# CopierTester<TValue, TCopier>.CopierTester<TValue, TCopier>(ITestOutputHelper, SerializationTesterFixture)

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.serialization.testkit/orleans.serialization.testkit.copiertester-2/) | [Constructors](/orleans/docs/api/csharp/microsoft.orleans.serialization.testkit/orleans.serialization.testkit.copiertester-2/constructors/)

[Source](https://github.com/dotnet/orleans/blob/1644940b035c7bdf215a4fd7135757c06bcfe9ec/src/Orleans.Serialization.TestKit/CopierTester.cs#L38-L41)

```csharp
protected CopierTester<TValue, CopierTester(ITestOutputHelper output, SerializationTesterFixture fixture)
```

Initializes a new `Orleans.Serialization.TestKit.CopierTester-2` instance.

### Parameters

- `output` (`ITestOutputHelper`)
- `fixture` (`SerializationTesterFixture`)

### Exceptions

- `System.ArgumentNullException`: `output` or `fixture` is `null`.