Add unit tests for fixUint8Array

Author: webmaster128

packages/encoding/src/uint8array.spec.ts

@@ -0,0 +1,19 @@
+import { fixUint8Array } from "./uint8array";
+
+describe("fixUint8Array", () => {
+  it("works for Uint8Array<ArrayBuffer>", () => {
+    const input: Uint8Array<ArrayBuffer> = Uint8Array.of(1, 2, 255);
+    const fixed = fixUint8Array(input);
+    expect(fixed).toEqual(input);
+    expect(fixed.buffer).toBeInstanceOf(ArrayBuffer);
+    expect(fixed.buffer).toBe(input.buffer); // no copy must be performed in this case
+  });
+
+  it("works for Uint8Array<SharedArrayBuffer>", () => {
+    const sharedBuffer = new SharedArrayBuffer(8);
+    const input: Uint8Array<SharedArrayBuffer> = new Uint8Array(sharedBuffer);
+    const fixed = fixUint8Array(input);
+    expect(fixed).toEqual(input);
+    expect(fixed.buffer).toBeInstanceOf(ArrayBuffer);
+  });
+});