proffesor-for-testing__agentic-qe/docs/implementation/ddd/test-execution.md

Test Execution Domain

Bounded Context Overview

Domain: Test Execution Responsibility: Parallel test running, flaky detection, and intelligent retry Location: src/domains/test-execution/

The Test Execution domain handles the actual running of tests, including parallel execution, flaky test detection, retry strategies, and test prioritization using reinforcement learning.

Ubiquitous Language

Term	Definition
Test Run	A single execution session with results
Flaky Test	Test with inconsistent pass/fail results
Sharding	Strategy for distributing tests across workers
Retry	Re-execution of failed tests with backoff
Prioritization	RL-based ordering of test execution
E2E Step	Individual action in an end-to-end test
User Flow	Recorded sequence of user interactions
Virtual User	Simulated user in load testing scenarios

Domain Model

Aggregates

TestRunResult (Aggregate Root)

Represents the complete result of a test execution session.

interface ITestRunResult {
  runId: string;
  status: 'passed' | 'failed' | 'error';
  total: number;
  passed: number;
  failed: number;
  skipped: number;
  duration: number;
  failedTests: IFailedTest[];
  coverage?: ICoverageData;
}

E2ETestSuite (Aggregate Root)

Collection of end-to-end test cases.

interface E2ETestSuite {
  id: string;
  name: string;
  testCases: E2ETestCase[];
  hooks?: E2ETestHooks;
  defaultViewport?: Viewport;
}

Entities

FailedTest

Details of a test failure.

interface IFailedTest {
  testId: string;
  testName: string;
  file: string;
  error: string;
  stack?: string;
  duration: number;
}

FlakyTest

Analysis of a flaky test with remediation.

interface IFlakyTest {
  testId: string;
  testName: string;
  file: string;
  failureRate: number;
  pattern: 'timing' | 'ordering' | 'resource' | 'async' | 'unknown';
  recommendation: string;
}

E2ETestCase

Individual end-to-end test case.

interface E2ETestCase {
  id: string;
  name: string;
  steps: E2EStep[];
  viewport?: Viewport;
  timeout?: number;
  retries?: number;
}

Value Objects

CoverageData

Immutable coverage metrics.

interface ICoverageData {
  readonly line: number;
  readonly branch: number;
  readonly function: number;
  readonly statement: number;
}

TestPrioritizationFeatures

Normalized feature vector for RL-based prioritization.

interface TestPrioritizationFeatures {
  readonly failureProbability: number;  // Recent failure history
  readonly flakiness: number;           // Flakiness score
  readonly complexity: number;          // Code complexity
  readonly coverageGap: number;         // 1 - coverage
  readonly criticality: number;         // Business criticality
  readonly speed: number;               // Inverse of duration
  readonly age: number;                 // Inverse of modification time
  readonly dependencyComplexity: number; // Dependency count normalized
}

Viewport

Browser viewport configuration.

interface Viewport {
  readonly width: number;
  readonly height: number;
  readonly deviceScaleFactor: number;
  readonly isMobile: boolean;
  readonly hasTouch: boolean;
}

Domain Services

ITestExecutionAPI

Primary API for the domain.

interface ITestExecutionAPI {
  runTests(request: ISimpleTestRequest): Promise<Result<ITestRunResult, Error>>;
  execute(request: IExecuteTestsRequest): Promise<Result<ITestRunResult, Error>>;
  executeParallel(request: IParallelExecutionRequest): Promise<Result<ITestRunResult, Error>>;
  detectFlaky(request: IFlakyDetectionRequest): Promise<Result<IFlakyTestReport, Error>>;
  retry(request: IRetryRequest): Promise<Result<IRetryResult, Error>>;
  getStats(runId: string): Promise<Result<IExecutionStats, Error>>;
  executeE2ETestCase?(testCase: E2ETestCase): Promise<Result<E2ETestResult, Error>>;
  executeE2ETestSuite?(suite: E2ETestSuite, strategy?: ExecutionStrategy): Promise<Result<E2ETestSuiteResult, Error>>;
}

Domain Events

Event	Trigger	Payload
TestRunStartedEvent	Execution begins	{ runId, testFiles, workers }
TestRunCompletedEvent	Execution finishes	{ runId, status, results }
FlakyTestDetectedEvent	Flaky test identified	{ testId, failureRate, pattern }
TestRetryEvent	Test being retried	{ testId, attempt, reason }

Reinforcement Learning Integration

Test Prioritization with Decision Trees

The domain uses RL to optimize test execution order:

// State representation
interface TestPrioritizationState {
  id: string;
  features: number[];           // 8-dimensional feature vector
  filePath: string;
  testName: string;
  complexity: number;
  estimatedDuration: number;
  coverage: number;
  failureRate: number;
  flakinessScore: number;
  // ... additional state
}

// Actions
type PriorityAction = 'critical' | 'high' | 'standard' | 'low' | 'defer';

// Reward calculation
function calculatePrioritizationReward(context, result): TestPrioritizationReward {
  return {
    earlyDetection: result.failedEarly ? 0.5 : 0,
    timeEfficiency: Math.max(0, 1 - result.executionTime / context.availableTime) * 0.3,
    coverageGain: result.coverageImproved ? 0.2 : 0,
    flakinessReduction: result.flakyDetected ? 0.1 : 0,
    total: // sum of above
  };
}

Context Integration

Upstream Dependencies

• Test Generation: Provides tests to execute
• Code Intelligence: Dependency analysis for ordering

Downstream Consumers

• Coverage Analysis: Receives execution coverage data
• Quality Assessment: Uses results for quality gates
• Defect Intelligence: Analyzes failure patterns

Anti-Corruption Layer

The domain isolates test framework specifics through the ExecutionStrategy pattern, allowing different runners (Jest, Vitest, Mocha, pytest) to be used interchangeably.

Task Handlers

Task Type	Handler	Description
execute-tests	execute()	Run test suite
execute-parallel	executeParallel()	Parallel execution
detect-flaky	detectFlaky()	Flaky test detection
retry-failed	retry()	Retry failed tests

Configuration Constants

const TEST_EXECUTION_CONSTANTS = {
  DEFAULT_TEST_TIMEOUT_MS: 60000,
  DEFAULT_FILE_TIMEOUT_MS: 30000,
  MAX_WORKERS: 32,
  MAX_TESTS_TRACKED: 10000,
  MAX_EXECUTION_HISTORY: 100,
  ANALYSIS_CACHE_TTL_MS: 3600000,
};

const RETRY_CONSTANTS = {
  BASE_DELAY_MS: 1000,
  MAX_DELAY_MS: 30000,
  DEFAULT_FLAKY_RATE: 0.3,
  DEFAULT_FLAKY_PASS_RATE: 0.7,
};

E2E Step Types

The domain supports rich E2E step definitions:

Step Type	Purpose
navigate	Navigate to URL
click	Click element
type	Type text into input
wait	Wait for condition
assert	Verify assertion
screenshot	Capture screenshot
a11y-check	Run accessibility check

ADR References

• ADR-051: LLM-powered flaky test analysis
• ADR-047: MinCut topology for distributed execution