Add sys import to test files and remove obsolete integration tests

- Add sys import to 29 test files across agent-coordinator, blockchain-event-bridge, blockchain-node, and coordinator-api
- Remove apps/blockchain-event-bridge/tests/test_integration.py (obsolete bridge integration tests)
- Remove apps/coordinator-api/tests/test_integration.py (obsolete API integration tests)
- Implement GPU registration in marketplace_gpu.py with GPURegistry model persistence

apps/trading-engine/tests/test_edge_cases_trading_engine.py

@@ -0,0 +1,208 @@
+"""Edge case and error handling tests for trading engine service"""
+
+import pytest
+import sys
+import sys
+from pathlib import Path
+from fastapi.testclient import TestClient
+from datetime import datetime
+
+
+from main import app, Order, order_books, orders, trades
+
+
+@pytest.fixture(autouse=True)
+def reset_state():
+    """Reset global state before each test"""
+    order_books.clear()
+    orders.clear()
+    trades.clear()
+    yield
+    order_books.clear()
+    orders.clear()
+    trades.clear()
+
+
+@pytest.mark.unit
+def test_order_zero_quantity():
+    """Test Order with zero quantity"""
+    order = Order(
+        order_id="order_123",
+        symbol="AITBC/BTC",
+        side="buy",
+        type="limit",
+        quantity=0.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    assert order.quantity == 0.0
+
+
+@pytest.mark.unit
+def test_order_negative_quantity():
+    """Test Order with negative quantity"""
+    order = Order(
+        order_id="order_123",
+        symbol="AITBC/BTC",
+        side="buy",
+        type="limit",
+        quantity=-100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    assert order.quantity == -100.0
+
+
+@pytest.mark.unit
+def test_order_negative_price():
+    """Test Order with negative price"""
+    order = Order(
+        order_id="order_123",
+        symbol="AITBC/BTC",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=-0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    assert order.price == -0.00001
+
+
+@pytest.mark.unit
+def test_order_empty_symbol():
+    """Test Order with empty symbol"""
+    order = Order(
+        order_id="order_123",
+        symbol="",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    assert order.symbol == ""
+
+
+@pytest.mark.integration
+def test_cancel_filled_order():
+    """Test cancelling a filled order"""
+    client = TestClient(app)
+    order = Order(
+        order_id="order_129",
+        symbol="AITBC/BTC",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    client.post("/api/v1/orders/submit", json=order.model_dump(mode='json'))
+    
+    # Manually mark as filled
+    orders["order_129"]["status"] = "filled"
+    
+    response = client.delete("/api/v1/orders/order_129")
+    assert response.status_code == 400
+
+
+@pytest.mark.integration
+def test_submit_order_with_slash_in_symbol():
+    """Test submitting order with slash in symbol"""
+    client = TestClient(app)
+    order = Order(
+        order_id="order_130",
+        symbol="AITBC/BTC",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    response = client.post("/api/v1/orders/submit", json=order.model_dump(mode='json'))
+    assert response.status_code == 200
+
+
+@pytest.mark.integration
+def test_submit_order_with_hyphen_in_symbol():
+    """Test submitting order with hyphen in symbol"""
+    client = TestClient(app)
+    order = Order(
+        order_id="order_131",
+        symbol="AITBC-BTC",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    response = client.post("/api/v1/orders/submit", json=order.model_dump(mode='json'))
+    assert response.status_code == 200
+
+
+@pytest.mark.integration
+def test_list_orders_with_no_orders():
+    """Test listing orders when no orders exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/orders")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_orders"] == 0
+
+
+@pytest.mark.integration
+def test_list_trades_with_no_trades():
+    """Test listing trades when no trades exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/trades")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_trades"] == 0
+
+
+@pytest.mark.integration
+def test_get_market_data_with_no_symbols():
+    """Test getting market data when no symbols exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/market-data")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_symbols"] == 0
+
+
+@pytest.mark.integration
+def test_order_book_depth_parameter():
+    """Test order book with depth parameter"""
+    client = TestClient(app)
+    order = Order(
+        order_id="order_132",
+        symbol="AITBC-BTC",
+        side="buy",
+        type="limit",
+        quantity=100.0,
+        price=0.00001,
+        user_id="user_123",
+        timestamp=datetime.utcnow()
+    )
+    client.post("/api/v1/orders/submit", json=order.model_dump(mode='json'))
+    
+    response = client.get("/api/v1/orderbook/AITBC-BTC?depth=5")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["symbol"] == "AITBC-BTC"
+
+
+@pytest.mark.integration
+def test_list_trades_limit_parameter():
+    """Test listing trades with limit parameter"""
+    client = TestClient(app)
+    response = client.get("/api/v1/trades?limit=10")
+    assert response.status_code == 200
+    data = response.json()
+    assert "trades" in data