From fe019a002224fbfbf7d1c79f53237981c307bbe7 Mon Sep 17 00:00:00 2001
From: Matthias Friedrich <matt@mafr.de>
Date: Tue, 16 Dec 2025 19:12:05 +0100
Subject: [PATCH] Add some unit tests

---
 .github/workflows/CI.yml         | 27 ++++++++++++++++++++++++++
 pyproject.toml                   |  4 ++++
 tests/data/invalid.css           |  5 +++++
 tests/data/main.css              |  5 +++++
 tests/data/normalize.css         |  3 +++
 tests/test_bundle_css.py         | 30 +++++++++++++++++++++++++++++
 tests/test_process_stylesheet.py | 33 ++++++++++++++++++++++++++++++++
 7 files changed, 107 insertions(+)
 create mode 100644 tests/data/invalid.css
 create mode 100644 tests/data/main.css
 create mode 100644 tests/data/normalize.css
 create mode 100644 tests/test_bundle_css.py
 create mode 100644 tests/test_process_stylesheet.py

diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 3085f29..6ebf35f 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -87,6 +87,33 @@ jobs:
           name: wheels-${{ runner.os }}-${{ matrix.target }}
           path: dist/*
 
+  test:
+    name: Test wheels on ${{ matrix.os }} (${{ matrix.python-version }})
+    needs: linux
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ['3.10']
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Download x86_64 wheels
+        uses: actions/download-artifact@v4
+        with:
+          name: wheels-Linux-x86_64
+          path: dist
+      - name: Install wheel and dependencies
+        run: |
+          pip install --upgrade pip
+          pip install --no-index --find-links=dist lightningcss
+          pip install --group dev
+      - name: Run tests
+        run: pytest
+
   sdist:
     runs-on: ubuntu-latest
     steps:
diff --git a/pyproject.toml b/pyproject.toml
index 59e9530..ad0a8a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,10 @@ classifiers = [
 [project.urls]
 Source = "https://github.com/pydsigner/python-lightningcss"
 
+[dependency-groups]
+dev = [
+    "pytest>=9.0.2",
+]
 
 [tool.maturin]
 features = ["pyo3/extension-module"]
diff --git a/tests/data/invalid.css b/tests/data/invalid.css
new file mode 100644
index 0000000..e2cf0d4
--- /dev/null
+++ b/tests/data/invalid.css
@@ -0,0 +1,5 @@
+* {
+  box-sizing: border-box;
+}
+
+something invalid
diff --git a/tests/data/main.css b/tests/data/main.css
new file mode 100644
index 0000000..fe59f08
--- /dev/null
+++ b/tests/data/main.css
@@ -0,0 +1,5 @@
+@import "normalize.css" layer(normalize);
+
+a {
+  color: blue;
+}
diff --git a/tests/data/normalize.css b/tests/data/normalize.css
new file mode 100644
index 0000000..1236d8e
--- /dev/null
+++ b/tests/data/normalize.css
@@ -0,0 +1,3 @@
+* {
+  box-sizing: border-box;
+}
diff --git a/tests/test_bundle_css.py b/tests/test_bundle_css.py
new file mode 100644
index 0000000..da1be14
--- /dev/null
+++ b/tests/test_bundle_css.py
@@ -0,0 +1,30 @@
+from pathlib import Path
+import pytest
+import lightningcss as lcss
+
+TEST_DATA_DIR = Path(__file__).parent / "data"
+MAIN_CSS_PATH = TEST_DATA_DIR / "main.css"
+NORMALIZE_CSS_PATH = TEST_DATA_DIR / "normalize.css"
+MISSING_CSS_PATH = TEST_DATA_DIR / "not-there.css"
+INVALID_CSS_PATH = TEST_DATA_DIR / "invalid.css"
+
+
+def test_minify():
+    expected = "@layer normalize{*{box-sizing:border-box}}a{color:#00f}"
+
+    result = lcss.bundle_css(str(MAIN_CSS_PATH))
+    assert result == expected
+
+def test_pretty_print():
+    expected = "* {\n  box-sizing: border-box;\n}\n"
+
+    result = lcss.bundle_css(str(NORMALIZE_CSS_PATH), minify=False)
+    assert result == expected
+
+def test_file_not_found():
+    with pytest.raises(OSError):
+        lcss.bundle_css(str(MISSING_CSS_PATH))
+
+def test_parse_error():
+    with pytest.raises(ValueError):
+        lcss.bundle_css(str(INVALID_CSS_PATH))
diff --git a/tests/test_process_stylesheet.py b/tests/test_process_stylesheet.py
new file mode 100644
index 0000000..31040cb
--- /dev/null
+++ b/tests/test_process_stylesheet.py
@@ -0,0 +1,33 @@
+import lightningcss as lcss
+import pytest
+
+
+def test_minify():
+    code = ".content { margin-inline: 3vw; padding: 1rem 2rem 1rem 2rem; }"
+    expected = ".content{margin-inline:3vw;padding:1rem 2rem}"
+
+    result = lcss.process_stylesheet(code)
+    assert result == expected
+
+def test_pretty_print():
+    code = ".content { margin: 3vw; }"
+    expected = ".content {\n  margin: 3vw;\n}\n"
+
+    result = lcss.process_stylesheet(code, minify=False)
+    assert result == expected
+
+def test_parse_error():
+    code = "img { display: block; } nonsense }{ non-terminated"
+
+    with pytest.raises(ValueError):
+        lcss.process_stylesheet(code)
+
+def test_error_recovery():
+    code = "img { display: block; } nonsense }{ non-terminated"
+    expected = "img{display:block}"
+
+    with pytest.raises(ValueError):
+        lcss.process_stylesheet(code, error_recovery=False)
+
+    result = lcss.process_stylesheet(code, error_recovery=True)
+    assert result == expected