Changed splitBufferBundle to use Object.entries and added tests for it

spec/utils.ts

@@ -0,0 +1,59 @@
+import { splitBufferBundle } from "../lib/utils";
+import type { BundleUnit } from "../src/schema";
+
+describe("splitBufferBundle", () => {
+	it("should split the bundle in language-organized files buffers and normal files with valid bundleUnit passed", () => {
+		const zeroBuffer = Buffer.alloc(0);
+		const payload: BundleUnit = {
+			"en.lproj/thumbnail@2x.png": zeroBuffer,
+			"de.lproj/background@2x.png": zeroBuffer,
+			"it.lproj/thumbnail@2x.png": zeroBuffer,
+			"thumbnail@2x.png": zeroBuffer,
+			"background.png": zeroBuffer
+		};
+
+		const result = splitBufferBundle(payload);
+
+		expect(result).toBeDefined();
+		expect(result.length).toBe(2);
+		expect(result[0]).toEqual({
+			"en.lproj": {
+				"thumbnail@2x.png": zeroBuffer,
+			},
+			"de.lproj": {
+				"background@2x.png": zeroBuffer,
+			},
+			"it.lproj": {
+				"thumbnail@2x.png": zeroBuffer,
+			}
+		});
+		expect(result[1]).toEqual({
+			"thumbnail@2x.png": zeroBuffer,
+			"background.png": zeroBuffer
+		});
+	});
+
+	it("should return empty partitionedBufferBundle if BundleUnit is empty object", () => {
+		const result = splitBufferBundle({});
+
+		expect(result).toBeDefined();
+		expect(result.length).toBe(2);
+		expect(result[0]).toEqual({});
+		expect(result[1]).toEqual({});
+	});
+
+	it("should return empty partitionedBufferBundle if BundleUnit is undefined", () => {
+		const resultUndefined = splitBufferBundle(undefined);
+		const resultNull = splitBufferBundle(null);
+
+		expect(resultUndefined).toBeDefined();
+		expect(resultUndefined.length).toBe(2);
+		expect(resultUndefined[0]).toEqual({});
+		expect(resultUndefined[1]).toEqual({});
+
+		expect(resultNull).toBeDefined();
+		expect(resultNull.length).toBe(2);
+		expect(resultNull[0]).toEqual({});
+		expect(resultNull[1]).toEqual({});
+	});
+});