Add test for a file being both a CodeSource and a DepsSource

Co-authored-by: Maria Knorps <[email protected]>

Author: jherland

tests/test_traverse_project.py

@@ -259,6 +259,18 @@ class TraverseProjectVector:
         expect_imports_src={"subdir1/notebook.ipynb", "subdir1/script.py"},
         expect_deps_src={"subdir1/setup.cfg"},
     ),
+    TraverseProjectVector(
+        "given_code_and_deps_as_same_dir_with_file_both_dep_and_import__yields_files_within",
+        "mixed_project",
+        code={"subdir2"},
+        deps={"subdir2"},
+        expect_imports_src={
+            "subdir2/notebook.ipynb",
+            "subdir2/script.py",
+            "subdir2/setup.py",
+        },
+        expect_deps_src={"subdir2/setup.py"},
+    ),
     TraverseProjectVector(
         "given_code_and_deps_as_separate_dirs__yields_expected_files",
         "mixed_project",