Fix test

Author: hadashiA

src/MemoryPack.Generator/MemoryPackGenerator.Emitter.cs

@@ -927,16 +927,11 @@ string EmitDeserializeConstructionWithBranching(string indent)
             .Select((x, i) => (x, i))
             .Where(v => v.x.SuppressDefaultInitialization);
 
-        if (GenerateType is GenerateType.VersionTolerant or GenerateType.CircularReference)
-        {
-            return members
-                .Select(v => $"{indent}if (deltas[{v.i}] != 0) value.@{v.x.Name} = __{v.x.Name};")
-                .NewLine();
-        }
+        var lines = GenerateType is GenerateType.VersionTolerant or GenerateType.CircularReference
+            ? members.Select(v => $"{indent}if (deltas.Length > {v.i} && deltas[{v.i}] != 0) value.@{v.x.Name} = __{v.x.Name};")
+            : members.Select(v => $"{indent}if ({v.i + 1} <= count) value.@{v.x.Name} = __{v.x.Name};");
 
-        return members
-            .Select(v => $"{indent}if ({v.i + 1} <= count) value.@{v.x.Name} = __{v.x.Name};")
-            .NewLine();
+        return lines.NewLine();
     }
 
     string EmitUnionTemplate(IGeneratorContext context)

tests/MemoryPack.Tests/DefaultValueTest.cs

@@ -19,11 +19,11 @@ public void SuppressDefaultInitialization()
     [Fact]
     public void SuppressDefaultInitialization_VersionTolerant()
     {
-        var bin = MemoryPackSerializer.Serialize(new DefaultValuePlaceholder { X = 1 });
+        var bin = MemoryPackSerializer.Serialize(new DefaultValuePlaceholderWithVersionTolerant { X = 1 });
         var expected = new HasDefaultValueWithVersionTolerant();
         var deserializedValue = MemoryPackSerializer.Deserialize<HasDefaultValueWithVersionTolerant>(bin)!;
         deserializedValue.Y.Should().Be(default);
-        deserializedValue.Z.Should().Be(expected.Z);
+        deserializedValue.Z.Should().Be(default);
         deserializedValue.Y2.Should().Be(expected.Y2);
         deserializedValue.Z2.Should().Be(expected.Z2);
     }

tests/MemoryPack.Tests/Models/DefaultValues.cs

@@ -6,6 +6,12 @@ partial class DefaultValuePlaceholder
     public int X { get; set; }
 }
 
+[MemoryPackable(GenerateType.VersionTolerant, SerializeLayout.Sequential)]
+partial class DefaultValuePlaceholderWithVersionTolerant
+{
+    public int X { get; set; }
+}
+
 [MemoryPackable(GenerateType.VersionTolerant, SerializeLayout.Sequential)]
 partial class HasDefaultValueWithVersionTolerant
 {