add test

pdtable/test/io/parsers/test_blocks.py

@@ -0,0 +1,15 @@
+from pdtable.io.parsers.blocks import _safe_strip
+
+
+class TestSafeStrip:
+    def test_string_input(self) -> None:
+        assert _safe_strip("  hello  ") == "hello"
+
+    def test_int_input(self) -> None:
+        assert _safe_strip(123) == "123"
+
+    def test_string_input_with_leading_trailing_spaces(self) -> None:
+        assert _safe_strip("  hello world  ") == "hello world"
+
+    def test_int_input_with_leading_trailing_spaces(self) -> None:
+        assert _safe_strip("  123  ") == "123"