Rig.TUnit.Observability.Seq 0.1.0-beta.2

This is a prerelease version of Rig.TUnit.Observability.Seq.

dotnet add package Rig.TUnit.Observability.Seq --version 0.1.0-beta.2

NuGet\Install-Package Rig.TUnit.Observability.Seq -Version 0.1.0-beta.2

This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.

<PackageReference Include="Rig.TUnit.Observability.Seq" Version="0.1.0-beta.2" />

For projects that support PackageReference, copy this XML node into the project file to reference the package.

<PackageVersion Include="Rig.TUnit.Observability.Seq" Version="0.1.0-beta.2" />
                    

                            Directory.Packages.props

<PackageReference Include="Rig.TUnit.Observability.Seq" />
                    

                            Project file

For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package.

paket add Rig.TUnit.Observability.Seq --version 0.1.0-beta.2

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

#r "nuget: Rig.TUnit.Observability.Seq, 0.1.0-beta.2"

#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.

#:package Rig.TUnit.Observability.Seq@0.1.0-beta.2

#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package.

#addin nuget:?package=Rig.TUnit.Observability.Seq&version=0.1.0-beta.2&prerelease
                    

                            Install as a Cake Addin

#tool nuget:?package=Rig.TUnit.Observability.Seq&version=0.1.0-beta.2&prerelease
                    

                            Install as a Cake Tool

The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Rig.TUnit.Observability.Seq

Testcontainers-backed Seq server with Serilog sink — logs land in a real Seq instance; SeqAssert.Query(…).Count(N).Within(…) for fluent query-based verification.

What this package is

Boots a datalust/seq Testcontainer and wires a Serilog Seq sink so logs emitted through the fixture's ILoggerFactory actually land in Seq. Tests then assert via Seq's query language: SeqAssert.Query(fx, "Level=@Warning").Count(1).Within(10s). CaptureDashboardSnapshotAsync writes a .txt artefact to TestResults/seq-dashboards/ with the Seq URL and metadata for post-failure inspection.

When to use it

Integration tests where Serilog-structured logs matter end-to-end.
Regression-testing a Serilog configuration under real ingestion.
Producing failure-artefact URLs pointing into Seq for triage.
Not for: unit tests — use Rig.TUnit.Observability.Logging for in-memory capture.

Prerequisites

.NET 10 SDK
Docker Desktop / Colima (Seq image ~250 MB)
Serilog + Serilog.Sinks.Seq (transitive)

Quick start

using Microsoft.Extensions.Logging;
using Rig.TUnit.Observability.Seq.Fixtures;
using Rig.TUnit.Observability.Seq.Options;

await using var fx = new SeqFixture(new SeqFixtureOptions { ImageTag = "latest" });
await fx.InitializeAsync();

fx.Factory.CreateLogger("T").LogWarning("Disk low {Free}", 100);

Options

Property	Type	Default	Description
`ImageTag`	`string`	`"latest"`	Seq image tag
`StartupTimeoutSeconds`	`int`	`60`	Seq boot window
`AcceptEula`	`bool`	`true`	Seq EULA acceptance
`MinimumLevel`	`string`	`"Information"`	Serilog filter

Fixture + helper APIs

Rig.TUnit.Observability.Seq.Fixtures.SeqFixture
Rig.TUnit.Observability.Seq.Options.SeqFixtureOptions
Rig.TUnit.Observability.Seq.Builder.SeqRigBuilder
Rig.TUnit.Observability.Seq.Assertions.SeqAssert

Per-test isolation

Each fixture runs its own Seq container — no cross-test data bleed. Logs include ServiceName = rigtunit-{IsolationKey} so multiple parallel Seq instances stay distinct.

Parallelism + performance

First-run pull: ~30 s.
Warm startup: ~5 s.
Per-log overhead: ~3–5 ms (Serilog batching typically hides this).
Parallelism: limited by container cost; 2–4 concurrent fixtures typical.

Troubleshooting

SeqAssert.Query(…).Count(1) times out — Seq is eventually consistent for index builds; default Within is 10 s, which is usually enough. Raise for heavy load.
Dashboard snapshot missing — CaptureDashboardSnapshotAsync writes to TestResults/seq-dashboards/{testName}.txt; ensure the test runner's working directory is the project root.

See docs/troubleshooting.md#seq.

Provider quirks + edge cases

Seq query language is its own DSL — Level=@Warning, OrderId=42; see Seq docs for the full grammar.
The container's admin password is randomised per fixture; API keys are pre-created by the fixture so tests don't deal with auth.

Benchmarks

See SeqBenchmarks.cs; baseline in benchmarks/baseline-005.json.

License

MIT. See LICENSE.

Product	Compatible and additional computed target framework versions.
.NET	net10.0 is compatible. net10.0-android was computed. net10.0-browser was computed. net10.0-ios was computed. net10.0-maccatalyst was computed. net10.0-macos was computed. net10.0-tvos was computed. net10.0-windows was computed.

Compatible target framework(s)

Included target framework(s) (in package)

Learn more about Target Frameworks and .NET Standard.

net10.0
- Bogus (>= 35.6.1)
- Microsoft.Extensions.Configuration (>= 10.0.0)
- Microsoft.Extensions.Configuration.Binder (>= 10.0.0)
- Microsoft.Extensions.DependencyInjection (>= 10.0.0)
- Microsoft.Extensions.DependencyInjection.Abstractions (>= 10.0.0)
- Microsoft.Extensions.Logging (>= 10.0.0)
- Microsoft.Extensions.Logging.Abstractions (>= 10.0.0)
- Microsoft.Extensions.Options (>= 10.0.0)
- Microsoft.Extensions.Options.DataAnnotations (>= 10.0.0)
- Rig.TUnit.Observability (>= 0.1.0-beta.2)
- Serilog (>= 4.2.0)
- Serilog.Extensions.Logging (>= 9.0.0)
- Serilog.Sinks.Seq (>= 8.0.0)
- Testcontainers (>= 4.11.0)
- TUnit.Core (>= 1.34.5)

NuGet packages (2)

Showing the top 2 NuGet packages that depend on Rig.TUnit.Observability.Seq:

Package	Downloads
Rig.TUnit.All Meta-package containing every Rig.TUnit.* package. DISCOURAGED — prefer per-feature or per-stack meta-packages (Rig.TUnit, Rig.TUnit.Microservices).	87
Rig.TUnit.Microservices Meta-package: Core + Mediator + Grpc + Outbox + Tracing + Jwt + Seq — the opinionated microservice testing kit.	79

GitHub repositories

This package is not used by any popular GitHub repositories.

Version	Downloads	Last Updated
0.1.0-beta.2	42	4/27/2026
0.0.0-alpha.0.14	49	4/26/2026