Merge branch 'main' into dependabot/pip/sentry-sdk-0.20.3

Signed-off-by: Hassan Abouelela <[email protected]>

# Conflicts:
#	poetry.lock

13 files changed, 443 insertions, 153 deletions

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 483fdc7..3fa665c 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -1,2 +1,2 @@
-# Request joe and ks123 for all PRs.
-* @jb3 @ks129
+# Request joe, ks123, HassanAbouelela for all PRs.
+* @jb3 @ks129 @HassanAbouelela
diff --git a/README.md b/README.md
index 3e38ef5..be0c8b9 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ To start working on forms-backend, you'll need few things:
 2. Poetry
 3. Docker and docker-compose (optional)
 4. Running MongoDB instance (when not using Docker)
+5. Running [Snekbox](https://git.pydis.com/snekbox) instance (when not using Docker, optional)
 
 ### Running with Docker
 The easiest way to run forms-backend is using Docker (and docker-compose).
@@ -29,6 +30,7 @@ Create a `.env` file with the same contents as the Docker section above and the
 - `FRONTEND_URL`: Forms frontend URL.
 - `DATABASE_URL`: MongoDB instance URI, in format `mongodb://(username):(password)@(database IP or domain):(port)`.
 - `MONGO_DB`: MongoDB database name, defaults to `pydis_forms`.
+- `SNEKBOX_URL`: Snekbox evaluation endpoint.
 
 #### Running
 Simply run: `$ uvicorn --reload --host 0.0.0.0 --debug backend:app`.
diff --git a/SCHEMA.md b/SCHEMA.md
index 6aae7d6..ada828e 100644
--- a/SCHEMA.md
+++ b/SCHEMA.md
@@ -123,7 +123,12 @@ Textareas require no additional configuration.
 ```js
 {
     // A supported language from https://prismjs.com/#supported-languages
-    "language": "python"
+    "language": "python",
+    // An optinal mapping of unit tests
+    "unittests": {
+        "unit_1": "unit_code()",
+        ...
+    }
 }
 ```
 
diff --git a/backend/constants.py b/backend/constants.py
index fedab64..59b56e0 100644
--- a/backend/constants.py
+++ b/backend/constants.py
@@ -1,14 +1,15 @@
 from dotenv import load_dotenv
-load_dotenv()
+import os
+import binascii
+from enum import Enum
 
-import os  # noqa
-import binascii  # noqa
-from enum import Enum  # noqa
+load_dotenv()
 
 
 FRONTEND_URL = os.getenv("FRONTEND_URL", "https://forms.pythondiscord.com")
 DATABASE_URL = os.getenv("DATABASE_URL")
 MONGO_DATABASE = os.getenv("MONGO_DATABASE", "pydis_forms")
+SNEKBOX_URL = os.getenv("SNEKBOX_URL", "http://snekbox.default.svc.cluster.local/eval")
 
 OAUTH2_CLIENT_ID = os.getenv("OAUTH2_CLIENT_ID")
 OAUTH2_CLIENT_SECRET = os.getenv("OAUTH2_CLIENT_SECRET")
diff --git a/backend/models/form.py b/backend/models/form.py
index 8e59905..eac0b63 100644
--- a/backend/models/form.py
+++ b/backend/models/form.py
@@ -47,7 +47,7 @@ class Form(BaseModel):
         if any(v not in allowed_values for v in value):
             raise ValueError("Form features list contains one or more invalid values.")
 
-        if FormFeatures.COLLECT_EMAIL in value and FormFeatures.REQUIRES_LOGIN not in value:  # noqa
+        if FormFeatures.COLLECT_EMAIL in value and FormFeatures.REQUIRES_LOGIN not in value:
             raise ValueError("COLLECT_EMAIL feature require REQUIRES_LOGIN feature.")
 
         return value
diff --git a/backend/routes/forms/form.py b/backend/routes/forms/form.py
index b6b722e..dd1c83f 100644
--- a/backend/routes/forms/form.py
+++ b/backend/routes/forms/form.py
@@ -10,6 +10,7 @@ from starlette.responses import JSONResponse
 
 from backend.models import Form
 from backend.route import Route
+from backend.routes.forms.unittesting import filter_unittests
 from backend.validation import ErrorMessage, OkayResponse, api
 
