chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,47 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+using System;
+using NUnit.Framework;
+using QuantConnect.Lean.Engine.DataFeeds;
+
+namespace QuantConnect.Tests.Engine.DataFeeds
+{
+    [TestFixture]
+    public class PredicateTimeProviderTests
+    {
+        [Test]
+        public void RespectsCustomStepEvaluator()
+        {
+            var startTime = new DateTime(2018, 1, 1);
+            var manualTimeProvider = new ManualTimeProvider(startTime);
+            var stepTimeProvider = new PredicateTimeProvider(manualTimeProvider,
+                // only step when minute is a pair number
+                time => time.Minute % 2 == 0);
+
+            Assert.AreEqual(manualTimeProvider.GetUtcNow(), stepTimeProvider.GetUtcNow());
+
+            manualTimeProvider.AdvanceSeconds(45 * 60); // advance 45 minutes, past the interval
+
+            // still the same because 45 minutes isn't pair
+            Assert.AreEqual(startTime, stepTimeProvider.GetUtcNow());
+            Assert.AreNotEqual(manualTimeProvider.GetUtcNow(), stepTimeProvider.GetUtcNow());
+
+            manualTimeProvider.AdvanceSeconds(60);
+            Assert.AreEqual(manualTimeProvider.GetUtcNow(), stepTimeProvider.GetUtcNow());
+        }
+    }
+}