feat: add basic test code

Author: juntae6942

spring-web/src/test/java/org/springframework/web/util/HtmlCharacterEntityDecoderTest.java

@@ -23,4 +23,18 @@ void unescapeHandlesSupplementaryCharactersCorrectly() {
 		assertEquals(expectedCharacter, actualResultFromDecimal, "Decimal entity was not converted correctly.");
 		assertEquals(expectedCharacter, actualResultFromHex, "Hexadecimal entity was not converted correctly.");
 	}
-}
+
+	@Test
+	@DisplayName("Should correctly unescape basic and named HTML entities")
+	void unescapeHandlesBasicEntities() {
+		// Arrange
+		String input = "<p>Tom & Jerry's "Show"</p>";
+		String expectedOutput = "<p>Tom & Jerry's \"Show\"</p>";
+
+		// Act
+		String actualOutput = HtmlUtils.htmlUnescape(input);
+
+		// Assert
+		assertEquals(expectedOutput, actualOutput, "Basic HTML entities were not unescaped correctly.");
+	}
+}