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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"><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" class="active"><strong aria-hidden="true">4.3.</strong> Testing Philosophy</a></li><li 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<main>
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<h1 id="testing-philosophy"><a class="header" href="#testing-philosophy">Testing Philosophy</a></h1>
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<p>This framework embodies specific principles that shape how you author and run
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scenarios. Understanding these principles helps you write effective tests and
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interpret results correctly.</p>
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<h2 id="declarative-over-imperative"><a class="header" href="#declarative-over-imperative">Declarative over Imperative</a></h2>
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<p>Describe <strong>what</strong> you want to test, not <strong>how</strong> to orchestrate it:</p>
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<pre><code class="language-rust ignore">use testing_framework_core::scenario::ScenarioBuilder;
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use testing_framework_workflows::ScenarioBuilderExt;
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pub fn declarative_over_imperative() {
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// Good: declarative
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let _plan = ScenarioBuilder::topology_with(|t| t.network_star().validators(2).executors(1))
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.transactions_with(|txs| {
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txs.rate(5) // 5 transactions per block
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})
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.expect_consensus_liveness()
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.build();
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// Bad: imperative (framework doesn't work this way)
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// spawn_validator(); spawn_executor();
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// loop { submit_tx(); check_block(); }
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}</code></pre>
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<p><strong>Why it matters:</strong> The framework handles deployment, readiness, and cleanup.
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You focus on test intent, not infrastructure orchestration.</p>
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<h2 id="protocol-time-not-wall-time"><a class="header" href="#protocol-time-not-wall-time">Protocol Time, Not Wall Time</a></h2>
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<p>Reason in <strong>blocks</strong> and <strong>consensus intervals</strong>, not wall-clock seconds.</p>
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<p><strong>Consensus defaults:</strong></p>
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<ul>
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<li>Slot duration: 2 seconds (NTP-synchronized, configurable via <code>CONSENSUS_SLOT_TIME</code>)</li>
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<li>Active slot coefficient: 0.9 (90% block probability per slot, configurable via <code>CONSENSUS_ACTIVE_SLOT_COEFF</code>)</li>
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<li>Expected rate: ~27 blocks per minute</li>
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</ul>
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<pre><code class="language-rust ignore">use std::time::Duration;
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use testing_framework_core::scenario::ScenarioBuilder;
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use testing_framework_workflows::ScenarioBuilderExt;
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pub fn protocol_time_not_wall_time() {
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// Good: protocol-oriented thinking
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let _plan = ScenarioBuilder::topology_with(|t| t.network_star().validators(2).executors(1))
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.transactions_with(|txs| {
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txs.rate(5) // 5 transactions per block
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})
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.with_run_duration(Duration::from_secs(60)) // Let framework calculate expected blocks
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.expect_consensus_liveness() // "Did we produce the expected blocks?"
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.build();
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// Bad: wall-clock assumptions
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// "I expect exactly 30 blocks in 60 seconds"
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// This breaks on slow CI where slot timing might drift
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}</code></pre>
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<p><strong>Why it matters:</strong> Slot timing is fixed (2s by default, NTP-synchronized), so the
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expected number of blocks is predictable: ~27 blocks in 60s with the default
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0.9 active slot coefficient. The framework calculates expected blocks from slot
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duration and run window, making assertions protocol-based rather than tied to
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specific wall-clock expectations. Assert on "blocks produced relative to slots"
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not "blocks produced in exact wall-clock seconds".</p>
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<h2 id="determinism-first-chaos-when-needed"><a class="header" href="#determinism-first-chaos-when-needed">Determinism First, Chaos When Needed</a></h2>
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<p><strong>Default scenarios are repeatable:</strong></p>
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<ul>
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<li>Fixed topology</li>
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<li>Predictable traffic rates</li>
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<li>Deterministic checks</li>
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</ul>
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<p><strong>Chaos is opt-in:</strong></p>
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<pre><code class="language-rust ignore">use std::time::Duration;
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use testing_framework_core::scenario::ScenarioBuilder;
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use testing_framework_workflows::{ChaosBuilderExt, ScenarioBuilderExt};
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pub fn determinism_first() {
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// Separate: functional test (deterministic)
