aspire-integration-testing: Coding Workflows for AI Agents | OpenAgentSkill

Overview

Write integration tests using .NET Aspire's testing facilities with xUnit. Covers test fixtures, distributed application setup, endpoint discovery, and patterns for testing ASP.NET Core apps with real dependencies.

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Integration Testing with .NET Aspire + xUnit

When to Use This Skill

Use this skill when:

Writing integration tests for .NET Aspire applications
Testing ASP.NET Core apps with real database connections
Verifying service-to-service communication in distributed applications
Testing with actual infrastructure (SQL Server, Redis, message queues) in containers
Combining Playwright UI tests with Aspire-orchestrated services
Testing microservices with proper service discovery and networking

Reference Files

advanced-patterns.md: Endpoint discovery, database testing, Playwright, conditional config, Respawn, service communication, message queues
ci-and-tooling.md: CI/CD integration, custom resource waiters, Aspire CLI with MCP

Core Principles

Real Dependencies - Use actual infrastructure (databases, caches) via Aspire, not mocks
Dynamic Port Binding - Let Aspire assign ports dynamically (127.0.0.1:0) to avoid conflicts
Fixture Lifecycle - Use IAsyncLifetime for proper test fixture setup and teardown
Endpoint Discovery - Never hard-code URLs; discover endpoints from Aspire at runtime
Parallel Isolation - Use xUnit collections to control test parallelization
Health Checks - Always wait for services to be healthy before running tests

High-Level Testing Architecture

┌─────────────────┐                    ┌──────────────────────┐
│ xUnit test file │──uses────────────►│  AspireFixture       │
└─────────────────┘                    │  (IAsyncLifetime)    │
                                       └──────────────────────┘
                                               │
                                               │ starts
                                               ▼
                                    ┌───────────────────────────┐
                                    │  DistributedApplication   │
                                    │  (from AppHost)           │
                                    └───────────────────────────┘
                                               │ exposes
                                               ▼
                                  ┌──────────────────────────────┐
                                  │   Dynamic HTTP Endpoints     │
                                  └──────────────────────────────┘
                                               │ consumed by
                                               ▼
                                   ┌─────────────────────────┐
                                   │  HttpClient / Playwright│
                                   └─────────────────────────┘

Required NuGet Packages

<ItemGroup>
  <PackageReference Include="Aspire.Hosting.Testing" Version="$(AspireVersion)" />
  <PackageReference Include="xunit" Version="*" />
  <PackageReference Include="xunit.runner.visualstudio" Version="*" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="*" />
</ItemGroup>

CRITICAL: File Watcher Fix for Integration Tests

When running many integration tests that each start an IHost, the default .NET host builder enables file watchers for configuration reload. This exhausts file descriptor limits on Linux.

Add this to your test project before any tests run:

// TestEnvironmentInitializer.cs
using System.Runtime.CompilerServices;

namespace YourApp.Tests;

internal static class TestEnvironmentInitializer
{
    [ModuleInitializer]
    internal static void Initialize()
    {
        // Disable config file watching in test hosts
        // Prevents file descriptor exhaustion (inotify watch limit) on Linux
        Environment.SetEnvironmentVariable("DOTNET_HOSTBUILDER__RELOADCONFIGONCHANGE", "false");
    }
}

Pattern 1: Basic Aspire Test Fixture (Modern API)

using Aspire.Hosting;
using Aspire.Hosting.Testing;

public sealed class AspireAppFixture : IAsyncLifetime
{
    private DistributedApplication? _app;

    public DistributedApplication App => _app
        ?? throw new InvalidOperationException("App not initialized");

    public async Task InitializeAsync()
    {
        var builder = await DistributedApplicationTestingBuilder
            .CreateAsync<Projects.YourApp_AppHost>([
                "YourApp:UseVolumes=false",
                "YourApp:Environment=IntegrationTest",
                "YourApp:Replicas=1"
            ]);

        _app = await builder.BuildAsync();

        using var startupCts = new CancellationTokenSource(TimeSpan.FromMinutes(10));
        await _app.StartAsync(startupCts.Token);

        using var healthCts = new CancellationTokenSource(TimeSpan.FromMinutes(5));
        await _app.ResourceNotifications.WaitForResourceHealthyAsync("api", healthCts.Token);
    }

    public Uri GetEndpoint(string resourceName, string scheme = "https")
    {
        return _app?.GetEndpoint(resourceName, scheme)
            ?? throw new InvalidOperationException($"Endpoint for '{resourceName}' not found");
    }

    public async Task DisposeAsync()
    {
        if (_app is not null)
        {
            await _app.DisposeAsync();
        }
    }
}

