chore(ui/peer) : add unit test

test/peers_test.dart

@@ -0,0 +1,90 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:myceliumflut/main.dart'; // Adjust the import based on your project structure
+
+void main() {
+  group('preprocessPeers', () {
+    test('removes empty elements', () {
+      final peers = [
+        'tcp://192.168.0.1:9651',
+        '',
+        'tcp://192.168.0.2:9651',
+        ''
+      ];
+      final result = preprocessPeers(peers);
+      expect(result, ['tcp://192.168.0.1:9651', 'tcp://192.168.0.2:9651']);
+    });
+
+    test('removes duplicated elements', () {
+      final peers = [
+        'tcp://192.168.0.1:9651',
+        'tcp://192.168.0.2:9651',
+        'tcp://192.168.0.1:9651'
+      ];
+      final result = preprocessPeers(peers);
+      expect(result, ['tcp://192.168.0.1:9651', 'tcp://192.168.0.2:9651']);
+    });
+
+    test('removes empty and duplicated elements', () {
+      final peers = [
+        'tcp://192.168.0.1:9651',
+        '',
+        'tcp://192.168.0.2:9651',
+        'tcp://192.168.0.1:9651',
+        ''
+      ];
+      final result = preprocessPeers(peers);
+      expect(result, ['tcp://192.168.0.1:9651', 'tcp://192.168.0.2:9651']);
+    });
+
+    test('returns empty list if all elements are empty', () {
+      final peers = ['', '', ''];
+      final result = preprocessPeers(peers);
+      expect(result, []);
+    });
+
+    test('returns the same list if no empty or duplicated elements', () {
+      final peers = [
+        'tcp://192.168.0.1:9651',
+        'tcp://192.168.0.2:9651',
+        'peer3:9651'
+      ];
+      final result = preprocessPeers(peers);
+      expect(result,
+          ['tcp://192.168.0.1:9651', 'tcp://192.168.0.2:9651', 'peer3:9651']);
+    });
+  });
+
+  group('isValidPeers', () {
+    test('returns error if peers list is empty', () {
+      final peers = <String>[];
+      final result = isValidPeers(peers);
+      expect(result, "peers can't be empty");
+    });
+
+    test('returns error if peers list contains only an empty string', () {
+      final peers = [''];
+      final result = isValidPeers(peers);
+      expect(result, "peers can't be empty");
+    });
+
+    test('returns error for invalid peer without tcp prefix', () {
+      final peers = ['tcp://192.168.0.1:9651', '192.168.0.3:9651'];
+      final result = isValidPeers(peers);
+      expect(result,
+          'invalid peer:`192.168.0.3:9651` peer must start with tcp://');
+    });
+
+    test('returns error for invalid peer without port', () {
+      final peers = ['tcp://192.168.0.1:9651', 'tcp://192.168.0.3'];
+      final result = isValidPeers(peers);
+      expect(
+          result, 'invalid peer:`tcp://192.168.0.3` peer must end with :9651');
+    });
+
+    test('returns null for valid peers', () {
+      final peers = ['tcp://192.168.0.1:9651', 'tcp://192.168.0.2:9651'];
+      final result = isValidPeers(peers);
+      expect(result, null);
+    });
+  });
+}