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/global-infrastructure/tests/test_edge_cases_global_infrastructure.py

@@ -0,0 +1,195 @@
+"""Edge case and error handling tests for global infrastructure service"""
+
+import pytest
+import sys
+import sys
+from pathlib import Path
+from fastapi.testclient import TestClient
+from datetime import datetime
+
+
+from main import app, Region, GlobalDeployment, LoadBalancer, PerformanceMetrics, global_regions, deployments, load_balancers, performance_metrics
+
+
+@pytest.fixture(autouse=True)
+def reset_state():
+    """Reset global state before each test"""
+    global_regions.clear()
+    deployments.clear()
+    load_balancers.clear()
+    performance_metrics.clear()
+    yield
+    global_regions.clear()
+    deployments.clear()
+    load_balancers.clear()
+    performance_metrics.clear()
+
+
+@pytest.mark.unit
+def test_region_negative_capacity():
+    """Test Region with negative capacity"""
+    region = Region(
+        region_id="us-west-1",
+        name="US West",
+        location="North America",
+        endpoint="https://us-west-1.api.aitbc.dev",
+        status="active",
+        capacity=-1000,
+        current_load=-500,
+        latency_ms=-50,
+        compliance_level="full"
+    )
+    assert region.capacity == -1000
+    assert region.current_load == -500
+
+
+@pytest.mark.unit
+def test_region_empty_name():
+    """Test Region with empty name"""
+    region = Region(
+        region_id="us-west-1",
+        name="",
+        location="North America",
+        endpoint="https://us-west-1.api.aitbc.dev",
+        status="active",
+        capacity=8000,
+        current_load=2000,
+        latency_ms=50,
+        compliance_level="full"
+    )
+    assert region.name == ""
+
+
+@pytest.mark.unit
+def test_deployment_empty_target_regions():
+    """Test GlobalDeployment with empty target regions"""
+    deployment = GlobalDeployment(
+        deployment_id="deploy_123",
+        service_name="test-service",
+        target_regions=[],
+        configuration={},
+        deployment_strategy="blue_green",
+        health_checks=[]
+    )
+    assert deployment.target_regions == []
+
+
+@pytest.mark.unit
+def test_load_balancer_negative_health_check_interval():
+    """Test LoadBalancer with negative health check interval"""
+    balancer = LoadBalancer(
+        balancer_id="lb_123",
+        name="Main LB",
+        algorithm="round_robin",
+        target_regions=["us-east-1"],
+        health_check_interval=-30,
+        failover_threshold=3
+    )
+    assert balancer.health_check_interval == -30
+
+
+@pytest.mark.unit
+def test_performance_metrics_negative_values():
+    """Test PerformanceMetrics with negative values"""
+    metrics = PerformanceMetrics(
+        region_id="us-east-1",
+        timestamp=datetime.utcnow(),
+        cpu_usage=-50.5,
+        memory_usage=-60.2,
+        network_io=-1000.5,
+        disk_io=-500.3,
+        active_connections=-100,
+        response_time_ms=-45.2
+    )
+    assert metrics.cpu_usage == -50.5
+    assert metrics.active_connections == -100
+
+
+@pytest.mark.integration
+def test_list_regions_with_no_regions():
+    """Test listing regions when no regions exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/regions")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_regions"] == 0
+
+
+@pytest.mark.integration
+def test_list_deployments_with_no_deployments():
+    """Test listing deployments when no deployments exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/deployments")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_deployments"] == 0
+
+
+@pytest.mark.integration
+def test_list_load_balancers_with_no_balancers():
+    """Test listing load balancers when no balancers exist"""
+    client = TestClient(app)
+    response = client.get("/api/v1/load-balancers")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total_balancers"] == 0
+
+
+@pytest.mark.integration
+def test_get_deployment_not_found():
+    """Test getting nonexistent deployment"""
+    client = TestClient(app)
+    response = client.get("/api/v1/deployments/nonexistent")
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_get_region_performance_no_data():
+    """Test getting region performance when no data exists"""
+    client = TestClient(app)
+    response = client.get("/api/v1/performance/nonexistent")
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_get_region_compliance_nonexistent():
+    """Test getting compliance for nonexistent region"""
+    client = TestClient(app)
+    response = client.get("/api/v1/compliance/nonexistent")
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_create_load_balancer_nonexistent_region():
+    """Test creating load balancer with nonexistent region"""
+    client = TestClient(app)
+    balancer = LoadBalancer(
+        balancer_id="lb_123",
+        name="Main LB",
+        algorithm="round_robin",
+        target_regions=["nonexistent"],
+        health_check_interval=30,
+        failover_threshold=3
+    )
+    response = client.post("/api/v1/load-balancers/create", json=balancer.model_dump())
+    assert response.status_code == 400
+
+
+@pytest.mark.integration
+def test_list_deployments_with_status_filter():
+    """Test listing deployments with status filter"""
+    client = TestClient(app)
+    response = client.get("/api/v1/deployments?status=pending")
+    assert response.status_code == 200
+    data = response.json()
+    assert "status_filter" in data
+
+
+@pytest.mark.integration
+def test_global_dashboard_with_no_data():
+    """Test global dashboard with no data"""
+    client = TestClient(app)
+    response = client.get("/api/v1/global/dashboard")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["dashboard"]["infrastructure"]["total_regions"] == 0