Fix for JSON array parsing in multipart/form-data (#1869) (#1872)

Fixes #1869 .



Changes proposed in this pull request:

- Prioritise parsing JSON over splitting array

---------

Co-authored-by: Alex Fechner <alex.fechner@stryker.com>

tests/test_json_validation.py

@@ -128,3 +128,27 @@ def test_multipart_form_json(json_validation_spec_dir, spec, app_class):
     assert res.status_code == 200
     assert res.json()["name"] == "joe-reply"
     assert res.json()["age"] == 30
+
+
+@pytest.mark.parametrize("spec", ["openapi.yaml"])
+def test_multipart_form_json_array(json_validation_spec_dir, spec, app_class):
+    app = build_app_from_fixture(
+        json_validation_spec_dir,
+        app_class=app_class,
+        spec_file=spec,
+        validate_responses=True,
+    )
+    app_client = app.test_client()
+
+    res = app_client.post(
+        "/v1.0/multipart_form_json_array",
+        files={"file": b""},  # Force multipart/form-data content-type
+        data={
+            "x": json.dumps([{"name": "joe", "age": 20}, {"name": "alena", "age": 28}])
+        },
+    )
+    assert res.status_code == 200
+    assert res.json()[0]["name"] == "joe-reply"
+    assert res.json()[0]["age"] == 30
+    assert res.json()[1]["name"] == "alena-reply"
+    assert res.json()[1]["age"] == 38