Pattern 2: Using the Fixture in Tests

[CollectionDefinition("Aspire collection")]
public class AspireCollection : ICollectionFixture<AspireAppFixture> { }

[Collection("Aspire collection")]
public class IntegrationTests
{
    private readonly AspireAppFixture _fixture;

    public IntegrationTests(AspireAppFixture fixture)
    {
        _fixture = fixture;
    }

    [Fact]
    public async Task Application_ShouldStart()
    {
        var httpClient = _fixture.App.CreateHttpClient("yourapp");
        var response = await httpClient.GetAsync("/");
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
    }
}

See advanced-patterns.md for Endpoint Discovery, Database Testing, Playwright UI Tests, Conditional Resource Configuration, Respawn database reset, Service-to-Service Communication, and Message Queue testing patterns.

Common Patterns Summary

Pattern	Use Case
Basic Fixture	Simple HTTP endpoint testing
Endpoint Discovery	Avoid hard-coded URLs
Database Testing	Verify data access layer
Playwright Integration	Full UI testing with real backend
Configuration Override	Test-specific settings
Health Checks	Ensure services are ready
Service Communication	Test distributed system interactions
Message Queue Testing	Verify async messaging

Tricky / Non-Obvious Tips

Problem	Solution
Tests timeout immediately	Call `await _app.StartAsync()` and wait for services to be healthy
Port conflicts between tests	Use xUnit `CollectionDefinition` to share fixtures
Flaky tests due to timing	Implement proper health check polling instead of `Task.Delay()`
Can't connect to SQL Server	Retrieve connection string dynamically via `GetConnectionStringAsync()`
Parallel tests interfere	Use `[Collection]` attribute to run related tests sequentially
Aspire dashboard conflicts	Only one dashboard can run at a time; tests reuse the same instance

Best Practices

Use IAsyncLifetime - Ensures proper async initialization and cleanup
Share fixtures via collections - Reduces test execution time by reusing app instances
Discover endpoints dynamically - Never hard-code localhost:5000 or similar
Wait for health checks - Don't assume services are immediately ready
Test with real dependencies - Aspire makes it easy to use real SQL, Redis, etc.
Clean up resources - Always implement DisposeAsync properly
Use meaningful test data - Seed databases with realistic test data
Test failure scenarios - Verify error handling and resilience
Keep tests isolated - Each test should be independent and order-agnostic
Monitor test execution time - If tests are slow, consider parallelization

See ci-and-tooling.md for GitHub Actions setup, custom resource waiters, and Aspire CLI/MCP integration.

Debugging Tips

Run Aspire Dashboard - When tests fail, check the dashboard at http://localhost:15888
Use Aspire CLI with MCP - Let AI assistants query real application state
Enable detailed logging - Set ASPIRE_ALLOW_UNSECURED_TRANSPORT=true for more verbose output
Check container logs - Use docker logs to inspect container output
Use breakpoints in fixtures - Debug fixture initialization to catch startup issues
Verify resource names - Ensure resource names match between AppHost and tests

View source ↗

File metadata

name: aspire-integration-testing
description: Write integration tests using .NET Aspire's testing facilities with xUnit. Covers test fixtures, distributed application setup, endpoint discovery, and patterns for testing ASP.NET Core apps with real dependencies.
invocable: false

View original text

---
name: aspire-integration-testing
description: Write integration tests using .NET Aspire's testing facilities with xUnit. Covers test fixtures, distributed application setup, endpoint discovery, and patterns for testing ASP.NET Core apps with real dependencies.
invocable: false
---

# Integration Testing with .NET Aspire + xUnit

## When to Use This Skill

Use this skill when:
- Writing integration tests for .NET Aspire applications
- Testing ASP.NET Core apps with real database connections
- Verifying service-to-service communication in distributed applications
- Testing with actual infrastructure (SQL Server, Redis, message queues) in containers
- Combining Playwright UI tests with Aspire-orchestrated services
- Testing microservices with proper service discovery and networking

## Reference Files

- [advanced-patterns.md](advanced-patterns.md): Endpoint discovery, database testing, Playwright, conditional config, Respawn, service communication, message queues
- [ci-and-tooling.md](ci-and-tooling.md): CI/CD integration, custom resource waiters, Aspire CLI with MCP

