feat: introduce import linter

Goal: The different file formats should not depend on each other

.github/workflows/lint_and_run_tests.yml

@@ -48,6 +48,9 @@ jobs:
       - name: Run mypy
         run: uv run python -m mypy src/ tests/
 
+      - name: Run import linter
+        run: uv run lint-imports
+
   test:
     runs-on: ${{ matrix.os }}
     if: |

.importlinter

@@ -0,0 +1,18 @@
+# SPDX-FileCopyrightText: TNG Technology Consulting GmbH <https://www.tngtech.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+[importlinter]
+root_package = opossum_lib
+# Optional:
+include_external_packages = True
+exclude_type_checking_imports = True
+
+[importlinter:contract:file-formats-independent]
+name = The different file formats should be independent
+type = independence
+modules =
+    opossum_lib.opossum
+    opossum_lib.scancode
+ignore_imports =
+    ** -> opossum_lib.core.opossum_model

pyproject.toml

@@ -12,7 +12,6 @@ dependencies = [
     "click>=8.1.8,<9",
     "pydantic>=2.10.6",
     "pyinstaller>=6.11.1",
-    "faker>=35.0.0",
 ]
 
 [project.urls]
@@ -22,11 +21,12 @@ Repository = "https://github.com/opossum-tool/opossum-file"
 opossum-file = "opossum_lib.cli:opossum_file"
 
 [dependency-groups]
-test = ["pytest>=8.3.4,<9"]
+test = ["pytest>=8.3.4,<9", "faker>=35.0.0",]
 dev = [
     "mypy>=1.14.1,<2",
     "pre-commit>=4.1.0,<5",
     "ruff>=0.9.3",
+    "import-linter>=2.1",
 ]
 
 [tool.uv]