fsharp-testing

Topics in the source

• F# Testing Patterns
• When to Activate
• Test Framework Stack
• Unit Tests with xUnit + FsUnit
• Basic Test Structure
• Assertions with Unquote
• Async Tests
• Parameterized Tests with Theory

Comprehensive testing patterns for F# applications using xUnit, FsUnit, Unquote, FsCheck, and modern .NET testing practices. Writing new tests for F# code Reviewing test quality and coverage Setting up test infrastructure for F# projects Debugging flaky or slow tests | Tool | Purpose | |---|---| | xUnit | Test framework (standard .NET ecosystem choice) | | FsUnit.xUnit | F#-friendly assertion syntax for xUnit | | Unquote | Assertion library using F# quotations for clear failure messages | | FsCheck.xUnit | Property-based testing integrated with xUnit | | NSubstitute | Mocking .NET dependencies | | Testcontainers | Real infrastructure in integration tests | | WebApplicationFactory | ASP.NET Core integration tests | Unquote uses F# quotations so failure messages show the full expression that failed, not just "expected X got Y". | Anti-Pattern | Fix | |---|---| | Testing implementation details | Test behavior and outcomes | | Mutable shared test state | Fresh state per test | | Thread.Sleep in async tests | Use Task.Delay with timeout, or polling helpers | | Asserting on sprintf output | Assert on typed values and pattern matches | | Ignoring CancellationToken | Always pass and verify

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