@codeforbreakfast/eventsourcing-testing-contracts
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Comprehensive testing utilities for event sourcing implementations - Test contracts for transport and protocol implementations with mock utilities and test data generators
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JavaScript
/**
* Future Transport Behavior Test Placeholders
*
* IMPORTANT: This module contains placeholder test suites for potential future transport behaviors
* that are NOT currently implemented or supported in any existing transport. These are purely
* conceptual tests for features that might be added in the future.
*
* ## What This Contains
*
* All tests in this module are **permanently skipped** and represent future possibilities that:
* - Are NOT implemented in any current transport
* - Are NOT required for basic transport functionality
* - Are speculative features for potential future development
* - Serve as documentation for what might be possible someday
*
* ## THESE TESTS ARE NOT FOR CURRENT USE
*
* DO NOT enable or implement these tests. They are placeholders for future consideration only.
* If you need additional transport features beyond the core contracts, implement them as
* transport-specific tests in your own test files.
*
* ### Reconnection Behavior
* Enable if your transport automatically reconnects after connection failures:
* - Implements exponential backoff retry strategy
* - Maintains subscriptions through reconnection
* - Handles network partitions gracefully
*
* ### Message Buffering
* Enable if your transport queues messages when disconnected:
* - Buffers outgoing messages during disconnection
* - Sends buffered messages when reconnected
* - Respects configurable buffer size limits
*
* ### Message Ordering
* Enable if your transport guarantees message delivery order:
* - Maintains FIFO order for messages within streams
* - Preserves ordering across reconnections
* - Provides per-subscription ordering guarantees
*
* ### Backpressure Handling
* Enable if your transport manages flow control:
* - Handles high-volume message streams without memory issues
* - Provides backpressure signals to publishers
* - Manages backpressure independently per connection
*
* ### Maximum Message Size
* Enable if your transport enforces message size limits:
* - Rejects messages exceeding configured size limits
* - Provides clear error messages for oversized content
* - Handles size validation consistently
*
* ### Connection Pooling
* Enable if your transport implements connection reuse:
* - Reuses connections efficiently across requests
* - Manages connection pool size limits
* - Cleans up idle connections automatically
*
* ### Quality of Service
* Enable if your transport supports message priorities and delivery guarantees:
* - Supports message priority levels
* - Provides at-least-once or exactly-once delivery guarantees
* - Implements message acknowledgment mechanisms
*
* ## How to Enable Optional Tests
*
* To enable specific optional behaviors for your transport:
*
* 1. **Copy the relevant test suite** from this file to your transport test file
* 2. **Remove the `.skip`** from the `describe.skip` calls
* 3. **Implement the test logic** specific to your transport
* 4. **Add necessary test utilities** to your transport context
*
* ### Example: Enabling Reconnection Tests
*
* ```typescript
* // In your transport test file
* describe('Reconnection Behavior', () => {
* it('should automatically reconnect after connection loss', async () => {
* await Effect.runPromise(
* Effect.scoped(
* pipe(
* context.makeConnectedTransport('test://localhost'),
* Effect.flatMap((transport) =>
* pipe(
* // Test reconnection logic here
* context.simulateNetworkFailure(),
* Effect.flatMap(() => context.waitForReconnection()),
* Effect.tap(() => Effect.sync(() => {
* expect(transport.isConnected()).toBe(true);
* }))
* )
* )
* )
* )
* );
* });
* });
* ```
*
* ## Implementation Guidelines
*
* When implementing optional behaviors:
*
* 1. **Start with core requirements**: Ensure all required transport contract tests pass first
* 2. **Implement incrementally**: Add one optional behavior at a time
* 3. **Document capabilities**: Clearly document which optional features your transport supports
* 4. **Provide configuration**: Make optional behaviors configurable when possible
* 5. **Test thoroughly**: Optional behaviors often involve complex edge cases
*
* ## Feature Support Declaration
*
* Consider adding a capabilities object to your transport to declare supported features:
*
* ```typescript
* interface TransportCapabilities {
* readonly supportsReconnection: boolean;
* readonly supportsBuffering: boolean;
* readonly guaranteesOrdering: boolean;
* readonly supportsBackpressure: boolean;
* readonly maxMessageSize?: number;
* readonly supportsConnectionPooling: boolean;
* readonly supportsQoS: boolean;
* }
* ```
*
* @example
* ```typescript
* // Enable reconnection tests for a WebSocket transport
* describe('WebSocket Reconnection', () => {
* it('should reconnect with exponential backoff', async () => {
* const transport = await Effect.runPromise(createWebSocketTransport());
*
* // Simulate network failure
* await Effect.runPromise(transport.simulateNetworkFailure());
*
* // Verify reconnection occurs
* await Effect.runPromise(
* pipe(
* transport.connectionState,
* Stream.filter(state => state === 'connected'),
* Stream.take(1),
* Stream.runHead,
* Effect.timeout(Duration.seconds(10))
* )
* );
* });
* });
* ```
*/
import { describe, it } from '@codeforbreakfast/buntest';
/**
* Future transport behavior test placeholders.
*
* This function returns a test suite containing conceptual test ideas for potential future transport
* features. These tests are NOT intended for current implementation and remain permanently skipped.
*
* ## Usage
*
* 1. **Documentation only**: Shows what kinds of features might be possible in the future
* 2. **Do not implement**: These tests are not meant to be copied or enabled
* 3. **Use core contracts**: Focus on the actual transport contract tests instead
*
* All tests in this suite are **permanently skipped** and serve only as future documentation.
