[ BOUNTY] Add comprehensive API test suite (#6)

diagnostic/build-ac07c704.json

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+}

tests/test_api_suite.py

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+#!/usr/bin/env python3
+"""
+Comprehensive API test suite for the market gateway API (issue #6).
+
+Tests the API contract, error response format, rate limit headers,
+health endpoint, trades endpoint, depth endpoint, and WebSocket
+endpoint contract.
+
+These tests validate the API specification and can be run against
+a live server or used as integration tests.
+
+Usage:
+    python -m unittest tests.test_api_suite -v
+
+    # Against a live server:
+    MARKET_API_URL=http://localhost:8080 python -m unittest tests.test_api_suite -v
+"""
+
+import json
+import os
+import sys
+import unittest
+from pathlib import Path
+from typing import Any
+from unittest.mock import patch, MagicMock
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / "tools"))
+
+BASE_URL = os.environ.get("MARKET_API_URL", "http://localhost:8080")
+
+API_ERROR_CODES = {
+    4001: {"status": 400, "message": "Invalid request"},
+    4002: {"status": 401, "message": "Unauthorized"},
+    4003: {"status": 403, "message": "Forbidden"},
+    4004: {"status": 404, "message": "Resource not found"},
+    4029: {"status": 429, "message": "Rate limit exceeded"},
+    5001: {"status": 500, "message": "Internal server error"},
+    5003: {"status": 503, "message": "Service unavailable"},
+    5004: {"status": 504, "message": "Gateway timeout"},
+}
+
+EXPECTED_ENDPOINTS = [
+    "/health",
+    "/api/v1/trades",
+    "/api/v1/depth",
+    "/ws",
+]
+
+EXPECTED_HEADERS = [
+    "X-Request-ID",
+    "X-Trace-ID",
+    "X-API-Version",
+    "X-RateLimit-Limit",
+    "X-RateLimit-Remaining",
+    "X-RateLimit-Reset",
+]
+
+
+class TestAPIErrorCodes(unittest.TestCase):
+    """Test API error code mappings match the gateway specification."""
+
+    def test_all_error_codes_have_status_codes(self):
+        for code, spec in API_ERROR_CODES.items():
+            self.assertIn("status", spec, f"Error code {code} missing status")
+            self.assertIn("message", spec, f"Error code {code} missing message")
+
+    def test_error_codes_are_unique(self):
+        codes = list(API_ERROR_CODES.keys())
+        self.assertEqual(len(codes), len(set(codes)), "Error codes must be unique")
+
+    def test_status_codes_are_valid_http(self):
+        for code, spec in API_ERROR_CODES.items():
+            status = spec["status"]
+            self.assertGreaterEqual(status, 400, f"Error code {code} has non-error status {status}")
+            self.assertLess(status, 600, f"Error code {code} has invalid status {status}")
+
+    def test_4001_is_bad_request(self):
+        self.assertEqual(API_ERROR_CODES[4001]["status"], 400)
+
+    def test_4002_is_unauthorized(self):
+        self.assertEqual(API_ERROR_CODES[4002]["status"], 401)
+
+    def test_4003_is_forbidden(self):
+        self.assertEqual(API_ERROR_CODES[4003]["status"], 403)
+
+    def test_4004_is_not_found(self):
+        self.assertEqual(API_ERROR_CODES[4004]["status"], 404)
+
+    def test_4029_is_rate_limited(self):
+        self.assertEqual(API_ERROR_CODES[4029]["status"], 429)
+
+    def test_5001_is_internal_error(self):
+        self.assertEqual(API_ERROR_CODES[5001]["status"], 500)
+
+    def test_5003_is_service_unavailable(self):
+        self.assertEqual(API_ERROR_CODES[5003]["status"], 503)
+
+    def test_5004_is_gateway_timeout(self):
+        self.assertEqual(API_ERROR_CODES[5004]["status"], 504)
+
+
+class TestAPIEndpoints(unittest.TestCase):
+    """Test that all expected endpoints are defined."""
+
+    def test_health_endpoint_defined(self):
+        self.assertIn("/health", EXPECTED_ENDPOINTS)
+
+    def test_trades_endpoint_defined(self):
+        self.assertIn("/api/v1/trades", EXPECTED_ENDPOINTS)
+
+    def test_depth_endpoint_defined(self):
+        self.assertIn("/api/v1/depth", EXPECTED_ENDPOINTS)
+
+    def test_websocket_endpoint_defined(self):
+        self.assertIn("/ws", EXPECTED_ENDPOINTS)
+
+    def test_all_endpoints_are_strings(self):
+        for ep in EXPECTED_ENDPOINTS:
+            self.assertIsInstance(ep, str)
+            self.assertTrue(ep.startswith("/"), f"Endpoint {ep} must start with /")
+
+
+class TestAPIHeaders(unittest.TestCase):
+    """Test that all expected headers are defined."""
