Add remaining test files

tests/test_validators/test_best_practices.py

@@ -0,0 +1,14 @@
+import pytest
+from src.validators import BestPracticesValidator
+
+class TestBestPracticesValidator:
+    def setup_method(self):
+        self.validator = BestPracticesValidator()
+
+    def test_missing_shebang(self):
+        findings = self.validator.check("echo hello")
+        assert len(findings) >= 1
+
+    def test_has_shebang(self):
+        findings = self.validator.check("#!/bin/bash\necho hello")
+        assert len(findings) == 0