# Environment

The `<Environment>` element defines your target platform environment.

## Attributes

The following **optional** attributes are available:

### `framework`

- The .NET framework in use. SpecFlow+ determines which CLR (Command Language Runtime) version to use to execute the tests based on these setting:

  - `Net5.0` : .NET 5.0 - CLR net50

  - `Net461` : .NET 4.6.1 - CLR 4.0 **(Default)**

  - `Netcoreapp3.1` : .NET Core 3.1 - CLR netcore31

  - `Netcoreapp2.1` : .NET Core 2.1 - CLR netcore21

---

### `platform`

- The target platform architecture: x86, x64 or Default (the setting under **Test &#124; Test Settings &#124; Default Processor Architecture** in Visual Studio).

---

### `testThreadIsolation`

- Determines the level of thread isolation:

  - `Process` : Default for .NET Core and .NET

  - `AppDomain` : Default for .NET Framework, available only in .NET Framework

  - `SharedAppDomain`

---

### `apartmentState`

- Sets the apartment state used to execute the tests:

  - `STA`: Single Threaded Apartment. Use this if your application is not thread-safe.

  - `MTA`: Multi-Threaded Apartment.

  - `Unknown`: The ApartmentState is not set; tests run in same thread as SpecFlow+. **(default)**

> ***Note:**  Setting the `apartmentState` property does not set the test thread apartment state on Linux and OSX. ApartmentStates are not supported on non-Windows systems because COM interop is only available on Windows. Please refer to [Microsoft's documentation](https://docs.microsoft.com/en-us/dotnet/api/system.threading.thread.setapartmentstate?view=net-5.0) for more information.*

---

## Example

Multi-Threaded Apartment with a Process isolation:

```xml
<Environment apartmentState="MTA"  testThreadIsolation="Process"/>
```