).' }
+);
+callsbar();
+
+// Will throw an error if callsfoo() and callsbar isn't called exactly once.
+tracker.verify();
+
+const callsfoobar = tracker.calls(foo, 1);
+
+callsfoo();
+
+// Expects an error as callsfoo() was called more than once and callsfoobar() was called less than one time.
+assert.throws(
+  () => tracker.verify(),
+  { message: generic_msg }
+);
+
+callsfoobar();
+
+
+// Expects an error as callsfoo() was called more than once
+assert.throws(
+  () => tracker.verify(),
+  { message: 'Expected the foo function to be executed 1 time(s) but was executed 2 time(s).' }
+);