Add test environment for problem 8987d2b1-e121-4474-8cb9-0e4a885fd047-v1

Dockerfile

@@ -0,0 +1,6 @@
+FROM public.ecr.aws/x8v8d7g8/mars-base:latest
+WORKDIR /app
+COPY . .
+RUN pip install -r requirements.txt
+CMD ["/bin/bash"]
+

test.sh

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+#!/bin/bash
+set -e
+
+# Usage: ./test.sh base   # runs baseline tests
+#        ./test.sh new    # runs newly added tests (must fail before solution)
+
+if [[ "$1" == "base" ]]; then
+    # Run only your baseline/existing tests
+    pytest tests/existing_tests.py
+elif [[ "$1" == "new" ]]; then
+    # Run the newly-added tests expected to fail before bugfix
+    pytest tests/test_form_defaults.py
+else
+    echo "Usage: ./test.sh {base|new}"
+    exit 1
+fi

tests/test_form_defaults.py

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+# NOTE: Documentation requirement is not validated by tests; reviewer should check manually.
+
+from fastapi import FastAPI, Form, UploadFile, File
+from fastapi.testclient import TestClient
+
+app = FastAPI()
+
+@app.post("/demo/")
+def demo_endpoint(field: str = Form("default_value")):
+    return {"field": field}
+
+@app.post("/demo_int/")
+def demo_int_endpoint(field: int = Form(42)):
+    return {"field": field}
+
+@app.post("/demo_float/")
+def demo_float_endpoint(field: float = Form(3.14)):
+    return {"field": field}
+
+@app.post("/demo_opt/")
+def demo_opt_endpoint(field: str = Form(None)):
+    return {"field": field}
+
+@app.post("/fileupload/")
+def fileupload_endpoint(file: UploadFile = File(None)):
+    return {"filename": file.filename if file else None}
+
+@app.post("/other/")
+def other_endpoint(foo: str = Form("other")):
+    return {"foo": foo}
+
+client = TestClient(app)
+
+def test_blank_field_uses_default():
+    response = client.post("/demo/", data={"field": ""})
+    assert response.json()["field"] == "default_value"
+
+def test_missing_field_uses_default():
+    response = client.post("/demo/", data={})
+    assert response.json()["field"] == "default_value"
+
+def test_blank_int_field_uses_default():
+    response = client.post("/demo_int/", data={"field": ""})
+    assert response.json()["field"] == 42
+
+def test_missing_int_field_uses_default():
+    response = client.post("/demo_int/", data={})
+    assert response.json()["field"] == 42
+
+def test_blank_float_field_uses_default():
+    response = client.post("/demo_float/", data={"field": ""})
+    assert response.json()["field"] == 3.14
+
+def test_missing_float_field_uses_default():
+    response = client.post("/demo_float/", data={})
+    assert response.json()["field"] == 3.14
+
+def test_optional_field_default_none():
+    response = client.post("/demo_opt/", data={})
+    assert response.json()["field"] is None
+
+def test_blank_optional_field_results_in_none():
+    response = client.post("/demo_opt/", data={"field": ""})
+    assert response.json()["field"] is None
+
+def test_blank_field_multipart_uses_default():
+    response = client.post("/demo/", files={"field": ("", "")})
+    assert response.json()["field"] == "default_value"
+
+def test_missing_field_multipart_uses_default():
+    response = client.post("/demo/", files={})
+    assert response.json()["field"] == "default_value"
+
+def test_multipart_blank_text_field_uses_default():
+    response = client.post("/demo/", data={"field": ""}, files={"dummy": ("filename.txt", "dummycontent")})
+    assert response.json()["field"] == "default_value"
+
+def test_multipart_blank_int_field_uses_default():
+    response = client.post("/demo_int/", data={"field": ""}, files={"dummy": ("file.txt", "dummy")})
+    assert response.json()["field"] == 42
+
+def test_multipart_blank_float_field_uses_default():
+    response = client.post("/demo_float/", data={"field": ""}, files={"dummy": ("file.txt", "dummy")})
+    assert response.json()["field"] == 3.14
+
+def test_blank_uploadfile_defaults_to_none():
+    response = client.post("/fileupload/", files={"file": ("", "")})
+    assert response.json()["filename"] is None
+
+def test_fileupload_actual_upload_works():
+    files = {"file": ("afile.txt", "dummydata")}
+    response = client.post("/fileupload/", files=files)
+    assert response.json()["filename"] == "afile.txt"
+
+def test_json_request_unaffected():
+    response = client.post("/demo/", json={"field": ""})
+    assert response.json()["field"] == ""
+
+def test_json_missing_field_uses_default():
+    response = client.post("/demo/", json={})
+    assert response.json()["field"] == "default_value"
+
+def test_other_request_regression_not_broken():
+    response = client.post("/other/", data={})
+    assert response.json()["foo"] == "other"
+