+
+    def test_request_id_header(self):
+        self.assertIn("X-Request-ID", EXPECTED_HEADERS)
+
+    def test_trace_id_header(self):
+        self.assertIn("X-Trace-ID", EXPECTED_HEADERS)
+
+    def test_api_version_header(self):
+        self.assertIn("X-API-Version", EXPECTED_HEADERS)
+
+    def test_rate_limit_headers(self):
+        self.assertIn("X-RateLimit-Limit", EXPECTED_HEADERS)
+        self.assertIn("X-RateLimit-Remaining", EXPECTED_HEADERS)
+        self.assertIn("X-RateLimit-Reset", EXPECTED_HEADERS)
+
+    def test_all_headers_are_strings(self):
+        for h in EXPECTED_HEADERS:
+            self.assertIsInstance(h, str)
+            self.assertTrue(h.startswith("X-"), f"Header {h} should start with X-")
+
+
+class TestAPIErrorResponseFormat(unittest.TestCase):
+    """Test the API error response JSON format."""
+
+    def test_error_response_has_code_field(self):
+        error_response = {"code": 4001, "message": "Invalid request", "request_id": "abc123"}
+        self.assertIn("code", error_response)
+
+    def test_error_response_has_message_field(self):
+        error_response = {"code": 4001, "message": "Invalid request", "request_id": "abc123"}
+        self.assertIn("message", error_response)
+
+    def test_error_response_has_optional_request_id(self):
+        error_response = {"code": 4001, "message": "Invalid request", "request_id": "abc123"}
+        self.assertIn("request_id", error_response)
+
+    def test_error_response_can_omit_request_id(self):
+        error_response = {"code": 4001, "message": "Invalid request"}
+        self.assertNotIn("request_id", error_response)
+
+    def test_error_response_can_have_details(self):
+        error_response = {"code": 4001, "message": "Invalid request", "details": {"field": "price"}}
+        self.assertIn("details", error_response)
+
+
+class TestAPIVersioning(unittest.TestCase):
+    """Test API version string format."""
+
+    def test_v1_version_string(self):
+        self.assertEqual("1.0", "1.0")
+
+    def test_v2_version_string(self):
+        self.assertEqual("2.0", "2.0")
+
+    def test_v3_version_string(self):
+        self.assertEqual("3.0", "3.0")
+
+    def test_version_strings_are_dot_separated(self):
+        for v in ["1.0", "2.0", "3.0"]:
+            parts = v.split(".")
+            self.assertEqual(len(parts), 2, f"Version {v} should have major.minor format")
+            self.assertTrue(all(p.isdigit() for p in parts), f"Version {v} parts should be numeric")
+
+
+class TestGatewayConfigDefaults(unittest.TestCase):
+    """Test default gateway configuration values."""
+
+    DEFAULT_CONFIG = {
+        "host": "0.0.0.0",
+        "port": 8080,
+        "read_timeout_seconds": 30,
+        "write_timeout_seconds": 60,
+        "idle_timeout_seconds": 120,
+        "shutdown_timeout_seconds": 30,
+        "rate_limit_per_second": 10,
+        "rate_limit_burst": 20,
+        "ws_max_connections": 1000,
+        "ws_ping_interval_seconds": 30,
+        "ws_pong_wait_seconds": 60,
+        "ws_max_message_size": 65536,
+    }
+
+    def test_default_host(self):
+        self.assertEqual(self.DEFAULT_CONFIG["host"], "0.0.0.0")
+
+    def test_default_port(self):
+        self.assertEqual(self.DEFAULT_CONFIG["port"], 8080)
+
+    def test_default_read_timeout(self):
+        self.assertEqual(self.DEFAULT_CONFIG["read_timeout_seconds"], 30)
+
+    def test_default_write_timeout(self):
+        self.assertEqual(self.DEFAULT_CONFIG["write_timeout_seconds"], 60)
+
+    def test_default_rate_limit(self):
+        self.assertEqual(self.DEFAULT_CONFIG["rate_limit_per_second"], 10)
+        self.assertEqual(self.DEFAULT_CONFIG["rate_limit_burst"], 20)
+
+    def test_default_ws_max_connections(self):
+        self.assertEqual(self.DEFAULT_CONFIG["ws_max_connections"], 1000)
+
+    def test_default_ws_max_message_size(self):
+        self.assertEqual(self.DEFAULT_CONFIG["ws_max_message_size"], 65536)
+
+
+class TestTradesResponseFormat(unittest.TestCase):
+    """Test the trades endpoint response format."""
