Add tests for sublistView

Author: mgenware

test/bytes_view_test.dart

@@ -0,0 +1,64 @@
+import 'dart:typed_data';
+
+import 'package:random_access_source/random_access_source.dart';
+import 'package:test/test.dart';
+
+Future<BytesRASource> _bytesSource() async {
+  return BytesRASource(Uint8List.sublistView(
+      Uint8List.fromList([-1, 0, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 3, 8));
+}
+
+void main() {
+  test('Length', () async {
+    final src = await _bytesSource();
+    expect(await src.length(), 5);
+    await src.close();
+  });
+
+  test('ReadByte', () async {
+    final src = await _bytesSource();
+    expect(await src.readByte(), 1);
+    expect(await src.position(), 1);
+
+    expect(await src.readByte(), 2);
+    expect(await src.position(), 2);
+
+    expect(await src.readByte(), 3);
+    expect(await src.position(), 3);
+
+    expect(await src.readByte(), 4);
+    expect(await src.position(), 4);
+
+    expect(await src.readByte(), 5);
+    expect(await src.position(), 5);
+
+    expect(await src.readByte(), -1);
+    expect(await src.position(), 5);
+    await src.close();
+  });
+
+  test('Read', () async {
+    final src = await _bytesSource();
+    expect(await src.read(2), Uint8List.fromList([1, 2]));
+    expect(await src.position(), 2);
+
+    expect(await src.read(2), Uint8List.fromList([3, 4]));
+    expect(await src.position(), 4);
+
+    expect(await src.read(2), Uint8List.fromList([5]));
+    expect(await src.position(), 5);
+
+    expect(await src.read(2), Uint8List(0));
+    expect(await src.position(), 5);
+    await src.close();
+  });
+
+  test('Position', () async {
+    final src = await _bytesSource();
+    expect(await src.position(), 0);
+    await src.setPosition(2);
+    expect(await src.position(), 2);
+    expect(await src.readByte(), 3);
+    await src.close();
+  });
+}