Typemock has released the latest version of its .NET unit testing mocking tool, Isolator, adding support for .NET 10 and the Visual Studio 2026 Insiders build.
According to the company, this expanded support enables developers to utilize their existing test suites while leveraging the latest .NET features. “Our goal with Isolator 9.4 was to remove friction and give developers complete confidence as they adopt the next generation of .NET without rewriting existing tests or bending their architecture just to make it ‘testable,’” said Eli Lopian, CEO of Typemock.
Another key update in Isolator 9.4 is that SmartRunner now automatically aligns to the same .NET runtime as the test project. SmartRunner is a feature that lets developers know which tests are impacted by changes, so that they can choose to only run those that are relevant and necessary.
The internal architecture selection logic was also improved to create a predictable experience in projects that leverage both x86 and x64 components. The company says that these updates help reduce runtime mismatches, prevent unintended x86 launches, and deliver consistent test behavior across multi-targeted solutions.
Isolator 9.4 also features cleaner installation and uninstallation flows, with more reliable detection of Visual Studio 2026 installations, better documentation for the build pipeline, full cleanup of all directories, and better fallback behavior when probing for components.
Additionally, this release introduces a fully modernized NuGet package structure that includes the README being displayed directly in NuGet, an embedded icon, the license file, simpler TFM mappings, and cleaner dependency groups.
