Initial upload: ErrorFix CLI with rule engine and pattern matching

tests/unit/test_rules.py

@@ -0,0 +1,68 @@
+import pytest
+from errorfix.rules import Rule
+
+
+class TestRule:
+    def test_rule_creation(self):
+        rule = Rule(
+            id='test-rule',
+            name='Test Rule',
+            pattern='TestError: .*',
+            fix='Fix it',
+            description='A test rule',
+        )
+        assert rule.id == 'test-rule'
+        assert rule.name == 'Test Rule'
+        assert rule.pattern == 'TestError: .*'
+        assert rule.fix == 'Fix it'
+        assert rule.description == 'A test rule'
+        assert rule.severity.value == 'error'
+
+    def test_rule_from_dict(self):
+        data = {
+            'id': 'test-rule',
+            'name': 'Test Rule',
+            'pattern': 'TestError: .*',
+            'fix': 'Fix it',
+            'description': 'A test rule',
+            'severity': 'warning',
+            'language': 'python',
+            'tags': ['test', 'example'],
+            'priority': 10,
+        }
+        rule = Rule.from_dict(data)
+        assert rule.id == 'test-rule'
+        assert rule.severity.value == 'warning'
+        assert rule.language == 'python'
+        assert rule.tags == ['test', 'example']
+        assert rule.priority == 10
+
+    def test_rule_to_dict(self):
+        rule = Rule(
+            id='test-rule',
+            name='Test Rule',
+            pattern='TestError: .*',
+            fix='Fix it',
+            description='A test rule',
+            severity='warning',
+        )
+        data = rule.to_dict()
+        assert data['id'] == 'test-rule'
+        assert data['severity'] == 'warning'
+
+    def test_rule_with_all_fields(self):
+        rule = Rule(
+            id='full-rule',
+            name=' 'Full Rule',
+            pattern='FullError: (?P<msg>.*)',
+            fix='Fix {msg}',
+            description='A rule with all fields',
+            severity='suggestion',
+            language='javascript',
+            tool='node',
+            tags=['tag1', 'tag2'],
+            priority=7,
+            metadata={'extra': 'data'},
+        )
+        assert rule.tool == 'node'
+        assert rule.metadata == {'extra': 'data'}