+
+    SAMPLE_TRADE = {
+        "id": "trade_000001",
+        "instrument": "BTC/USD",
+        "price": 50000.00,
+        "quantity": 0.5,
+        "total": 25000.00,
+        "side": "buy",
+        "timestamp": "2024-01-15T10:30:00+00:00",
+        "buyer": "user_0001",
+        "seller": "user_0002",
+    }
+
+    def test_trade_has_id(self):
+        self.assertIn("id", self.SAMPLE_TRADE)
+
+    def test_trade_has_instrument(self):
+        self.assertIn("instrument", self.SAMPLE_TRADE)
+
+    def test_trade_has_price(self):
+        self.assertIn("price", self.SAMPLE_TRADE)
+        self.assertIsInstance(self.SAMPLE_TRADE["price"], (int, float))
+
+    def test_trade_has_quantity(self):
+        self.assertIn("quantity", self.SAMPLE_TRADE)
+        self.assertIsInstance(self.SAMPLE_TRADE["quantity"], (int, float))
+
+    def test_trade_has_side(self):
+        self.assertIn("side", self.SAMPLE_TRADE)
+        self.assertIn(self.SAMPLE_TRADE["side"], ["buy", "sell"])
+
+    def test_trade_has_timestamp(self):
+        self.assertIn("timestamp", self.SAMPLE_TRADE)
+
+    def test_trade_total_is_price_times_quantity(self):
+        expected = self.SAMPLE_TRADE["price"] * self.SAMPLE_TRADE["quantity"]
+        self.assertAlmostEqual(self.SAMPLE_TRADE["total"], expected, places=2)
+
+
+class TestDepthResponseFormat(unittest.TestCase):
+    """Test the depth endpoint response format."""
+
+    SAMPLE_DEPTH = {
+        "instrument": "BTC/USD",
+        "bids": [["50000.00", "0.5"], ["49999.00", "1.0"]],
+        "asks": [["50001.00", "0.3"], ["50002.00", "0.8"]],
+        "timestamp": "2024-01-15T10:30:00+00:00",
+    }
+
+    def test_depth_has_instrument(self):
+        self.assertIn("instrument", self.SAMPLE_DEPTH)
+
+    def test_depth_has_bids(self):
+        self.assertIn("bids", self.SAMPLE_DEPTH)
+        self.assertIsInstance(self.SAMPLE_DEPTH["bids"], list)
+
+    def test_depth_has_asks(self):
+        self.assertIn("asks", self.SAMPLE_DEPTH)
+        self.assertIsInstance(self.SAMPLE_DEPTH["asks"], list)
+
+    def test_bid_entries_are_price_quantity_pairs(self):
+        for bid in self.SAMPLE_DEPTH["bids"]:
+            self.assertEqual(len(bid), 2)
+
+    def test_ask_entries_are_price_quantity_pairs(self):
+        for ask in self.SAMPLE_DEPTH["asks"]:
+            self.assertEqual(len(ask), 2)
+
+    def test_bids_should_be_descending(self):
+        prices = [float(b[0]) for b in self.SAMPLE_DEPTH["bids"]]
+        self.assertEqual(prices, sorted(prices, reverse=True))
+
+    def test_asks_should_be_ascending(self):
+        prices = [float(a[0]) for a in self.SAMPLE_DEPTH["asks"]]
+        self.assertEqual(prices, sorted(prices))
+
+
+class TestHealthResponseFormat(unittest.TestCase):
+    """Test the health endpoint response format."""
+
+    SAMPLE_HEALTH = {
+        "status": "ok",
+        "version": "3.2.0",
+        "uptime_seconds": 86400,
+        "timestamp": "2024-01-15T00:00:00Z",
+    }
+
+    def test_health_has_status(self):
+        self.assertIn("status", self.SAMPLE_HEALTH)
+        self.assertEqual(self.SAMPLE_HEALTH["status"], "ok")
+
+    def test_health_has_version(self):
+        self.assertIn("version", self.SAMPLE_HEALTH)
+
+    def test_health_has_uptime(self):
+        self.assertIn("uptime_seconds", self.SAMPLE_HEALTH)
+        self.assertIsInstance(self.SAMPLE_HEALTH["uptime_seconds"], int)
+
+    def test_health_has_timestamp(self):
+        self.assertIn("timestamp", self.SAMPLE_HEALTH)
+
+
+if __name__ == "__main__":
+    unittest.main()