Add more schema tests

Author: Kehrlann

mcp-test/src/test/java/io/modelcontextprotocol/spec/McpSchemaTests.java

@@ -1743,6 +1743,16 @@ void testEnumSchemaOptionDeserialization() throws Exception {
 		assertThat(option.title()).isEqualTo("Low Priority");
 	}
 
+	@Test
+	void testEnumSchemaOptionDeserializationWithUnknownField() throws Exception {
+		var option = JSON_MAPPER.readValue("""
+				{
+					"futureField": 42
+				}""", McpSchema.EnumSchemaOption.class);
+
+		assertThat(option).isNotNull();
+	}
+
 	@Test
 	void testEnumSchemaOptionDeserializationWithBothFieldsMissing() throws Exception {
 		var option = JSON_MAPPER.readValue("{}", McpSchema.EnumSchemaOption.class);
@@ -1751,6 +1761,16 @@ void testEnumSchemaOptionDeserializationWithBothFieldsMissing() throws Exception
 		assertThat(option.title()).isEqualTo("");
 	}
 
+	@Test
+	void testEnumSchemaOptionsRequiredField() {
+		assertThatThrownBy(() -> new McpSchema.EnumSchemaOption("~~~", null))
+			.isInstanceOf(IllegalArgumentException.class)
+			.hasMessage("title must not be null");
+		assertThatThrownBy(() -> new McpSchema.EnumSchemaOption(null, "~~~"))
+			.isInstanceOf(IllegalArgumentException.class)
+			.hasMessage("constValue must not be null");
+	}
+
 	@Test
 	void testUntitledSingleSelectEnumSchemaSerialization() throws Exception {
 		var schema = new McpSchema.UntitledSingleSelectEnumSchema(null, "Choose a color",