adding

LCU.API.Internal.Document/OwnerNumberMigrationTest/TestDoubles/FakeParsingStrategy.cs

@@ -0,0 +1,19 @@
+using OwnerNumberMigration.ValueParsing;
+
+namespace OwnerNumberMigrationTest.TestDoubles;
+
+public class FakeParsingStrategy<T> : IValueParsingStrategy<T>
+{
+    public IDictionary<string, T> Values { get; } = new Dictionary<string, T>();
+
+    private readonly Func<T> _newT;
+
+    public FakeParsingStrategy(Func<T> newT)
+    {
+        this._newT = newT;
+    }
+
+    public T Parse(string value) => Values.TryGetValue(value, out var parsed)
+        ? parsed
+        : _newT();
+}