Add remaining test files

tests/test_validators/test_security.py

@@ -0,0 +1,14 @@
+import pytest
+from src.validators import SecurityValidator
+
+class TestSecurityValidator:
+    def setup_method(self):
+        self.validator = SecurityValidator()
+
+    def test_detect_unquoted_variable(self):
+        findings = self.validator.check("cp $SRC_DIR $DEST_DIR")
+        assert len(findings) >= 1
+
+    def test_safe_quoted_variables(self):
+        findings = self.validator.check('cp "$SRC_DIR" "$DEST_DIR"')
+        assert len(findings) == 0