Initial FastAPI project with tests

.gitignore

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+venv/
+__pycache__/
+.pytest_cache/
+*.pyc
+.env

main.py

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+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel
+
+app = FastAPI()
+
+class User(BaseModel):
+    id: int
+    name: str
+    email: str
+
+users_db = []
+
+@app.get("/")
+def health_check():
+    return {"message": "FastAPI is running successfully"}
+
+@app.post("/users", status_code=201)
+def create_user(user: User):
+    if any(u["id"] == user.id for u in users_db):
+        raise HTTPException(status_code=400, detail="User already exists")
+    users_db.append(user.model_dump())
+    return user
+
+@app.get("/users")
+def get_users():
+    return users_db

tests/test_users.py

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+from fastapi.testclient import TestClient
+import sys
+import os
+
+sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+
+from main import app
+
+client = TestClient(app)
+
+def test_create_user():
+    response = client.post(
+        "/users",
+        json={"id": 1, "name": "Tharun", "email": "tharun@test.com"}
+    )
+    assert response.status_code == 201
+    assert response.json()["name"] == "Tharun"
+
+def test_get_users():
+    response = client.get("/users")
+    assert response.status_code == 200
+    assert isinstance(response.json(), list)
+
+def test_duplicate_user_not_allowed():
+    response = client.post(
+        "/users",
+        json={"id": 1, "name": "Duplicate", "email": "dup@test.com"}
+    )
+    assert response.status_code == 400