test: create unit test cases for the bytes library

Author: rafamizes

lib/src/rand.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:math';
 
 import 'text.dart';
@@ -6,7 +7,7 @@ import 'text.dart';
 class Rand extends Text {
   /// Random text having [src] as the source of eligible characters, [len] as
   /// the length, and [index] as the index randomizer.
-  Rand(int len, Future<String> src, [Random? index])
+  Rand(int len, FutureOr<String> src, [Random? index])
       : super(
           Future(() async {
             final buffer = StringBuffer();
@@ -20,12 +21,8 @@ class Rand extends Text {
         );
 
   /// Random digits [0–9] of length [len].
-  Rand.dig(int len, [Random? index]) : this.str(len, '0123456789', index);
+  Rand.dig(int len, [Random? index]) : this(len, '0123456789', index);
 
   /// Random hex digits [0–9a-f] of length [len].
-  Rand.hex(int len, [Random? index]) : this.str(len, '0123456789abcdef', index);
-
-  /// Random string of length [len] from [src].
-  Rand.str(int len, String src, [Random? index])
-      : this(len, Future.value(src), index);
+  Rand.hex(int len, [Random? index]) : this(len, '0123456789abcdef', index);
 }

test/bytes_test.dart

@@ -0,0 +1,36 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:dartoos/src/bytes.dart';
+import 'package:test/test.dart';
+
+Future<void> main() async {
+  group('library bytes', () {
+    group('BytesOf', () {
+      const bytes = <int>[0x00, 0x01, 0x3d];
+      test('from bytes', () async {
+        expect(await BytesOf(Uint8List.fromList(bytes)), bytes);
+      });
+      test('from list', () async {
+        expect(await BytesOf.list(bytes), bytes);
+      });
+      test('from utf8', () async {
+        final String str = utf8.decode(bytes);
+        expect(await BytesOf.utf8(str), bytes);
+        expect(await BytesOf.utf8('abc'), utf8.encode('abc'));
+      });
+      test('from file', () async {
+        final tempDir = Directory.systemTemp.createTempSync();
+        final tempFile = File("${tempDir.path}/$pid.test");
+        try {
+          tempFile.createSync();
+          tempFile.writeAsBytesSync(bytes);
+          expect(await BytesOf.file(tempFile), bytes);
+        } finally {
+          tempDir.deleteSync(recursive: true);
+        }
+      });
+    });
+  });
+}

test/rand_test.dart

@@ -37,11 +37,11 @@ Future<void> main() async {
   });
   group('Rand.str', () {
     test('length', () async {
-      final one = await Rand.str(1, 'abc');
+      final one = await Rand(1, 'abc');
       expect(one.length, 1);
     });
     test('custom characters source', () async {
-      final custom = await Rand.str(100, 'a', SeqIndexRandom());
+      final custom = await Rand(100, 'a', SeqIndexRandom());
       expect(custom.length, 100);
 
       /// Must not contain any character other than 'a'