## Core Principles

1. **Real Dependencies** - Use actual infrastructure (databases, caches) via Aspire, not mocks
2. **Dynamic Port Binding** - Let Aspire assign ports dynamically (`127.0.0.1:0`) to avoid conflicts
3. **Fixture Lifecycle** - Use `IAsyncLifetime` for proper test fixture setup and teardown
4. **Endpoint Discovery** - Never hard-code URLs; discover endpoints from Aspire at runtime
5. **Parallel Isolation** - Use xUnit collections to control test parallelization
6. **Health Checks** - Always wait for services to be healthy before running tests

## High-Level Testing Architecture

```
┌─────────────────┐                    ┌──────────────────────┐
│ xUnit test file │──uses────────────►│  AspireFixture       │
└─────────────────┘                    │  (IAsyncLifetime)    │
                                       └──────────────────────┘
                                               │
                                               │ starts
                                               ▼
                                    ┌───────────────────────────┐
                                    │  DistributedApplication   │
                                    │  (from AppHost)           │
                                    └───────────────────────────┘
                                               │ exposes
                                               ▼
                                  ┌──────────────────────────────┐
                                  │   Dynamic HTTP Endpoints     │
                                  └──────────────────────────────┘
                                               │ consumed by
                                               ▼
                                   ┌─────────────────────────┐
                                   │  HttpClient / Playwright│
                                   └─────────────────────────┘
```

## Required NuGet Packages

```xml
<ItemGroup>
  <PackageReference Include="Aspire.Hosting.Testing" Version="$(AspireVersion)" />
  <PackageReference Include="xunit" Version="*" />
  <PackageReference Include="xunit.runner.visualstudio" Version="*" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="*" />
</ItemGroup>
```

## CRITICAL: File Watcher Fix for Integration Tests

When running many integration tests that each start an IHost, the default .NET host builder enables file watchers for configuration reload. This exhausts file descriptor limits on Linux.

**Add this to your test project before any tests run:**

```csharp
// TestEnvironmentInitializer.cs
using System.Runtime.CompilerServices;

namespace YourApp.Tests;

internal static class TestEnvironmentInitializer
{
    [ModuleInitializer]
    internal static void Initialize()
    {
        // Disable config file watching in test hosts
        // Prevents file descriptor exhaustion (inotify watch limit) on Linux
        Environment.SetEnvironmentVariable("DOTNET_HOSTBUILDER__RELOADCONFIGONCHANGE", "false");
    }
}
```

## Pattern 1: Basic Aspire Test Fixture (Modern API)

```csharp
using Aspire.Hosting;
using Aspire.Hosting.Testing;

public sealed class AspireAppFixture : IAsyncLifetime
{
    private DistributedApplication? _app;

    public DistributedApplication App => _app
        ?? throw new InvalidOperationException("App not initialized");

    public async Task InitializeAsync()
    {
        var builder = await DistributedApplicationTestingBuilder
            .CreateAsync<Projects.YourApp_AppHost>([
                "YourApp:UseVolumes=false",
                "YourApp:Environment=IntegrationTest",
                "YourApp:Replicas=1"
            ]);

        _app = await builder.BuildAsync();

        using var startupCts = new CancellationTokenSource(TimeSpan.FromMinutes(10));
        await _app.StartAsync(startupCts.Token);

        using var healthCts = new CancellationTokenSource(TimeSpan.FromMinutes(5));
        await _app.ResourceNotifications.WaitForResourceHealthyAsync("api", healthCts.Token);
    }

    public Uri GetEndpoint(string resourceName, string scheme = "https")
    {
        return _app?.GetEndpoint(resourceName, scheme)
            ?? throw new InvalidOperationException($"Endpoint for '{resourceName}' not found");
    }

    public async Task DisposeAsync()
    {
        if (_app is not null)
        {
            await _app.DisposeAsync();
        }
    }
}
```

## Pattern 2: Using the Fixture in Tests

```csharp
[CollectionDefinition("Aspire collection")]
public class AspireCollection : ICollectionFixture<AspireAppFixture> { }

[Collection("Aspire collection")]
public class IntegrationTests
{
    private readonly AspireAppFixture _fixture;

    public IntegrationTests(AspireAppFixture fixture)
    {
        _fixture = fixture;
    }

    [Fact]
    public async Task Application_ShouldStart()
    {
        var httpClient = _fixture.App.CreateHttpClient("yourapp");
        var response = await httpClient.GetAsync("/");
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
    }
}
```

See [advanced-patterns.md](advanced-patterns.md) for Endpoint Discovery, Database Testing, Playwright UI Tests, Conditional Resource Configuration, Respawn database reset, Service-to-Service Communication, and Message Queue testing patterns.