 
@@ -26,7 +27,7 @@ class SingleForm(Route):
     @api.validate(resp=Response(HTTP_200=Form, HTTP_404=ErrorMessage), tags=["forms"])
     async def get(self, request: Request) -> JSONResponse:
         """Returns single form information by ID."""
-        admin = request.user.payload["admin"] if request.user.is_authenticated else False  # noqa
+        admin = request.user.payload["admin"] if request.user.is_authenticated else False
 
         filters = {
             "_id": request.path_params["form_id"]
@@ -37,6 +38,9 @@ class SingleForm(Route):
 
         if raw_form := await request.state.db.forms.find_one(filters):
             form = Form(**raw_form)
+            if not admin:
+                form = filter_unittests(form)
+
             return JSONResponse(form.dict(admin=admin))
 
         return JSONResponse({"error": "not_found"}, status_code=404)
diff --git a/backend/routes/forms/submit.py b/backend/routes/forms/submit.py
index d8e6d35..b3a6afd 100644
--- a/backend/routes/forms/submit.py
+++ b/backend/routes/forms/submit.py
@@ -18,6 +18,7 @@ from starlette.responses import JSONResponse
 from backend.constants import FRONTEND_URL, FormFeatures, HCAPTCHA_API_SECRET
 from backend.models import Form, FormResponse
 from backend.route import Route
+from backend.routes.forms.unittesting import execute_unittest
 from backend.validation import AuthorizationHeaders, ErrorMessage, api
 
 HCAPTCHA_VERIFY_URL = "https://hcaptcha.com/siteverify"
@@ -99,7 +100,10 @@ class SubmitForm(Route):
                 if request.user.is_authenticated:
                     response["user"] = request.user.payload
 
-                    if FormFeatures.COLLECT_EMAIL.value in form.features and "email" not in response["user"]:  # noqa
+                    if (
+                            FormFeatures.COLLECT_EMAIL.value in form.features
+                            and "email" not in response["user"]
+                    ):
                         return JSONResponse({
                             "error": "email_required"
                         }, status_code=400)
@@ -127,6 +131,23 @@ class SubmitForm(Route):
             except ValidationError as e:
                 return JSONResponse(e.errors(), status_code=422)
 
