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265 lines
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<ol class="chapter"><li class="chapter-item expanded "><a href="project-context-primer.html"><strong aria-hidden="true">1.</strong> Project Context Primer</a></li><li class="chapter-item expanded "><a href="what-you-will-learn.html"><strong aria-hidden="true">2.</strong> What You Will Learn</a></li><li class="chapter-item expanded "><a href="quickstart.html"><strong aria-hidden="true">3.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="part-i.html"><strong aria-hidden="true">4.</strong> Part I — Foundations</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="introduction.html" class="active"><strong aria-hidden="true">4.1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="architecture-overview.html"><strong aria-hidden="true">4.2.</strong> Architecture Overview</a></li><li class="chapter-item expanded "><a href="testing-philosophy.html"><strong aria-hidden="true">4.3.</strong> Testing Philosophy</a></li><li class="chapter-item expanded "><a href="scenario-lifecycle.html"><strong aria-hidden="true">4.4.</strong> Scenario Lifecycle</a></li><li class="chapter-item expanded "><a href="design-rationale.html"><strong aria-hidden="true">4.5.</strong> Design Rationale</a></li></ol></li><li class="chapter-item expanded "><a href="part-ii.html"><strong aria-hidden="true">5.</strong> Part II — User Guide</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="workspace-layout.html"><strong aria-hidden="true">5.1.</strong> Workspace Layout</a></li><li class="chapter-item expanded "><a href="annotated-tree.html"><strong aria-hidden="true">5.2.</strong> Annotated Tree</a></li><li class="chapter-item expanded "><a href="authoring-scenarios.html"><strong aria-hidden="true">5.3.</strong> Authoring Scenarios</a></li><li class="chapter-item expanded "><a href="workloads.html"><strong aria-hidden="true">5.4.</strong> Core Content: Workloads & Expectations</a></li><li class="chapter-item expanded "><a href="scenario-builder-ext-patterns.html"><strong aria-hidden="true">5.5.</strong> Core Content: ScenarioBuilderExt Patterns</a></li><li class="chapter-item expanded "><a href="best-practices.html"><strong aria-hidden="true">5.6.</strong> Best Practices</a></li><li class="chapter-item expanded "><a href="usage-patterns.html"><strong aria-hidden="true">5.7.</strong> Usage Patterns</a></li><li class="chapter-item expanded "><a href="examples.html"><strong aria-hidden="true">5.8.</strong> Examples</a></li><li class="chapter-item expanded "><a href="examples-advanced.html"><strong aria-hidden="true">5.9.</strong> Advanced & Artificial Examples</a></li><li class="chapter-item expanded "><a href="cucumber-bdd.html"><strong aria-hidden="true">5.10.</strong> Cucumber/BDD Interface</a></li><li class="chapter-item expanded "><a href="running-scenarios.html"><strong aria-hidden="true">5.11.</strong> Running Scenarios</a></li><li class="chapter-item expanded "><a href="runners.html"><strong aria-hidden="true">5.12.</strong> Runners</a></li><li class="chapter-item expanded "><a href="node-control.html"><strong aria-hidden="true">5.13.</strong> RunContext: BlockFeed & Node Control</a></li><li class="chapter-item expanded "><a href="chaos.html"><strong aria-hidden="true">5.14.</strong> Chaos Workloads</a></li><li class="chapter-item expanded "><a href="topology-chaos.html"><strong aria-hidden="true">5.15.</strong> Topology & Chaos Patterns</a></li></ol></li><li class="chapter-item expanded "><a href="part-iii.html"><strong aria-hidden="true">6.</strong> Part III — Developer Reference</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="scenario-model.html"><strong aria-hidden="true">6.1.</strong> Scenario Model (Developer Level)</a></li><li class="chapter-item expanded "><a href="api-levels.html"><strong aria-hidden="true">6.2.</strong> API Levels: Builder DSL vs. Direct</a></li><li class="chapter-item expanded "><a href="extending.html"><strong aria-hidden="true">6.3.</strong> Extending the Framework</a></li><li class="chap
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<h1 class="menu-title">Logos Blockchain Testing Framework Book</h1>
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<div id="content" class="content">
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<main>
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<h1 id="introduction"><a class="header" href="#introduction">Introduction</a></h1>
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<p>The Logos Testing Framework is a purpose-built toolkit for exercising Logos in
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realistic, multi-node environments. It solves the gap between small, isolated
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tests and full-system validation by letting teams describe a cluster layout,
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drive meaningful traffic, and assert the outcomes in one coherent plan.</p>
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<p>It is for protocol engineers, infrastructure operators, and QA teams who need
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repeatable confidence that validators, executors, and data-availability
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components work together under network and timing constraints.</p>
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<p>Multi-node integration testing is required because many Logos behaviors—block
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progress, data availability, liveness under churn—only emerge when several
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roles interact over real networking and time. This framework makes those checks
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declarative, observable, and portable across environments.</p>
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<h2 id="a-scenario-in-20-lines"><a class="header" href="#a-scenario-in-20-lines">A Scenario in 20 Lines</a></h2>
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<p>Here's the conceptual shape of every test you'll write:</p>
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<pre><code class="language-rust ignore">// 1. Define the cluster
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let scenario = ScenarioBuilder::topology_with(|t| {
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t.network_star()
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.validators(3)
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.executors(2)
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})
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// 2. Add workloads (traffic)
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.transactions_with(|tx| tx.rate(10).users(5))
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.da_with(|da| da.channel_rate(2).blob_rate(2))
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// 3. Define success criteria
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.expect_consensus_liveness()
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// 4. Set experiment duration
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.with_run_duration(Duration::from_secs(60))
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.build();
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// 5. Deploy and run
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let runner = deployer.deploy(&scenario).await?;
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runner.run(&mut scenario).await?;</code></pre>
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<p>This pattern—topology, workloads, expectations, duration—repeats across all scenarios in this book.</p>
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<p><strong>Learn more:</strong> For protocol-level documentation and node internals, see the <a href="https://nomos-tech.notion.site/project">Logos Project Documentation</a>.</p>
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