Scrollbar and unit tests

Author: elementmerc

.coverage

@@ -0,0 +1,30 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install dependencies
+        run: pip install -e ".[dev]"
+
+      - name: Run tests
+        run: pytest --cov=core --cov-report=xml --cov-fail-under=80
+
+      - name: Upload coverage report
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage.xml

.github/workflows/ci.yml

@@ -4,6 +4,8 @@
 main.spec
 stegcore.egg-info/
 *__pycache__*
-/tests/
+*_qa.py*
 *Zone.Identifier*
-.claude/
+.claude/
+*image_tests.py*
+*experiments/

.gitignore

@@ -30,6 +30,21 @@ stegcore = "main:main"
 # GUI: no console window (Windows: no cmd popup; Linux/macOS: detaches terminal)
 stegcore-gui = "main:main"
 
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0",
+    "pytest-cov>=5.0",
+    "Pillow>=10.0",
+    "numpy>=1.26",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts   = "--cov=core --cov-report=html:htmlcov --cov-report=term-missing --cov-fail-under=90"
+
+[tool.coverage.run]
+omit = ["core/utils.py"]
+
 [tool.setuptools]
 # top-level .py files that are not inside a package directory
 py-modules = ["main", "cli"]