feat(post_creation): added multiple image posts creation and validation

test/features/blog_post_create/validation/blog_post_form_validator_test.dart

@@ -0,0 +1,191 @@
+import 'package:eatvio_app/features/blog_post_create/validation/blog_post_form_validator.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('BlogPostFormValidator.title', () {
+    test('allows empty', () {
+      expect(BlogPostFormValidator.title(''), isNull);
+      expect(BlogPostFormValidator.title('   '), isNull);
+      expect(BlogPostFormValidator.title(null), isNull);
+    });
+
+    test('rejects shorter than 3 chars', () {
+      expect(
+        BlogPostFormValidator.title('ab'),
+        BlogPostFormValidator.titleTooShort,
+      );
+      expect(
+        BlogPostFormValidator.title('  a  '),
+        BlogPostFormValidator.titleTooShort,
+      );
+    });
+
+    test('allows 3+ chars', () {
+      expect(BlogPostFormValidator.title('abc'), isNull);
+      expect(BlogPostFormValidator.title('  hello  '), isNull);
+    });
+  });
+
+  group('BlogPostFormValidator.description', () {
+    test('allows empty and rejects short', () {
+      expect(BlogPostFormValidator.description(''), isNull);
+      expect(
+        BlogPostFormValidator.description('xy'),
+        BlogPostFormValidator.descriptionTooShort,
+      );
+      expect(BlogPostFormValidator.description('xyz'), isNull);
+    });
+  });
+
+  group('BlogPostFormValidator.videoUrl', () {
+    test('allows empty', () {
+      expect(BlogPostFormValidator.videoUrl(''), isNull);
+      expect(BlogPostFormValidator.videoUrl('  '), isNull);
+    });
+
+    test('rejects unsupported hosts', () {
+      expect(
+        BlogPostFormValidator.videoUrl('https://youtube.com/watch?v=abc'),
+        BlogPostFormValidator.videoUrlUnsupportedHost,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://rutube.ru.evil.com/video/abc'),
+        BlogPostFormValidator.videoUrlUnsupportedHost,
+      );
+    });
+
+    test('accepts rutube / vk / ok formats', () {
+      expect(
+        BlogPostFormValidator.videoUrl('https://rutube.ru/video/abc123/'),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://www.rutube.ru/shorts/abc123'),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://vk.com/video-123_456'),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://vkvideo.ru/video123_456/'),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://ok.ru/video/12345'),
+        isNull,
+      );
+    });
+
+    test('rejects invalid path formats for allowed hosts', () {
+      expect(
+        BlogPostFormValidator.videoUrl('https://rutube.ru/channel/abc'),
+        BlogPostFormValidator.videoUrlRutubeFormat,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://vk.com/feed'),
+        BlogPostFormValidator.videoUrlVkFormat,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('https://ok.ru/profile/1'),
+        BlogPostFormValidator.videoUrlOkFormat,
+      );
+    });
+
+    test('rejects malformed urls', () {
+      expect(
+        BlogPostFormValidator.videoUrl('not-a-url'),
+        BlogPostFormValidator.videoUrlInvalid,
+      );
+      expect(
+        BlogPostFormValidator.videoUrl('ftp://rutube.ru/video/abc'),
+        BlogPostFormValidator.videoUrlInvalid,
+      );
+    });
+  });
+
+  group('BlogPostFormValidator.contentRequiredMessage', () {
+    test('requires at least one filled field', () {
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: '',
+          description: '',
+          videoUrl: '',
+          imageCount: 0,
+        ),
+        BlogPostFormValidator.contentRequired,
+      );
+    });
+
+    test('accepts any valid content source', () {
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: 'abc',
+          description: '',
+          videoUrl: '',
+          imageCount: 0,
+        ),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: '',
+          description: 'abc',
+          videoUrl: '',
+          imageCount: 0,
+        ),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: '',
+          description: '',
+          videoUrl: '',
+          imageCount: 1,
+        ),
+        isNull,
+      );
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: '',
+          description: '',
+          videoUrl: 'https://rutube.ru/video/abc123/',
+          imageCount: 0,
+        ),
+        isNull,
+      );
+    });
+
+    test('does not count short title or invalid video as content', () {
+      expect(
+        BlogPostFormValidator.contentRequiredMessage(
+          title: 'ab',
+          description: '',
+          videoUrl: 'https://youtube.com/watch?v=1',
+          imageCount: 0,
+        ),
+        BlogPostFormValidator.contentRequired,
+      );
+    });
+  });
+
+  group('BlogPostFormValidator.imagePaths', () {
+    test('allows jpg/jpeg/png', () {
+      expect(
+        BlogPostFormValidator.imagePaths(['a.jpg', 'b.JPEG', 'c.png']),
+        isNull,
+      );
+    });
+
+    test('rejects other extensions', () {
+      expect(
+        BlogPostFormValidator.imagePaths(['a.webp']),
+        BlogPostFormValidator.imageTypeInvalid,
+      );
+      expect(
+        BlogPostFormValidator.imagePaths(['noext']),
+        BlogPostFormValidator.imageTypeInvalid,
+      );
+    });
+  });
+}