*
* ## Example Usage
*
* ```typescript
* import { optionalTransportBehaviorTests } from '@codeforbreakfast/eventsourcing-testing-contracts';
*
* describe('My Transport Optional Features', () => {
* // Include all optional tests as reference (all skipped)
* optionalTransportBehaviorTests();
*
* // Or copy specific tests and enable them:
* describe('Reconnection Behavior', () => {
* it('should automatically reconnect after connection loss', async () => {
* // Your implementation here
* });
* });
* });
* ```
*
* ## Test Categories Included
*
* - **Reconnection Behavior**: Automatic reconnection, exponential backoff, subscription persistence
* - **Message Buffering**: Offline message queuing, buffer limits, message ordering in buffers
* - **Message Ordering**: FIFO guarantees, ordering during reconnection, per-subscription ordering
* - **Backpressure Handling**: Flow control, backpressure signals, per-connection management
* - **Maximum Message Size**: Size limits, validation, error handling for oversized messages
* - **Connection Pooling**: Connection reuse, pool limits, idle connection cleanup
* - **Quality of Service**: Message priorities, delivery guarantees, acknowledgments
*
* @returns Test suite with all optional transport behavior tests (all skipped)
*
* @example
* ```typescript
* // Include as reference in your test file
* describe('Advanced WebSocket Transport', () => {
* runClientTransportContractTests('WebSocket', setupWebSocket);
*
* // Show what optional features could be implemented
* optionalTransportBehaviorTests();
*
* // Implement specific optional features
* describe('WebSocket Reconnection', () => {
* it('should reconnect automatically', () => {
* // Your reconnection test implementation
* });
* });
* });
* ```
*/
export const optionalTransportBehaviorTests = () => {
describe('Optional Transport Behaviors', () => {
describe.skip('Reconnection Behavior', () => {
it('should automatically reconnect after connection loss', () => {
// TODO: Implement reconnection test when transport supports it
// Test should verify automatic reconnection after network failure
});
it('should handle reconnection with exponential backoff', () => {
// TODO: Implement backoff test when transport supports it
// Test should verify reconnection attempts use exponential backoff
});
it('should maintain subscriptions through reconnection', () => {
// TODO: Implement subscription persistence test
// Test should verify subscriptions remain active after reconnection
});
});
describe.skip('Message Buffering', () => {
it('should buffer messages when disconnected and send when reconnected', () => {
// TODO: Implement buffering test when transport supports it
// Test should verify messages sent while disconnected are queued and delivered on reconnection
});
it('should respect buffer size limits', () => {
// TODO: Implement buffer limit test
// Test should verify transport handles buffer overflow gracefully
});
it('should preserve message order in buffer', () => {
// TODO: Implement buffer ordering test
// Test should verify buffered messages maintain original order
});
});
describe.skip('Message Ordering', () => {
it('should maintain message order during normal operation', () => {
// TODO: Implement ordering test when transport guarantees order
// Test should verify messages arrive in the order they were sent
});
it('should handle message ordering during reconnection', () => {
// TODO: Implement reconnection ordering test
// Test should verify message order is maintained across connection interruptions
});
it('should provide ordering guarantees per subscription', () => {
// TODO: Implement per-subscription ordering test
// Test should verify ordering is maintained within each subscription stream
});
});
describe.skip('Backpressure Handling', () => {
it('should handle backpressure gracefully', () => {
// TODO: Implement backpressure test when transport supports it
// Test should verify transport handles high-volume message streams without crashing
});
it('should provide backpressure signals to publishers', () => {
// TODO: Implement backpressure signaling test
// Test should verify publishers receive appropriate signals when backpressure occurs
});
it('should apply backpressure per connection', () => {
// TODO: Implement per-connection backpressure test
// Test should verify backpressure is managed independently for each connection
});
});
describe.skip('Maximum Message Size', () => {
it('should enforce maximum message size limits', () => {
// TODO: Implement size limit test when transport enforces limits
// Test should verify messages exceeding size limits are rejected
});
it('should accept messages within size limits', () => {
// TODO: Implement size acceptance test
// Test should verify normal-sized messages are accepted successfully
});
it('should provide clear error messages for oversized content', () => {
// TODO: Implement size error test
// Test should verify clear error messages are provided for oversized messages
});
});
describe.skip('Connection Pooling', () => {
it('should reuse connections efficiently', () => {
// TODO: Implement connection reuse test when transport supports pooling
// Test should verify connections are reused rather than creating new ones unnecessarily
});
it('should handle connection pool limits', () => {
// TODO: Implement pool limit test
// Test should verify behavior when connection pool reaches maximum capacity
});
it('should clean up idle connections', () => {
// TODO: Implement idle cleanup test
// Test should verify idle connections are cleaned up after timeout
});
});
describe.skip('Quality of Service', () => {
it('should support message priority levels', () => {
// TODO: Implement priority test when transport supports QoS
// Test should verify high-priority messages are delivered before low-priority ones
});
it('should provide delivery guarantees', () => {
// TODO: Implement delivery guarantee test
// Test should verify at-least-once or exactly-once delivery as configured
});
it('should support message acknowledgments', () => {
// TODO: Implement acknowledgment test
// Test should verify message acknowledgment mechanisms work correctly
});
});
});
};
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