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Register nowMSTEST0040: Do not assert inside 'async void' contexts
| Property | Value |
|---|---|
| Rule ID | MSTEST0040 |
| Title | Do not assert inside 'async void' contexts |
| Category | Usage |
| Fix is breaking or non-breaking | Non-breaking |
| Enabled by default | Yes |
| Default severity | Warning |
| Introduced in version | 3.8.0 |
| Is there a code fix | No |
The use of any assertion method in an async void method, local function, or lambda.
Exceptions that are thrown in an async void context are unhandled. A failing assertion in an async void method will be swallowed and will not crash the process when using VSTest under .NET Framework. Under .NET, a failing assertion in an async void method might crash the process when using Microsoft.Testing.Platform or VSTest. In cases where a custom SynchronizationContext is present that catches the exception, the failing assertion might be silently swallowed.
Refactor the code to not use assertions in async void.
Do not suppress a warning from this rule.
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