Use a time keeper to get the actual backtest/like date in SIDs generation

Use correct current date to query map file to generate equity SIDs

Algorithm.CSharp/OptionAssignmentMappingTestAlgorithm.cs

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+/*
+ * 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.Collections.Generic;
+using QuantConnect.Data;
+using QuantConnect.Securities.Option;
+
+namespace QuantConnect.Algorithm.CSharp
+{
+    /// <summary>
+    /// Test algorithm to assert we receive option chains for the canonical option symbol.
+    /// This algorithm will be used to run a unit test instead of a regression test, and
+    /// it will be used to assert the correct underlying SID is generated with the correct date
+    /// for the backtest current date.
+    /// </summary>
+    public class OptionAssignmentMappingTestAlgorithm : OptionAssignmentRegressionAlgorithm
+    {
+        private bool _chainsChecked;
+
+        private Option _canonicalOption;
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            _canonicalOption = AddOption(Stock.Symbol, Resolution.Minute);
+        }
+
+        public override void OnData(Slice slice)
+        {
+            base.OnData(slice);
+
+            if (slice.OptionChains.TryGetValue(_canonicalOption.Symbol, out var chain) && chain.Count > 0)
+            {
+                _chainsChecked = true;
+            }
+        }
+
+        public override void OnEndOfAlgorithm()
+        {
+            base.OnEndOfAlgorithm();
+
+            if (!_chainsChecked)
+            {
+                throw new RegressionTestException("No options chains received");
+            }
+        }
+
+        /// <summary>
+        /// This is used by the regression test system to indicate if the open source Lean repository has the required data to run this algorithm.
+        /// </summary>
+        public override bool CanRunLocally { get; } = false;
+
+        /// <summary>
+        /// This is used by the regression test system to indicate which languages this algorithm is written in.
+        /// </summary>
+        public override List<Language> Languages { get; } = new() { Language.CSharp };
+    }
+}