diff --git a/tests/test_strict_content_type_app_level.py b/tests/test_strict_content_type_app_level.py
new file mode 100644
index 0000000000..42a0821a47
--- /dev/null
+++ b/tests/test_strict_content_type_app_level.py
@@ -0,0 +1,44 @@
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+
+app_default = FastAPI()
+
+
+@app_default.post("/items/")
+async def app_default_post(data: dict):
+    return data
+
+
+app_lax = FastAPI(strict_content_type=False)
+
+
+@app_lax.post("/items/")
+async def app_lax_post(data: dict):
+    return data
+
+
+client_default = TestClient(app_default)
+client_lax = TestClient(app_lax)
+
+
+def test_default_strict_rejects_no_content_type():
+    response = client_default.post("/items/", content='{"key": "value"}')
+    assert response.status_code == 422
+
+
+def test_default_strict_accepts_json_content_type():
+    response = client_default.post("/items/", json={"key": "value"})
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
+
+
+def test_lax_accepts_no_content_type():
+    response = client_lax.post("/items/", content='{"key": "value"}')
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
+
+
+def test_lax_accepts_json_content_type():
+    response = client_lax.post("/items/", json={"key": "value"})
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
diff --git a/tests/test_strict_content_type_nested.py b/tests/test_strict_content_type_nested.py
new file mode 100644
index 0000000000..922d01571a
--- /dev/null
+++ b/tests/test_strict_content_type_nested.py
@@ -0,0 +1,91 @@
+from fastapi import APIRouter, FastAPI
+from fastapi.testclient import TestClient
+
+# Lax app with nested routers, inner overrides to strict
+
+app_nested = FastAPI(strict_content_type=False)  # lax app
+outer_router = APIRouter(prefix="/outer")  # inherits lax from app
+inner_strict = APIRouter(prefix="/strict", strict_content_type=True)
+inner_default = APIRouter(prefix="/default")
+
+
+@inner_strict.post("/items/")
+async def inner_strict_post(data: dict):
+    return data
+
+
+@inner_default.post("/items/")
+async def inner_default_post(data: dict):
+    return data
+
+
+outer_router.include_router(inner_strict)
+outer_router.include_router(inner_default)
+app_nested.include_router(outer_router)
+
+client_nested = TestClient(app_nested)
+
+
+def test_strict_inner_on_lax_app_rejects_no_content_type():
+    response = client_nested.post("/outer/strict/items/", content='{"key": "value"}')
+    assert response.status_code == 422
+
+
+def test_default_inner_inherits_lax_from_app():
+    response = client_nested.post("/outer/default/items/", content='{"key": "value"}')
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
+
+
+def test_strict_inner_accepts_json_content_type():
+    response = client_nested.post("/outer/strict/items/", json={"key": "value"})
+    assert response.status_code == 200
+
+
+def test_default_inner_accepts_json_content_type():
+    response = client_nested.post("/outer/default/items/", json={"key": "value"})
+    assert response.status_code == 200
+
+
+# Strict app -> lax outer router -> strict inner router
+
+app_mixed = FastAPI(strict_content_type=True)
+mixed_outer = APIRouter(prefix="/outer", strict_content_type=False)
+mixed_inner = APIRouter(prefix="/inner", strict_content_type=True)
+
+
+@mixed_outer.post("/items/")
+async def mixed_outer_post(data: dict):
+    return data
+
+
+@mixed_inner.post("/items/")
+async def mixed_inner_post(data: dict):
+    return data
+
+
+mixed_outer.include_router(mixed_inner)
+app_mixed.include_router(mixed_outer)
+
+client_mixed = TestClient(app_mixed)
+
+
+def test_lax_outer_on_strict_app_accepts_no_content_type():
+    response = client_mixed.post("/outer/items/", content='{"key": "value"}')
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
+
+
+def test_strict_inner_on_lax_outer_rejects_no_content_type():
+    response = client_mixed.post("/outer/inner/items/", content='{"key": "value"}')
+    assert response.status_code == 422
+
+
+def test_lax_outer_accepts_json_content_type():
+    response = client_mixed.post("/outer/items/", json={"key": "value"})
+    assert response.status_code == 200
+
+
+def test_strict_inner_on_lax_outer_accepts_json_content_type():
+    response = client_mixed.post("/outer/inner/items/", json={"key": "value"})
+    assert response.status_code == 200
diff --git a/tests/test_strict_content_type_router_level.py b/tests/test_strict_content_type_router_level.py
new file mode 100644
index 0000000000..72a02d6c91
--- /dev/null
+++ b/tests/test_strict_content_type_router_level.py
@@ -0,0 +1,61 @@
+from fastapi import APIRouter, FastAPI
+from fastapi.testclient import TestClient
+
+app = FastAPI()
+
+router_lax = APIRouter(prefix="/lax", strict_content_type=False)
+router_strict = APIRouter(prefix="/strict", strict_content_type=True)
+router_default = APIRouter(prefix="/default")
+
+
+@router_lax.post("/items/")
+async def router_lax_post(data: dict):
+    return data
+
+
+@router_strict.post("/items/")
+async def router_strict_post(data: dict):
+    return data
+
+
+@router_default.post("/items/")
+async def router_default_post(data: dict):
+    return data
+
+
+app.include_router(router_lax)
+app.include_router(router_strict)
+app.include_router(router_default)
+
+client = TestClient(app)
+
+
+def test_lax_router_on_strict_app_accepts_no_content_type():
+    response = client.post("/lax/items/", content='{"key": "value"}')
+    assert response.status_code == 200
+    assert response.json() == {"key": "value"}
+
+
+def test_strict_router_on_strict_app_rejects_no_content_type():
+    response = client.post("/strict/items/", content='{"key": "value"}')
+    assert response.status_code == 422
+
+
+def test_default_router_inherits_strict_from_app():
+    response = client.post("/default/items/", content='{"key": "value"}')
+    assert response.status_code == 422
+
+
+def test_lax_router_accepts_json_content_type():
+    response = client.post("/lax/items/", json={"key": "value"})
+    assert response.status_code == 200
+
+
+def test_strict_router_accepts_json_content_type():
+    response = client.post("/strict/items/", json={"key": "value"})
+    assert response.status_code == 200
+
+
+def test_default_router_accepts_json_content_type():
+    response = client.post("/default/items/", json={"key": "value"})
+    assert response.status_code == 200