+            # Run unittests if needed
+            if any("unittests" in question.data for question in form.questions):
+                unittest_results = await execute_unittest(response_obj, form)
+
+                if not all(test.passed for test in unittest_results):
+                    # Return 500 if we encountered an internal error (code 99).
+                    status_code = 500 if any(
+                        test.return_code == 99 for test in unittest_results
+                    ) else 403
+
+                    return JSONResponse({
+                        "error": "failed_tests",
+                        "test_results": [
+                            test._asdict() for test in unittest_results if not test.passed
+                        ]
+                    }, status_code=status_code)
+
             await request.state.db.responses.insert_one(
                 response_obj.dict(by_alias=True)
             )
@@ -172,7 +193,7 @@ class SubmitForm(Route):
         embed = {
             "title": "New Form Response",
             "description": f"{mention} submitted a response to `{form.name}`.",
-            "url": f"{FRONTEND_URL}/path_to_view_form/{response.id}",  # noqa # TODO: Enter Form View URL
+            "url": f"{FRONTEND_URL}/path_to_view_form/{response.id}",  # TODO: Enter Form View URL
             "timestamp": response.timestamp,
             "color": 7506394,
         }
diff --git a/backend/routes/forms/unittesting.py b/backend/routes/forms/unittesting.py
new file mode 100644
index 0000000..3854314
--- /dev/null
+++ b/backend/routes/forms/unittesting.py
@@ -0,0 +1,127 @@
+import base64
+from collections import namedtuple
+from itertools import count
+from textwrap import indent
+
+import httpx
+from httpx import HTTPStatusError
+
+from backend.constants import SNEKBOX_URL
+from backend.models import FormResponse, Form
+
+with open("resources/unittest_template.py") as file:
+    TEST_TEMPLATE = file.read()
+
+
+UnittestResult = namedtuple("UnittestResult", "question_id return_code passed result")
+
+
+def filter_unittests(form: Form) -> Form:
+    """
+    Replace the unittest data section of code questions with the number of test cases.
+
+    This is used to redact the exact tests when sending the form back to the frontend.
+    """
+    for question in form.questions:
+        if question.type == "code" and "unittests" in question.data:
+            question.data["unittests"] = len(question.data["unittests"])
+
+    return form
+
+
+def _make_unit_code(units: dict[str, str]) -> str:
+    """Compose a dict mapping unit names to their code into an actual class body."""
+    result = ""
+
+    for unit_name, unit_code in units.items():
+        result += (
+            f"\ndef test_{unit_name.lstrip('#')}(unit):"  # Function definition
+            f"\n{indent(unit_code, '    ')}"  # Unit code
+        )
+
+    return indent(result, "    ")
+
+
+def _make_user_code(code: str) -> str:
+    """Compose the user code into an actual base64-encoded string variable."""
+    code = base64.b64encode(code.encode("utf8")).decode("utf8")
+    return f'USER_CODE = b"{code}"'
+
+
+async def _post_eval(code: str) -> dict[str, str]:
+    """Post the eval to snekbox and return the response."""
+    async with httpx.AsyncClient() as client:
+        data = {"input": code}
+        response = await client.post(SNEKBOX_URL, json=data, timeout=10)
+
+        response.raise_for_status()
+        return response.json()
+
+
+async def execute_unittest(form_response: FormResponse, form: Form) -> list[UnittestResult]:
+    """Execute all the unittests in this form and return the results."""
+    unittest_results = []
+
+    for question in form.questions:
+        if question.type == "code" and "unittests" in question.data:
+            passed = False
+
+            # Tests starting with an hashtag should have censored names.
+            hidden_test_counter = count(1)
+            hidden_tests = {
+                test.lstrip("#").lstrip("test_"): next(hidden_test_counter)
+                for test in question.data["unittests"].keys()
+                if test.startswith("#")
+            }
+
+            # Compose runner code
+            unit_code = _make_unit_code(question.data["unittests"])
+            user_code = _make_user_code(form_response.response[question.id])
+
+            code = TEST_TEMPLATE.replace("### USER CODE", user_code)
+            code = code.replace("### UNIT CODE", unit_code)
+
+            try:
+                response = await _post_eval(code)
+            except HTTPStatusError:
+                return_code = 99
+                result = "Unable to contact code runner."
+            else:
+                return_code = int(response["returncode"])
+
+                # Parse the stdout if the tests ran successfully
+                if return_code == 0:
+                    stdout = response["stdout"]
+                    passed = bool(int(stdout[0]))
+
+                    # If the test failed, we have to populate the result string.
+                    if not passed:
+                        failed_tests = stdout[1:].strip().split(";")
+
+                        # Redact failed hidden tests
+                        for i, failed_test in enumerate(failed_tests.copy()):
+                            if failed_test in hidden_tests:
+                                failed_tests[i] = f"hidden_test_{hidden_tests[failed_test]}"
+
+                        result = ";".join(failed_tests)
+                    else:
+                        result = ""
+                elif return_code in (5, 6, 99):
+                    result = response["stdout"]
+                # Killed by NsJail
+                elif return_code == 137:
+                    return_code = 7
+                    result = "Timed out or ran out of memory."
+                # Another code has been returned by CPython because of another failure.
+                else:
+                    return_code = 99
+                    result = "Internal error."
+
+            unittest_results.append(UnittestResult(
+                question_id=question.id,
+                return_code=return_code,
+                passed=passed,
+                result=result
+            ))
+
+    return unittest_results
diff --git a/docker-compose.yml b/docker-compose.yml
index d44b4e0..4e58ef7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -10,6 +10,13 @@ services:
       MONGO_INITDB_ROOT_PASSWORD: forms-backend
       MONGO_INITDB_DATABASE: pydis_forms
 
+  snekbox:
+    image: ghcr.io/python-discord/snekbox:latest
+    ipc: none
+    ports:
+      - "127.0.0.1:8060:8060"
+    privileged: true
+
   backend:
     build:
       context: .
@@ -19,11 +26,13 @@ services:
       - "127.0.0.1:8000:8000"
     depends_on:
       - mongo
+      - snekbox
     tty: true
     volumes:
       - .:/app:ro
     environment:
       - DATABASE_URL=mongodb://forms-backend:forms-backend@mongo:27017
+      - SNEKBOX_URL=http://snekbox:8060/eval
       - OAUTH2_CLIENT_ID
       - OAUTH2_CLIENT_SECRET
       - ALLOWED_URL
diff --git a/poetry.lock b/poetry.lock
index 6215fc8..7ad8db8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -70,15 +70,15 @@ tornado = ["tornado (>=0.2)"]
 
