test: Add basic test

README.md

@@ -8,11 +8,33 @@ from pathlib import Path
 import resvg_py
 from PIL import Image
 
-r = resvg_py.Resvg()
+options = resvg_py.SVGOptions()
+r = resvg_py.Resvg(options)
 
-with Path("resources/examples/svg/simple.svg").open("r") as f:
-    rendered = r.render(f.read(), 120, 120)
+with Path("resources/examples/svg/octocat.svg").open("r") as f:
+    rendered = r.render(f.read(), 400, 400)
     array = rendered.as_array()
     im = Image.fromarray(array)
     im.save("image.png")
+
+```
+
+## Development
+
+### Build
+
+```sh
+maturin develop
+```
+
+### Test
+
+```sh
+pytest
+```
+
+To update the snapshots:
+
+```sh
+pytest --snapshot-update
 ```

pyproject.toml

@@ -16,6 +16,9 @@ dependencies = [
     "Pillow",
 ]
 
+[project.optional-dependencies]
+dev = ["pytest", "pytest-snapshot"]
+
 [tool.maturin]
 python-source = "python"
 features = ["pyo3/extension-module"]
@@ -25,7 +28,8 @@ select = ["ALL"]
 target-version = "py37"
 
 [tool.ruff.isort]
-known-first-party = ["resvg"]
+known-first-party = ["resvg_py"]
 
 [tool.ruff.per-file-ignores]
 "**/*.pyi" = ["D1"]
+"tests/test_*.py" = ["D1"]

resvg_py.pyi

@@ -8,14 +8,14 @@ class SVGOptions:
     def __init__(
         self: SVGOptions,
         *,
-        dpi: float,
-        default_width: float,
-        default_height: float,
-        resources_dir: os.PathLike | None,
+        dpi: float = 96.0,
+        default_width: float = 100.0,
+        default_height: float = 100.0,
+        resources_dir: os.PathLike | None = None,
     ) -> None: ...
 
 class Resvg:
-    def __init__(self: Resvg, options: SVGOptions | None) -> None: ...
+    def __init__(self: Resvg, options: SVGOptions | None = None) -> None: ...
     def render(self: Resvg, svg: str, width: int, height: int) -> RenderedImage: ...
 
 class RenderedImage:

tests/__init__.py

@@ -0,0 +1 @@
+"""Unit tests."""

tests/test_render.py

@@ -0,0 +1,35 @@
+"""Run the resvg-py example."""
+
+from __future__ import annotations
+
+import io
+import typing as t
+from pathlib import Path
+
+import pytest
+from PIL import Image
+
+import resvg_py
+
+if t.TYPE_CHECKING:
+    from pytest_snapshot.plugin import Snapshot
+
+
+@pytest.mark.parametrize(
+    "svg_file",
+    [
+        pytest.param("resources/examples/svg/octocat.svg", id="octocat"),
+    ],
+)
+def test_render(snapshot: Snapshot, svg_file: str) -> None:
+    options = resvg_py.SVGOptions()
+    r = resvg_py.Resvg(options)
+
+    with Path(svg_file).open("r") as input_file:
+        rendered = r.render(input_file.read(), 400, 400)
+        array = rendered.as_array()
+
+        with io.BytesIO() as png_file:
+            im = Image.fromarray(array)
+            im.save(png_file, format="PNG")
+            snapshot.assert_match(png_file.getvalue(), "output.png")