#26 Add regression test for #26

test/Pose.Tests/RegressionTests.cs

@@ -0,0 +1,32 @@
+using System;
+using FluentAssertions;
+using Xunit;
+using DateTime = System.DateTime;
+
+namespace Pose.Tests
+{
+    public class RegressionTests
+    {
+        private enum TestEnum { A }
+
+        [Fact(DisplayName = "Enum.IsDefined cannot be called from within PoseContext.Isolate #26")]
+        public void Can_call_EnumIsDefined_from_Isolate()
+        {
+            // Arrange
+            var shim = Shim
+                .Replace(() => new DateTime(2024, 2, 2))
+                .With((int year, int month, int day) => new DateTime(2004, 1, 1));
+            var isDefined = false;
+
+            // Act
+            PoseContext.Isolate(
+                () =>
+                {
+                    isDefined = Enum.IsDefined(typeof(TestEnum), nameof(TestEnum.A));
+                }, shim);
+
+            // Assert
+            isDefined.Should().BeTrue(because: "Enum.IsDefined can be called from Isolate");
+        }
+    }
+}