 [[package]]
 name = "h11"
-version = "0.11.0"
+version = "0.12.0"
 description = "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "httpcore"
-version = "0.12.2"
+version = "0.12.3"
 description = "A minimal low-level HTTP client."
 category = "main"
 optional = false
@@ -122,11 +122,11 @@ http2 = ["h2 (>=3.0.0,<4.0.0)"]
 
 [[package]]
 name = "idna"
-version = "2.10"
+version = "3.1"
 description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+python-versions = ">=3.4"
 
 [[package]]
 name = "mccabe"
@@ -165,16 +165,18 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pydantic"
-version = "1.7.3"
+version = "1.8"
 description = "Data validation and settings management using python 3.6 type hinting"
 category = "main"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+typing-extensions = ">=3.7.4.3"
 
 [package.extras]
 dotenv = ["python-dotenv (>=0.10.4)"]
 email = ["email-validator (>=1.0.3)"]
-typing_extensions = ["typing-extensions (>=3.7.2)"]
 
 [[package]]
 name = "pyflakes"
@@ -200,7 +202,7 @@ tests = ["pytest (>=6.0.0,<7.0.0)", "coverage[toml] (==5.0.4)"]
 
 [[package]]
 name = "pymongo"
-version = "3.11.2"
+version = "3.11.3"
 description = "Python driver for MongoDB <http://www.mongodb.org>"
 category = "main"
 optional = false
@@ -229,11 +231,11 @@ cli = ["click (>=5.0)"]
 
 [[package]]
 name = "pyyaml"
-version = "5.3.1"
+version = "5.4.1"
 description = "YAML parser and emitter for Python"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
 
 [[package]]
 name = "rfc3986"
@@ -314,8 +316,16 @@ python-versions = ">=3.6"
 full = ["aiofiles", "graphene", "itsdangerous", "jinja2", "python-multipart", "pyyaml", "requests"]
 
 [[package]]
+name = "typing-extensions"
+version = "3.7.4.3"
+description = "Backported and Experimental Type Hints for Python 3.5+"
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
 name = "urllib3"
-version = "1.26.2"
+version = "1.26.3"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "main"
 optional = false
@@ -328,7 +338,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
 name = "uvicorn"
-version = "0.13.3"
+version = "0.13.4"
 description = "The lightning-fast ASGI server."
 category = "main"
 optional = false
@@ -341,24 +351,29 @@ h11 = ">=0.8"
 httptools = {version = ">=0.1.0,<0.2.0", optional = true, markers = "sys_platform != \"win32\" and sys_platform != \"cygwin\" and platform_python_implementation != \"PyPy\" and extra == \"standard\""}
 python-dotenv = {version = ">=0.13", optional = true, markers = "extra == \"standard\""}
 PyYAML = {version = ">=5.1", optional = true, markers = "extra == \"standard\""}
-uvloop = {version = ">=0.14.0", optional = true, markers = "sys_platform != \"win32\" and sys_platform != \"cygwin\" and platform_python_implementation != \"PyPy\" and extra == \"standard\""}
-watchgod = {version = ">=0.6,<0.7", optional = true, markers = "extra == \"standard\""}
+uvloop = {version = ">=0.14.0,<0.15.0 || >0.15.0,<0.15.1 || >0.15.1", optional = true, markers = "sys_platform != \"win32\" and sys_platform != \"cygwin\" and platform_python_implementation != \"PyPy\" and extra == \"standard\""}
+watchgod = {version = ">=0.6", optional = true, markers = "extra == \"standard\""}
 websockets = {version = ">=8.0.0,<9.0.0", optional = true, markers = "extra == \"standard\""}
 
 [package.extras]
-standard = ["websockets (>=8.0.0,<9.0.0)", "watchgod (>=0.6,<0.7)", "python-dotenv (>=0.13)", "PyYAML (>=5.1)", "httptools (>=0.1.0,<0.2.0)", "uvloop (>=0.14.0)", "colorama (>=0.4)"]
+standard = ["websockets (>=8.0.0,<9.0.0)", "watchgod (>=0.6)", "python-dotenv (>=0.13)", "PyYAML (>=5.1)", "httptools (>=0.1.0,<0.2.0)", "uvloop (>=0.14.0,!=0.15.0,!=0.15.1)", "colorama (>=0.4)"]
 
