Initial Commit

packages/foundation/flow/streams/src/utils/buffer/uint8-slice/uint8-slice.test.ts

@@ -0,0 +1,36 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import { createUint8ArraySlice } from "./uint8-slice.js";
+
+describe("createUint8ArraySlice", () => {
+    it("returns a slice of the given range", { timeout: 5000 }, () => {
+        const src = new Uint8Array([10, 20, 30, 40, 50]);
+        const out = createUint8ArraySlice(src, 1, 4);
+        expect(Array.from(out)).toEqual([20, 30, 40]);
+    });
+
+    it("produces an independent copy (no shared memory)", {
+        timeout: 5000,
+    }, () => {
+        const src = new Uint8Array([1, 2, 3, 4]);
+        const out = createUint8ArraySlice(src, 0, 4);
+        out[0] = 99;
+        expect(src[0]).toBe(1);
+    });
+
+    it("returns empty when start === end", { timeout: 5000 }, () => {
+        const src = new Uint8Array([1, 2, 3]);
+        expect(createUint8ArraySlice(src, 1, 1).byteLength).toBe(0);
+    });
+
+    it("clamps end past length", { timeout: 5000 }, () => {
+        const src = new Uint8Array([1, 2, 3]);
+        expect(Array.from(createUint8ArraySlice(src, 0, 99))).toEqual([
+            1, 2, 3,
+        ]);
+    });
+
+    it("supports zero-length input", { timeout: 5000 }, () => {
+        const src = new Uint8Array(0);
+        expect(createUint8ArraySlice(src, 0, 0).byteLength).toBe(0);
+    });
+});