diff --git a/stapi-fastapi/pyproject.toml b/stapi-fastapi/pyproject.toml
index a7677a8..ebe3efe 100644
--- a/stapi-fastapi/pyproject.toml
+++ b/stapi-fastapi/pyproject.toml
@@ -23,6 +23,7 @@ dependencies = [
     "pyrfc3339>=1.1",
     "types-pyRFC3339>=1.1.1",
     "uvicorn>=0.29.0",
+    "schemathesis==3.37.0",
 ]
 
 [tool.hatch.build.targets.sdist]
diff --git a/stapi-fastapi/tests/conftest.py b/stapi-fastapi/tests/conftest.py
index f1a540f..a3afa3e 100644
--- a/stapi-fastapi/tests/conftest.py
+++ b/stapi-fastapi/tests/conftest.py
@@ -5,6 +5,7 @@
 from urllib.parse import urljoin
 
 import pytest
+import schemathesis
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from stapi_fastapi.models.product import (
@@ -182,3 +183,33 @@ def opportunity_search(limit) -> dict[str, Any]:
         },
         "limit": limit,
     }
+
+@pytest.fixture
+def stapi_app(
+    mock_products: list[Product],
+    base_url: str,
+    mock_opportunities: list[Opportunity],
+):
+    @asynccontextmanager
+    async def lifespan(app: FastAPI) -> AsyncIterator[dict[str, Any]]:
+        try:
+            yield {
+                "_orders_db": InMemoryOrderDB(),
+                "_opportunities": mock_opportunities,
+            }
+        finally:
+            pass
+
+    root_router = RootRouter(
+        get_orders=mock_get_orders,
+        get_order=mock_get_order,
+        get_order_statuses=mock_get_order_statuses,
+        conformances=[CORE],
+    )
+
+    for mock_product in mock_products:
+        root_router.add_product(mock_product)
+
+    app = FastAPI(lifespan=lifespan)
+    app.include_router(root_router, prefix="")
+    return schemathesis.from_dict(app.openapi())
\ No newline at end of file
diff --git a/pystapi-validator/tests/validate_api.py b/stapi-fastapi/tests/test_api_validation.py
similarity index 72%
rename from pystapi-validator/tests/validate_api.py
rename to stapi-fastapi/tests/test_api_validation.py
index 6a31d20..43b94d8 100644
--- a/pystapi-validator/tests/validate_api.py
+++ b/stapi-fastapi/tests/test_api_validation.py
@@ -1,5 +1,5 @@
 import json
-
+import warnings
 import pytest
 import schemathesis
 from schemathesis.checks import (
@@ -14,26 +14,24 @@
 schemathesis.experimental.OPEN_API_3_1.enable()
 
 SCHEMA_URL = "https://raw.githubusercontent.com/stapi-spec/stapi-spec/refs/heads/main/openapi.yaml"
-schema = schemathesis.from_uri(SCHEMA_URL)
-
-BASE_URL = "http://localhost:8000"
 
+# Create a test schema from your ASGI app
+schema = schemathesis.from_pytest_fixture("stapi_app")
 
 @schema.parametrize()
 def test_api(case):
-    response = case.call_and_validate(base_url=BASE_URL)
-    case.validate_response(response)
+    case.validate_response()
 
-    not_a_server_error(response, case)
-    status_code_conformance(response, case)
-    content_type_conformance(response, case)
-    response_schema_conformance(response, case)
-    response_headers_conformance(response, case)
-    negative_data_rejection(response, case)
+    not_a_server_error(case.response, case)
+    status_code_conformance(case.response, case)
+    content_type_conformance(case.response, case)
+    response_schema_conformance(case.response, case)
+    response_headers_conformance(case.response, case)
+    negative_data_rejection(case.response, case)
 
 
 def test_openapi_specification():
-    assert schema.validate()
+    assert schema.validate_schema
 
 
 @pytest.hookimpl(tryfirst=True, hookwrapper=True)
diff --git a/uv.lock b/uv.lock
index 931b6dc..7d624e5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1342,15 +1342,15 @@ wheels = [
 