 [[package]]
 name = "uvloop"
-version = "0.14.0"
+version = "0.15.2"
 description = "Fast implementation of asyncio event loop on top of libuv"
 category = "main"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
+
+[package.extras]
+dev = ["Cython (>=0.29.20,<0.30.0)", "pytest (>=3.6.0)", "Sphinx (>=1.7.3,<1.8.0)", "sphinxcontrib-asyncio (>=0.2.0,<0.3.0)", "sphinx-rtd-theme (>=0.2.4,<0.3.0)", "aiohttp", "flake8 (>=3.8.4,<3.9.0)", "psutil", "pycodestyle (>=2.6.0,<2.7.0)", "pyOpenSSL (>=19.0.0,<19.1.0)", "mypy (>=0.800)"]
+docs = ["Sphinx (>=1.7.3,<1.8.0)", "sphinxcontrib-asyncio (>=0.2.0,<0.3.0)", "sphinx-rtd-theme (>=0.2.4,<0.3.0)"]
+test = ["aiohttp", "flake8 (>=3.8.4,<3.9.0)", "psutil", "pycodestyle (>=2.6.0,<2.7.0)", "pyOpenSSL (>=19.0.0,<19.1.0)", "mypy (>=0.800)"]
 
 [[package]]
 name = "watchgod"
-version = "0.6"
+version = "0.7"
 description = "Simple, modern file watching and code reload in python."
 category = "main"
 optional = false
@@ -375,7 +390,7 @@ python-versions = ">=3.6.1"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "485f3dc122d07dd949f996bbfa46c492246c1e919a35f793ba0bacf7b02c4580"
+content-hash = "6b8eeff310eac53dd82204deba49623f8d7a29e3292104f11647eabea218ac02"
 
