# VersionedAgentSourceContract
> Tracon documentation. Tracon is a .NET package family that adds a control
> plane on Microsoft Agent Framework, published as NuGet packages that run
> inside your own ASP.NET Core application.
>
> Page: https://tracon.dev/api/tracon.testing.contracts.agentsources.versionedagentsourcecontract/
> Summary: VersionedAgentSourceContract: Additional behavior tests for an IVersionedAgentSource.
Namespace Tracon.Testing.Contracts.AgentSources · Assembly Tracon.Testing.Contracts.Xunit.dll
Additional behavior tests for an [IVersionedAgentSource](/api/tracon.iversionedagentsource/).
```csharp
public abstract class VersionedAgentSourceContract : AgentSourceContract, IAsyncLifetime, IAsyncDisposable
```
- Inheritance
- object ← AgentSourceContract ← VersionedAgentSourceContract
- Implements
- IAsyncLifetime, IAsyncDisposable
- Inherited Members
- AgentSourceContract.CreateSourceAsync(), AgentSourceContract.InitializeAsync(), AgentSourceContract.DisposeAsync(), AgentSourceContract.Name_is_not_empty(), AgentSourceContract.Priority_is_stable_across_calls(), AgentSourceContract.Listing_is_repeatable(), AgentSourceContract.Listing_is_safe_under_concurrency(), AgentSourceContract.Resolution_is_safe_under_concurrency(), AgentSourceContract.Listed_names_are_unique_and_valid(), AgentSourceContract.Listed_descriptors_name_the_source(), AgentSourceContract.Known_agent_resolves(), AgentSourceContract.Unknown_agent_returns_null(), AgentSourceContract.Every_listed_agent_resolves(), AgentSourceContract.Resolved_agent_is_listed(), AgentSourceContract.A_pre_cancelled_token_is_honored(), AgentSourceContract.Source, AgentSourceContract.KnownAgentName, AgentSourceContract.UnknownAgentName, object.GetType(), object.MemberwiseClone(), object.ToString(), object.Equals(object?), object.Equals(object?, object?), object.ReferenceEquals(object?, object?), object.GetHashCode()
## Constructors
### VersionedAgentSourceContract\(\)
```csharp
protected VersionedAgentSourceContract()
```
## Properties
### KnownVersion
Gets the version that exists for [AgentSourceContract.KnownAgentName](/api/tracon.testing.contracts.agentsources.agentsourcecontract/#Tracon_Testing_Contracts_AgentSources_AgentSourceContract_KnownAgentName).
```csharp
protected abstract int KnownVersion { get; }
```
#### Property Value
[int](https://learn.microsoft.com/dotnet/api/system.int32)
### UnknownVersion
Gets a version that does not exist for [AgentSourceContract.KnownAgentName](/api/tracon.testing.contracts.agentsources.agentsourcecontract/#Tracon_Testing_Contracts_AgentSources_AgentSourceContract_KnownAgentName).
```csharp
protected virtual int UnknownVersion { get; }
```
#### Property Value
[int](https://learn.microsoft.com/dotnet/api/system.int32)
### VersionedSource
Gets the versioned source under test.
```csharp
protected IVersionedAgentSource VersionedSource { get; }
```
#### Property Value
[IVersionedAgentSource](/api/tracon.iversionedagentsource/)
## Methods
### Known\_version\_resolves\(\)
```csharp
[Fact]
public Task Known_version_resolves()
```
#### Returns
[Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task)
### Unknown\_version\_returns\_null\(\)
```csharp
[Fact]
public Task Unknown_version_returns_null()
```
#### Returns
[Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task)