fix: fallback for cjk fonts when italic font style not available

packages/fonts/src/index.test.ts

@@ -0,0 +1,25 @@
+import { describe, expect, it } from "vitest";
+import { fontList, getPdfCjkFallbackFontFamily, getWebFontSource } from "./index";
+
+const sortFontFamilies = (families: string[]) => {
+	return [...families].sort((a, b) => a.localeCompare(b, undefined, { sensitivity: "base" }));
+};
+
+describe("fontList", () => {
+	it("is ordered by font family name instead of localized display name", () => {
+		const families = fontList.map((font) => font.family);
+
+		expect(families).toEqual(sortFontFamilies(families));
+	});
+});
+
+describe("font source helpers", () => {
+	it("uses the full normal font source when an italic variant is unavailable", () => {
+		expect(getWebFontSource("Noto Serif SC", "400", true)).toBe(getWebFontSource("Noto Serif SC", "400", false));
+	});
+
+	it("returns CJK PDF fallbacks for standard PDF fonts", () => {
+		expect(getPdfCjkFallbackFontFamily("Helvetica")).toBe("Noto Sans SC");
+		expect(getPdfCjkFallbackFontFamily("Times-Roman")).toBe("Noto Serif SC");
+	});
+});