add PhoneType test

@@ -19,6 +19,8 @@ enum PhoneType {
 
   factory PhoneType.fromRawValue(int value) {
     switch (value) {
+      case 0:
+        return PhoneType.unknown;
       case 1:
         return PhoneType.work;
       case 2:
@@ -27,9 +29,8 @@ enum PhoneType {
         return PhoneType.fax;
       case 4:
         return PhoneType.mobile;
-      case 0:
       default:
-        return PhoneType.unknown;
+        throw ArgumentError.value(value, 'value', 'Invalid raw value.');
     }
   }
 

+import 'package:flutter_test/flutter_test.dart';
+import 'package:mobile_scanner/src/enums/phone_type.dart';
+
+void main() {
+  group('$PhoneType tests', () {
+    test('can be created from raw value', () {
+      const values = <int, PhoneType>{
+        0: PhoneType.unknown,
+        1: PhoneType.work,
+        2: PhoneType.home,
+        3: PhoneType.fax,
+        4: PhoneType.mobile,
+      };
+
+      for (final MapEntry<int, PhoneType> entry in values.entries) {
+        final PhoneType result = PhoneType.fromRawValue(entry.key);
+
+        expect(result, entry.value);
+      }
+    });
+
+    test('invalid raw value throws argument error', () {
+      const int negative = -1;
+      const int outOfRange = 5;
+
+      expect(() => PhoneType.fromRawValue(negative), throwsArgumentError);
+      expect(() => PhoneType.fromRawValue(outOfRange), throwsArgumentError);
+    });
+
+    test('can be converted to raw value', () {
+      const values = <PhoneType, int>{
+        PhoneType.unknown: 0,
+        PhoneType.work: 1,
+        PhoneType.home: 2,
+        PhoneType.fax: 3,
+        PhoneType.mobile: 4,
+      };
+
+      for (final MapEntry<PhoneType, int> entry in values.entries) {
+        final int result = entry.key.rawValue;
+
+        expect(result, entry.value);
+      }
+    });
+  });
+}