diff --git a/tests/test_rules.py b/tests/test_rules.py
new file mode 100644
index 0000000..4dc64af
--- /dev/null
+++ b/tests/test_rules.py
@@ -0,0 +1,278 @@
+"""Tests for rule analyzers."""
+
+import pytest
+from pathlib import Path
+import tempfile
+import os
+
+from src.analyzers.base import SeverityLevel, FindingCategory
+from src.rules.security import SQLInjectionAnalyzer, EvalUsageAnalyzer, PathTraversalAnalyzer
+from src.rules.antipatterns import (
+    ExceptionSwallowAnalyzer,
+    MagicNumberAnalyzer,
+    DeepNestingAnalyzer,
+    LongFunctionAnalyzer,
+)
+from src.rules.secrets import HardcodedSecretAnalyzer
+from src.rules.performance import InefficientLoopAnalyzer, RedundantOperationAnalyzer, UnnecessaryCopyAnalyzer
+
+
+class TestSQLInjectionAnalyzer:
+    """Tests for SQL injection detection."""
+
+    def setup_method(self):
+        self.analyzer = SQLInjectionAnalyzer()
+
+    def test_no_false_positive_with_safe_query(self):
+        code = '''
+user_input = "test"
+result = safe_query(user_input)
+'''
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) == 0
+
+    def test_no_false_positive_with_parameterized_query(self):
+        code = """
+cursor.execute("SELECT * FROM users WHERE name = ?", (user_input,))
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) == 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestEvalUsageAnalyzer:
+    """Tests for eval/exec detection."""
+
+    def setup_method(self):
+        self.analyzer = EvalUsageAnalyzer()
+
+    def test_detects_eval_usage(self):
+        code = """
+user_input = "os.system('rm -rf /')"
+result = eval(user_input)
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+        assert findings[0].severity == SeverityLevel.CRITICAL
+
+    def test_detects_exec_usage(self):
+        code = """
+code = "print('hello')"
+exec(code)
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestExceptionSwallowAnalyzer:
+    """Tests for exception swallowing detection."""
+
+    def setup_method(self):
+        self.analyzer = ExceptionSwallowAnalyzer()
+
+    def test_detects_empty_except_clause(self):
+        code = """
+try:
+    dangerous_operation()
+except:
+    pass
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestMagicNumberAnalyzer:
+    """Tests for magic number detection."""
+
+    def setup_method(self):
+        self.analyzer = MagicNumberAnalyzer()
+
+    def test_detects_magic_number(self):
+        code = """
+result = 42 * multiplier
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+
+    def test_no_false_positive_for_small_numbers(self):
+        code = """
+for i in range(3):
+    process(i)
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) == 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestHardcodedSecretAnalyzer:
+    """Tests for hardcoded secret detection."""
+
+    def setup_method(self):
+        self.analyzer = HardcodedSecretAnalyzer()
+
+    def test_detects_aws_access_key(self):
+        code = """
+AWS_KEY = "AKIAIOSFODNN7EXAMPLE"
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+        assert findings[0].severity == SeverityLevel.CRITICAL
+
+    def test_detects_github_token(self):
+        code = """
+GITHUB_TOKEN = "ghp_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestPathTraversalAnalyzer:
+    """Tests for path traversal detection."""
+
+    def setup_method(self):
+        self.analyzer = PathTraversalAnalyzer()
+
+    def test_no_false_positive_with_safe_path(self):
+        code = '''
+user_input = "safe/path"
+result = safe_open(user_input)
+'''
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) == 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestInefficientLoopAnalyzer:
+    """Tests for inefficient loop detection."""
+
+    def setup_method(self):
+        self.analyzer = InefficientLoopAnalyzer()
+
+    def test_detects_inefficient_loop(self):
+        code = """
+items = [1, 2, 3, 4, 5]
+for i in range(len(items)):
+    print(items[i])
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) > 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestRedundantOperationAnalyzer:
+    """Tests for redundant operation detection."""
+
+    def setup_method(self):
+        self.analyzer = RedundantOperationAnalyzer()
+
+    def test_detects_redundant_list_call(self):
+        code = """
+items = [1, 2, 3]
+result = list(list(items))
+"""
+        tree = self._parse_code(code)
+        findings = self.analyzer.analyze(code, Path("test.py"), tree)
+        assert len(findings) >= 0
+
+    def _parse_code(self, code):
+        from src.analyzers import PythonParser
+        parser = PythonParser()
+        return parser.parse(code)
+
+
+class TestRuleMetadata:
+    """Tests for rule metadata."""
+
+    def test_all_rules_have_unique_ids(self):
+        analyzers = [
+            SQLInjectionAnalyzer(),
+            EvalUsageAnalyzer(),
+            PathTraversalAnalyzer(),
+            ExceptionSwallowAnalyzer(),
+            MagicNumberAnalyzer(),
+            DeepNestingAnalyzer(),
+            LongFunctionAnalyzer(),
+            HardcodedSecretAnalyzer(),
+            InefficientLoopAnalyzer(),
+            RedundantOperationAnalyzer(),
+            UnnecessaryCopyAnalyzer(),
+        ]
+        rule_ids = [a.rule_id() for a in analyzers]
+        assert len(rule_ids) == len(set(rule_ids)), "Rule IDs must be unique"
+
+    def test_all_rules_have_valid_severity(self):
+        analyzers = [
+            SQLInjectionAnalyzer(),
+            EvalUsageAnalyzer(),
+            PathTraversalAnalyzer(),
+            ExceptionSwallowAnalyzer(),
+            MagicNumberAnalyzer(),
+            DeepNestingAnalyzer(),
+            LongFunctionAnalyzer(),
+            HardcodedSecretAnalyzer(),
+            InefficientLoopAnalyzer(),
+            RedundantOperationAnalyzer(),
+            UnnecessaryCopyAnalyzer(),
+        ]
+        for analyzer in analyzers:
+            assert analyzer.severity() in list(SeverityLevel)
+
+    def test_all_rules_have_valid_category(self):
+        from src.analyzers.base import FindingCategory
+        analyzers = [
+            SQLInjectionAnalyzer(),
+            EvalUsageAnalyzer(),
+            PathTraversalAnalyzer(),
+            ExceptionSwallowAnalyzer(),
+            MagicNumberAnalyzer(),
+            DeepNestingAnalyzer(),
+            LongFunctionAnalyzer(),
+            HardcodedSecretAnalyzer(),
+            InefficientLoopAnalyzer(),
+            RedundantOperationAnalyzer(),
+            UnnecessaryCopyAnalyzer(),
+        ]
+        for analyzer in analyzers:
+            assert analyzer.category() in list(FindingCategory)