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let _plan = ScenarioBuilder::topology_with(|t| t.network_star().validators(2).executors(1))
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.transactions_with(|txs| {
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txs.rate(5) // 5 transactions per block
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})
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.expect_consensus_liveness()
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.build();
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// Separate: chaos test (introduces randomness)
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let _chaos_plan =
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ScenarioBuilder::topology_with(|t| t.network_star().validators(3).executors(2))
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.enable_node_control()
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.chaos_with(|c| {
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c.restart()
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.min_delay(Duration::from_secs(30))
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.max_delay(Duration::from_secs(60))
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.target_cooldown(Duration::from_secs(45))
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.apply()
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})
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.transactions_with(|txs| {
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txs.rate(5) // 5 transactions per block
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})
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.expect_consensus_liveness()
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.build();
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}</code></pre>
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<p><strong>Why it matters:</strong> Mixing determinism with chaos creates noisy, hard-to-debug
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failures. Separate concerns make failures actionable.</p>
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<h2 id="observable-health-signals"><a class="header" href="#observable-health-signals">Observable Health Signals</a></h2>
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<p>Prefer <strong>user-facing signals</strong> over internal state:</p>
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<p><strong>Good checks:</strong></p>
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<ul>
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<li>Blocks progressing at expected rate (liveness)</li>
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<li>Transactions included within N blocks (inclusion)</li>
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<li>DA blobs retrievable (availability)</li>
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</ul>
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<p><strong>Avoid internal checks:</strong></p>
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<ul>
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<li>Memory pool size</li>
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<li>Internal service state</li>
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<li>Cache hit rates</li>
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</ul>
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<p><strong>Why it matters:</strong> User-facing signals reflect actual system health.
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Internal state can be "healthy" while the system is broken from a user
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perspective.</p>
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<h2 id="minimum-run-windows"><a class="header" href="#minimum-run-windows">Minimum Run Windows</a></h2>
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<p>Always run long enough for <strong>meaningful block production</strong>:</p>
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<pre><code class="language-rust ignore">use std::time::Duration;
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use testing_framework_core::scenario::ScenarioBuilder;
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use testing_framework_workflows::ScenarioBuilderExt;
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pub fn minimum_run_windows() {
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// Bad: too short (~2 blocks with default 2s slots, 0.9 coeff)
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let _too_short = ScenarioBuilder::with_node_counts(1, 0)
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.with_run_duration(Duration::from_secs(5))
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.expect_consensus_liveness()
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.build();
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// Good: enough blocks for assertions (~27 blocks with default 2s slots, 0.9
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// coeff)
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let _good = ScenarioBuilder::with_node_counts(1, 0)
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.with_run_duration(Duration::from_secs(60))
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.expect_consensus_liveness()
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.build();
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}</code></pre>
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<p><strong>Note:</strong> Block counts assume default consensus parameters:</p>
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<ul>
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<li>Slot duration: 2 seconds (configurable via <code>CONSENSUS_SLOT_TIME</code>)</li>
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<li>Active slot coefficient: 0.9 (90% block probability per slot, configurable via <code>CONSENSUS_ACTIVE_SLOT_COEFF</code>)</li>
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<li>Formula: <code>blocks ≈ (duration / slot_duration) × active_slot_coeff</code></li>
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</ul>
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<p>If upstream changes these parameters, adjust your duration expectations accordingly.</p>
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<p>The framework enforces minimum durations (at least 2× slot duration), but be explicit. Very short runs risk false confidence—one lucky block doesn't prove liveness.</p>
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<h2 id="summary"><a class="header" href="#summary">Summary</a></h2>
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<p>These principles keep scenarios:</p>
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<ul>
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<li><strong>Portable</strong> across environments (protocol time, declarative)</li>
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<li><strong>Debuggable</strong> (determinism, separation of concerns)</li>
|
||
<li><strong>Meaningful</strong> (observable signals, sufficient duration)</li>
|
||
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