 [metadata.files]
 certifi = [
@@ -407,12 +422,12 @@ gunicorn = [
     {file = "gunicorn-20.0.4.tar.gz", hash = "sha256:1904bb2b8a43658807108d59c3f3d56c2b6121a701161de0ddf9ad140073c626"},
 ]
 h11 = [
-    {file = "h11-0.11.0-py2.py3-none-any.whl", hash = "sha256:ab6c335e1b6ef34b205d5ca3e228c9299cc7218b049819ec84a388c2525e5d87"},
-    {file = "h11-0.11.0.tar.gz", hash = "sha256:3c6c61d69c6f13d41f1b80ab0322f1872702a3ba26e12aa864c928f6a43fbaab"},
+    {file = "h11-0.12.0-py3-none-any.whl", hash = "sha256:36a3cb8c0a032f56e2da7084577878a035d3b61d104230d4bd49c0c6b555a9c6"},
+    {file = "h11-0.12.0.tar.gz", hash = "sha256:47222cb6067e4a307d535814917cd98fd0a57b6788ce715755fa2b6c28b56042"},
 ]
 httpcore = [
-    {file = "httpcore-0.12.2-py3-none-any.whl", hash = "sha256:420700af11db658c782f7e8fda34f9dcd95e3ee93944dd97d78cb70247e0cd06"},
-    {file = "httpcore-0.12.2.tar.gz", hash = "sha256:dd1d762d4f7c2702149d06be2597c35fb154c5eff9789a8c5823fbcf4d2978d6"},
+    {file = "httpcore-0.12.3-py3-none-any.whl", hash = "sha256:93e822cd16c32016b414b789aeff4e855d0ccbfc51df563ee34d4dbadbb3bcdc"},
+    {file = "httpcore-0.12.3.tar.gz", hash = "sha256:37ae835fb370049b2030c3290e12ed298bf1473c41bb72ca4aa78681eba9b7c9"},
 ]
 httptools = [
     {file = "httptools-0.1.1-cp35-cp35m-macosx_10_13_x86_64.whl", hash = "sha256:a2719e1d7a84bb131c4f1e0cb79705034b48de6ae486eb5297a139d6a3296dce"},
@@ -433,8 +448,8 @@ httpx = [
     {file = "httpx-0.16.1.tar.gz", hash = "sha256:126424c279c842738805974687e0518a94c7ae8d140cd65b9c4f77ac46ffa537"},
 ]
 idna = [
-    {file = "idna-2.10-py2.py3-none-any.whl", hash = "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"},
-    {file = "idna-2.10.tar.gz", hash = "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6"},
+    {file = "idna-3.1-py3-none-any.whl", hash = "sha256:5205d03e7bcbb919cc9c19885f9920d622ca52448306f2377daede5cf3faac16"},
+    {file = "idna-3.1.tar.gz", hash = "sha256:c5b02147e01ea9920e6b0a3f1f7bb833612d507592c837a6c49552768f4054e1"},
 ]
 mccabe = [
     {file = "mccabe-0.6.1-py2.py3-none-any.whl", hash = "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42"},
@@ -452,28 +467,28 @@ pycodestyle = [
     {file = "pycodestyle-2.6.0.tar.gz", hash = "sha256:c58a7d2815e0e8d7972bf1803331fb0152f867bd89adf8a01dfd55085434192e"},
 ]
 pydantic = [
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+    {file = "PyYAML-5.4.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:8c1be557ee92a20f184922c7b6424e8ab6691788e6d86137c5d93c1a6ec1b8fb"},
+    {file = "PyYAML-5.4.1-cp38-cp38-win32.whl", hash = "sha256:fa5ae20527d8e831e8230cbffd9f8fe952815b2b7dae6ffec25318803a7528fc"},
+    {file = "PyYAML-5.4.1-cp38-cp38-win_amd64.whl", hash = "sha256:0f5f5786c0e09baddcd8b4b45f20a7b5d61a7e7e99846e3c799b05c7c53fa696"},
+    {file = "PyYAML-5.4.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:294db365efa064d00b8d1ef65d8ea2c3426ac366c0c4368d930bf1c5fb497f77"},
+    {file = "PyYAML-5.4.1-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:74c1485f7707cf707a7aef42ef6322b8f97921bd89be2ab6317fd782c2d53183"},
+    {file = "PyYAML-5.4.1-cp39-cp39-win32.whl", hash = "sha256:49d4cdd9065b9b6e206d0595fee27a96b5dd22618e7520c33204a4a3239d5b10"},
+    {file = "PyYAML-5.4.1-cp39-cp39-win_amd64.whl", hash = "sha256:c20cfa2d49991c8b4147af39859b167664f2ad4561704ee74c1de03318e898db"},
+    {file = "PyYAML-5.4.1.tar.gz", hash = "sha256:607774cbba28732bfa802b54baa7484215f530991055bb562efbed5b2f20a45e"},
 ]
 rfc3986 = [
     {file = "rfc3986-1.4.0-py2.py3-none-any.whl", hash = "sha256:af9147e9aceda37c91a05f4deb128d4b4b49d6b199775fd2d2927768abdc8f50"},
@@ -588,28 +611,34 @@ starlette = [
     {file = "starlette-0.14.2-py3-none-any.whl", hash = "sha256:3c8e48e52736b3161e34c9f0e8153b4f32ec5d8995a3ee1d59410d92f75162ed"},
     {file = "starlette-0.14.2.tar.gz", hash = "sha256:7d49f4a27f8742262ef1470608c59ddbc66baf37c148e938c7038e6bc7a998aa"},
 ]
+typing-extensions = [
+    {file = "typing_extensions-3.7.4.3-py2-none-any.whl", hash = "sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f"},