 [[package]]
 name = "pytest-subtests"
-version = "0.14.1"
+version = "0.13.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "attrs" },
     { name = "pytest" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/c0/4c/ba9eab21a2250c2d46c06c0e3cd316850fde9a90da0ac8d0202f074c6817/pytest_subtests-0.14.1.tar.gz", hash = "sha256:350c00adc36c3aff676a66135c81aed9e2182e15f6c3ec8721366918bbbf7580", size = 17632 }
+sdist = { url = "https://files.pythonhosted.org/packages/67/fe/e691d2f4ce061a475f488cad1ef58431556affea323dde5c764fd7515a70/pytest_subtests-0.13.1.tar.gz", hash = "sha256:989e38f0f1c01bc7c6b2e04db7d9fd859db35d77c2c1a430c831a70cbf3fde2d", size = 15936 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a9/b7/7ca948d35642ae72500efda6ba6fa61dcb6683feb596d19c4747c63c0789/pytest_subtests-0.14.1-py3-none-any.whl", hash = "sha256:e92a780d98b43118c28a16044ad9b841727bd7cb6a417073b38fd2d7ccdf052d", size = 8833 },
+    { url = "https://files.pythonhosted.org/packages/f5/ac/fc132cb88e8f2042cebcb6ef0ffac40017c514fbadf3931e0b4bcb4bdfb6/pytest_subtests-0.13.1-py3-none-any.whl", hash = "sha256:ab616a22f64cd17c1aee65f18af94dbc30c444f8683de2b30895c3778265e3bd", size = 8038 },
 ]
 
 [[package]]
@@ -1669,7 +1669,7 @@ wheels = [
 
 [[package]]
 name = "schemathesis"
-version = "3.39.14"
+version = "3.37.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "backoff" },
@@ -1694,9 +1694,9 @@ dependencies = [
     { name = "werkzeug" },
     { name = "yarl" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/0d/82/910978b34e32394037c476acf91c0ce8844f55a35f621e73e9eba5f197a6/schemathesis-3.39.14.tar.gz", hash = "sha256:131e74fea4871e01eb0d1f54278932e1284f83205a88f198ebdf7dd0b1814b36", size = 57910047 }
+sdist = { url = "https://files.pythonhosted.org/packages/66/94/4c76a7621d01562d6157be4f339a2c7a5827c091267b64750c1026fd5657/schemathesis-3.37.0.tar.gz", hash = "sha256:0333141cba48f8a9fc15894d57078b1baaac36e2582199113899840685005dfa", size = 57891641 }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/8f/54/5cf43bfd34eb597f6eccc87bbd94da4d86a4d64f53ee65420360d1136f0a/schemathesis-3.39.14-py3-none-any.whl", hash = "sha256:b0089e8f169c3bcd168d9a1e3cb8669dfd7597af0c5c096e3bab9b7a01ada304", size = 332145 },
+    { url = "https://files.pythonhosted.org/packages/15/f1/d8dca3a77bbf6cd1ac9b931ce83cdc426b3519beb10156338abd69ab9273/schemathesis-3.37.0-py3-none-any.whl", hash = "sha256:9a7c4f8c2a855c6fa8fa36eba80977d7cbc21157b18d2c6297e264b74e2daeba", size = 321643 },
 ]
 
 [[package]]
@@ -1749,6 +1749,7 @@ dependencies = [
     { name = "pygeofilter" },
     { name = "pyrfc3339" },
     { name = "returns" },
+    { name = "schemathesis" },
     { name = "types-pyrfc3339" },
     { name = "uvicorn" },
 ]
@@ -1764,6 +1765,7 @@ requires-dist = [
     { name = "pygeofilter", specifier = ">=0.2" },
     { name = "pyrfc3339", specifier = ">=1.1" },
     { name = "returns", specifier = ">=0.23" },
+    { name = "schemathesis", specifier = "==3.37.0" },
     { name = "types-pyrfc3339", specifier = ">=1.1.1" },
     { name = "uvicorn", specifier = ">=0.29.0" },
 ]