## Common Patterns Summary

| Pattern | Use Case |
|---------|----------|
| Basic Fixture | Simple HTTP endpoint testing |
| Endpoint Discovery | Avoid hard-coded URLs |
| Database Testing | Verify data access layer |
| Playwright Integration | Full UI testing with real backend |
| Configuration Override | Test-specific settings |
| Health Checks | Ensure services are ready |
| Service Communication | Test distributed system interactions |
| Message Queue Testing | Verify async messaging |

## Tricky / Non-Obvious Tips

| Problem | Solution |
|---------|----------|
| Tests timeout immediately | Call `await _app.StartAsync()` and wait for services to be healthy |
| Port conflicts between tests | Use xUnit `CollectionDefinition` to share fixtures |
| Flaky tests due to timing | Implement proper health check polling instead of `Task.Delay()` |
| Can't connect to SQL Server | Retrieve connection string dynamically via `GetConnectionStringAsync()` |
| Parallel tests interfere | Use `[Collection]` attribute to run related tests sequentially |
| Aspire dashboard conflicts | Only one dashboard can run at a time; tests reuse the same instance |

## Best Practices

1. **Use `IAsyncLifetime`** - Ensures proper async initialization and cleanup
2. **Share fixtures via collections** - Reduces test execution time by reusing app instances
3. **Discover endpoints dynamically** - Never hard-code localhost:5000 or similar
4. **Wait for health checks** - Don't assume services are immediately ready
5. **Test with real dependencies** - Aspire makes it easy to use real SQL, Redis, etc.
6. **Clean up resources** - Always implement `DisposeAsync` properly
7. **Use meaningful test data** - Seed databases with realistic test data
8. **Test failure scenarios** - Verify error handling and resilience
9. **Keep tests isolated** - Each test should be independent and order-agnostic
10. **Monitor test execution time** - If tests are slow, consider parallelization

See [ci-and-tooling.md](ci-and-tooling.md) for GitHub Actions setup, custom resource waiters, and Aspire CLI/MCP integration.

---

## Debugging Tips

1. **Run Aspire Dashboard** - When tests fail, check the dashboard at `http://localhost:15888`
2. **Use Aspire CLI with MCP** - Let AI assistants query real application state
3. **Enable detailed logging** - Set `ASPIRE_ALLOW_UNSECURED_TRANSPORT=true` for more verbose output
4. **Check container logs** - Use `docker logs` to inspect container output
5. **Use breakpoints in fixtures** - Debug fixture initialization to catch startup issues
6. **Verify resource names** - Ensure resource names match between AppHost and tests

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Source repository: Aaronontheweb/dotnet-skills
License: MIT
Version: 1.0.0
Last GitHub push: Aug 7, 2026
Registry updated: Sep 2, 2026
Instruction path: skills/aspire-integration-testing/SKILL.md @ 13e26d39ed01

Version reported in registry metadata; check source releases before relying on it.

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    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 74,
    "label": "Strong"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Coding agents",
    "maintenance": "1mo since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "high-compliance environments without internal security review",
    "No major risk signals from current metadata",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "Quality score needs review",
    "Permission surface needs review: secrets or environment access, shell or command execution"
  ],
  "agent_contract": {
    "task_input": "Use aspire-integration-testing in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 72/100 Strong shortlist",
      "Audit: 77/100 Needs review",
      "Safety: 29/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "aaronontheweb-aspire-integration-testing (aspire-integration-testing)",
      "install_command": "npx skills add Aaronontheweb/dotnet-skills --skill aspire-integration-testing",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "aaronontheweb-aspire-integration-testing",
      "task": "Use aspire-integration-testing in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/aaronontheweb-aspire-integration-testing",
    "api": "https://www.openagentskill.com/api/agent/skills/aaronontheweb-aspire-integration-testing",
    "audit": "https://www.openagentskill.com/skills/aaronontheweb-aspire-integration-testing/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=aaronontheweb-aspire-integration-testing&task=Use%20aspire-integration-testing%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20aspire-integration-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20aspire-integration-testing%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/aaronontheweb-aspire-integration-testing/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/aaronontheweb-aspire-integration-testing"
  }
}

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Creator: Aaronontheweb
Source: Aaronontheweb/dotnet-skills
Indexed by: OpenAgentSkill community index

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