+    {file = "typing_extensions-3.7.4.3-py3-none-any.whl", hash = "sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918"},
+    {file = "typing_extensions-3.7.4.3.tar.gz", hash = "sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c"},
+]
 urllib3 = [
-    {file = "urllib3-1.26.2-py2.py3-none-any.whl", hash = "sha256:d8ff90d979214d7b4f8ce956e80f4028fc6860e4431f731ea4a8c08f23f99473"},
-    {file = "urllib3-1.26.2.tar.gz", hash = "sha256:19188f96923873c92ccb987120ec4acaa12f0461fa9ce5d3d0772bc965a39e08"},
+    {file = "urllib3-1.26.3-py2.py3-none-any.whl", hash = "sha256:1b465e494e3e0d8939b50680403e3aedaa2bc434b7d5af64dfd3c958d7f5ae80"},
+    {file = "urllib3-1.26.3.tar.gz", hash = "sha256:de3eedaad74a2683334e282005cd8d7f22f4d55fa690a2a1020a416cb0a47e73"},
 ]
 uvicorn = [
-    {file = "uvicorn-0.13.3-py3-none-any.whl", hash = "sha256:1079c50a06f6338095b4f203e7861dbff318dde5f22f3a324fc6e94c7654164c"},
-    {file = "uvicorn-0.13.3.tar.gz", hash = "sha256:ef1e0bb5f7941c6fe324e06443ddac0331e1632a776175f87891c7bd02694355"},
+    {file = "uvicorn-0.13.4-py3-none-any.whl", hash = "sha256:7587f7b08bd1efd2b9bad809a3d333e972f1d11af8a5e52a9371ee3a5de71524"},
+    {file = "uvicorn-0.13.4.tar.gz", hash = "sha256:3292251b3c7978e8e4a7868f4baf7f7f7bb7e40c759ecc125c37e99cdea34202"},
 ]
 uvloop = [
-    {file = "uvloop-0.14.0-cp35-cp35m-macosx_10_11_x86_64.whl", hash = "sha256:08b109f0213af392150e2fe6f81d33261bb5ce968a288eb698aad4f46eb711bd"},
-    {file = "uvloop-0.14.0-cp35-cp35m-manylinux2010_x86_64.whl", hash = "sha256:4544dcf77d74f3a84f03dd6278174575c44c67d7165d4c42c71db3fdc3860726"},
-    {file = "uvloop-0.14.0-cp36-cp36m-macosx_10_11_x86_64.whl", hash = "sha256:b4f591aa4b3fa7f32fb51e2ee9fea1b495eb75b0b3c8d0ca52514ad675ae63f7"},
-    {file = "uvloop-0.14.0-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:f07909cd9fc08c52d294b1570bba92186181ca01fe3dc9ffba68955273dd7362"},
-    {file = "uvloop-0.14.0-cp37-cp37m-macosx_10_11_x86_64.whl", hash = "sha256:afd5513c0ae414ec71d24f6f123614a80f3d27ca655a4fcf6cabe50994cc1891"},
-    {file = "uvloop-0.14.0-cp37-cp37m-manylinux2010_x86_64.whl", hash = "sha256:e7514d7a48c063226b7d06617cbb12a14278d4323a065a8d46a7962686ce2e95"},
-    {file = "uvloop-0.14.0-cp38-cp38-macosx_10_11_x86_64.whl", hash = "sha256:bcac356d62edd330080aed082e78d4b580ff260a677508718f88016333e2c9c5"},
-    {file = "uvloop-0.14.0-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:4315d2ec3ca393dd5bc0b0089d23101276778c304d42faff5dc4579cb6caef09"},
-    {file = "uvloop-0.14.0.tar.gz", hash = "sha256:123ac9c0c7dd71464f58f1b4ee0bbd81285d96cdda8bc3519281b8973e3a461e"},
+    {file = "uvloop-0.15.2-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:19fa1d56c91341318ac5d417e7b61c56e9a41183946cc70c411341173de02c69"},
+    {file = "uvloop-0.15.2-cp37-cp37m-manylinux2010_x86_64.whl", hash = "sha256:e5e5f855c9bf483ee6cd1eb9a179b740de80cb0ae2988e3fa22309b78e2ea0e7"},
+    {file = "uvloop-0.15.2-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:42eda9f525a208fbc4f7cecd00fa15c57cc57646c76632b3ba2fe005004f051d"},
+    {file = "uvloop-0.15.2-cp38-cp38-macosx_10_14_x86_64.whl", hash = "sha256:90e56f17755e41b425ad19a08c41dc358fa7bf1226c0f8e54d4d02d556f7af7c"},
+    {file = "uvloop-0.15.2-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:7ae39b11a5f4cec1432d706c21ecc62f9e04d116883178b09671aa29c46f7a47"},
+    {file = "uvloop-0.15.2-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:b45218c99795803fb8bdbc9435ff7f54e3a591b44cd4c121b02fa83affb61c7c"},
+    {file = "uvloop-0.15.2-cp39-cp39-macosx_10_14_x86_64.whl", hash = "sha256:114543c84e95df1b4ff546e6e3a27521580466a30127f12172a3278172ad68bc"},
+    {file = "uvloop-0.15.2-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:44cac8575bf168601424302045234d74e3561fbdbac39b2b54cc1d1d00b70760"},
+    {file = "uvloop-0.15.2-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:6de130d0cb78985a5d080e323b86c5ecaf3af82f4890492c05981707852f983c"},
+    {file = "uvloop-0.15.2.tar.gz", hash = "sha256:2bb0624a8a70834e54dde8feed62ed63b50bad7a1265c40d6403a2ac447bce01"},
 ]
 watchgod = [
