diff --git a/TUnit.TestProject/Bugs/3171/Tests.cs b/TUnit.TestProject/Bugs/3171/Tests.cs
new file mode 100644
index 0000000000..e824dce5af
--- /dev/null
+++ b/TUnit.TestProject/Bugs/3171/Tests.cs
@@ -0,0 +1,64 @@
+using TUnit.TestProject.Attributes;
+
+namespace TUnit.TestProject.Bugs._3171;
+
+[EngineTest(ExpectedResult.Pass)]
+public class Tests
+{
+    [Test]
+    [Arguments(null, 0d, 0d)]
+    [Arguments(null, 12d, 12d)]
+    [Arguments(false, 42d, 0d)]
+    [Arguments(true, 42d, 1d)]
+    [Arguments(0, 42d, 0d)]
+    [Arguments(1, 42d, 1d)]
+    [Arguments(42, 0d, 42d)]
+    [Arguments(-1, 0d, -1d)]
+    [Arguments(0L, 42d, 0d)]
+    [Arguments(1L, 42d, 1d)]
+    [Arguments(42L, 0d, 42d)]
+    [Arguments(-1L, 0d, -1d)]
+    [Arguments(0d, 42d, 0d)]
+    [Arguments(1d, 42d, 1d)]
+    [Arguments(42d, 0d, 42d)]
+    [Arguments(-1d, 0d, -1d)]
+    [Arguments(3.5d, 0d, 3.5d)]
+    [Arguments(-3.14d, 0d, -3.14d)]
+    [Arguments("123", 42d, 123d)]
+    [Arguments("-1", 42d, -1d)]
+    [Arguments("3.14", 42d, 3.14d)]
+    [Arguments("-1.02", 42d, -1.02d)]
+    public void DoubleConversion(object? input, double nullValue, double expected)
+    { }
+
+    [Test]
+    [Arguments(null, Flags.Value1, Flags.Value1)]
+    [Arguments(null, Flags.Value2, Flags.Value2)]
+    [Arguments(null, Flags.Value1 | Flags.Value2, Flags.Value1 | Flags.Value2)]
+    [Arguments(null, Flags.Max, Flags.Max)]
+    [Arguments("0", Flags.Max, (Flags)0)]
+    [Arguments("1", Flags.Max, Flags.Value1)]
+    [Arguments("2", Flags.Max, Flags.Value2)]
+    [Arguments("3", Flags.Max, (Flags)3)]
+    [Arguments("4", Flags.Max, Flags.Value3)]
+    [Arguments("Value1", Flags.Max, Flags.Value1)]
+    [Arguments("Value2", Flags.Max, Flags.Value2)]
+    [Arguments("value1", Flags.Max, Flags.Value1)]
+    [Arguments("value2", Flags.Max, Flags.Value2)]
+    [Arguments("Value1,Value2", Flags.Max, Flags.Value1 | Flags.Value2)]
+    [Arguments("value1, value2", Flags.Max, Flags.Value1 | Flags.Value2)]
+    [Arguments(Flags.Value1, Flags.Max, Flags.Value1)]
+    [Arguments(Flags.Value2, Flags.Max, Flags.Value2)]
+    [Arguments(Flags.Max, (Flags)0, Flags.Max)]
+    public void FlagsEnumConversion(object? input, Flags nullValue, Flags expected)
+    { }
+}
+
+[Flags]
+public enum Flags : byte
+{
+    Value1 = 1 << 0,
+    Value2 = 1 << 1,
+    Value3 = 1 << 2,
+    Max = 255,
+}