font

tests/unit/utils/test_system_fonts.py

@@ -0,0 +1,77 @@
+"""Tests for system font utilities."""
+
+from types import ModuleType
+import importlib.util
+import pathlib
+import sys
+
+import pytest
+
+
+@pytest.fixture
+def system_module():
+    """Load the system utilities module without importing the addon __init__."""
+    module_name = "src.utils.system"
+    original = sys.modules.pop(module_name, None)
+
+    spec = importlib.util.spec_from_file_location(
+        module_name,
+        pathlib.Path(__file__).resolve().parents[3] / "src" / "utils" / "system.py",
+    )
+    module = importlib.util.module_from_spec(spec)
+    assert spec.loader is not None
+    sys.modules[module_name] = module
+    spec.loader.exec_module(module)
+    try:
+        yield module
+    finally:
+        if original is None:
+            sys.modules.pop(module_name, None)
+        else:
+            sys.modules[module_name] = original
+
+
+def test_find_default_truetype_font_skips_fonts_without_latin(monkeypatch, system_module):
+    """Ensure selection skips fonts that produce unusable glyph metrics."""
+    try:
+        from PIL import ImageFont
+    except ImportError:
+        pytest.skip("Pillow not available in test environment")
+
+    def fake_system():
+        return "Darwin"
+
+    monkeypatch.setattr(system_module.platform, "system", fake_system)
+
+    def fake_exists(path):
+        return path in {"/bad/font.ttf", "/good/font.ttf"}
+
+    monkeypatch.setattr(system_module.os.path, "exists", fake_exists)
+
+    monkeypatch.setattr(
+        system_module,
+        "get_system_fonts",
+        lambda: {"Bad": "/bad/font.ttf", "Good": "/good/font.ttf"},
+    )
+
+    class FontStub:
+        def __init__(self, path):
+            self.path = path
+
+        def getbbox(self, text):
+            if self.path == "/bad/font.ttf":
+                if text == "H":
+                    return (0, 10, 40, 50)
+                return (0, 0, 100, 200)
+            if text == "H":
+                return (0, 12, 36, 52)
+            return (0, 20, 30, 48)
+
+    def fake_truetype(path, size):
+        return FontStub(path)
+
+    monkeypatch.setattr(ImageFont, "truetype", fake_truetype)
+    system_module._DEFAULT_FONT_CACHE = None
+
+    selected = system_module.find_default_truetype_font()
+    assert selected == "/good/font.ttf"