-    {file = "watchgod-0.6-py35.py36.py37-none-any.whl", hash = "sha256:59700dab7445aa8e6067a5b94f37bae90fc367554549b1ed2e9d0f4f38a90d2a"},
-    {file = "watchgod-0.6.tar.gz", hash = "sha256:e9cca0ab9c63f17fc85df9fd8bd18156ff00aff04ebe5976cee473f4968c6858"},
+    {file = "watchgod-0.7-py3-none-any.whl", hash = "sha256:d6c1ea21df37847ac0537ca0d6c2f4cdf513562e95f77bb93abbcf05573407b7"},
+    {file = "watchgod-0.7.tar.gz", hash = "sha256:48140d62b0ebe9dd9cf8381337f06351e1f2e70b2203fa9c6eff4e572ca84f29"},
 ]
 websockets = [
     {file = "websockets-8.1-cp36-cp36m-macosx_10_6_intel.whl", hash = "sha256:3762791ab8b38948f0c4d281c8b2ddfa99b7e510e46bd8dfa942a5fff621068c"},
diff --git a/pyproject.toml b/pyproject.toml
index 2413ad4..d58099d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ license = "MIT"
 python = "^3.9"
 starlette = "^0.14.2"
 nested_dict = "^1.61"
-uvicorn = {extras = ["standard"], version = "^0.13.0"}
+uvicorn = {extras = ["standard"], version = "^0.13.4"}
 motor = "^2.3.1"
 python-dotenv = "^0.15.0"
 pyjwt = "^2.0.1"
diff --git a/resources/unittest_template.py b/resources/unittest_template.py
new file mode 100644
index 0000000..2410278
--- /dev/null
+++ b/resources/unittest_template.py
@@ -0,0 +1,90 @@
+# flake8: noqa
+"""This template is used inside snekbox to evaluate and test user code."""
+import ast
+import base64
+import io
+import os
+import sys
+import traceback
+import unittest
+from itertools import chain
+from types import ModuleType, SimpleNamespace
+from typing import NoReturn
+from unittest import mock
+
+### USER CODE
+
+
+class RunnerTestCase(unittest.TestCase):
+### UNIT CODE
+
+
+def _exit_sandbox(code: int) -> NoReturn:
+    """
+    Exit the sandbox by printing the result to the actual stdout and exit with the provided code.
+
+    Codes:
+    - 0: Executed with success
+    - 5: Syntax error while parsing user code
+    - 6: Uncaught exception while loading user code
+    - 99: Internal error
+
+    137 can also be generated by NsJail when killing the process.
+    """
+    print(RESULT.getvalue(), file=ORIGINAL_STDOUT, end="")
+    sys.exit(code)
+
+
+def _load_user_module() -> ModuleType:
+    """Load the user code into a new module and return it."""
+    code = base64.b64decode(USER_CODE).decode("utf8")
+    try:
+        ast.parse(code, "<input>")
+    except SyntaxError:
+        RESULT.write("".join(traceback.format_exception(*sys.exc_info(), limit=0)))
+        _exit_sandbox(5)
+
+    _module = ModuleType("module")
+    exec(code, _module.__dict__)
+
+    return _module
+
+
+def _main() -> None:
+    suite = unittest.defaultTestLoader.loadTestsFromTestCase(RunnerTestCase)
+    result = suite.run(unittest.TestResult())
+
+    RESULT.write(str(int(result.wasSuccessful())))
+
+    if not result.wasSuccessful():
+        RESULT.write(
+            ";".join(chain(
+                (error[0]._testMethodName.lstrip("test_") for error in result.errors),
+                (failure[0]._testMethodName.lstrip("test_") for failure in result.failures)
+            ))
+        )
+
+    _exit_sandbox(0)
+
+
+try:
+    # Fake file object not writing anything
+    DEVNULL = SimpleNamespace(write=lambda *_: None, flush=lambda *_: None)
+
+    RESULT = io.StringIO()
+    ORIGINAL_STDOUT = sys.stdout
+
+    # stdout/err is patched in order to control what is outputted by the runner
+    sys.stdout = DEVNULL
+    sys.stderr = DEVNULL
+    
+    # Load the user code as a global module variable
+    try:
+        module = _load_user_module()
+    except Exception:
+        RESULT.write("Uncaught exception while loading user code.")
+        _exit_sandbox(6)
+    _main()
+except Exception:
+    RESULT.write("Uncaught exception inside runner.")
+    _exit_sandbox(99)
diff --git a/tox.ini b/tox.ini
index 48a3da6..afb3b34 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,10 @@
 [flake8]
-max-line-length=88
+max-line-length=100
 exclude=.cache,.venv,.git
 docstring-convention=all
 import-order-style=pycharm
 ignore=
     # Type annotations
     ANN101,ANN102
+    # Line breaks
+    W503