diff --git a/test/core.ts b/test/core.ts
index a4ad393..b6ff74e 100644
--- a/test/core.ts
+++ b/test/core.ts
@@ -1,28 +1,33 @@
 import assert from 'assert';
 import * as P from '../src/internal/core';
 
+const state = {
+	nestLimit: 3,
+	depth: 0,
+};
+
 describe('core', () => {
 	describe('difference', () => {
 		test('basic', () => {
 			const parser = P.difference(P.regexp(/\p{Letter}/u), P.str('x'));
 
-			let result = parser.handler('x',0,{}) as P.Success<any>;
+			let result = parser.handler('x',0,state) as P.Success<any>;
 			assert.deepStrictEqual(result,P.failure());
 
-			result = parser.handler('a',0,{}) as P.Success<any>;
+			result = parser.handler('a',0,state) as P.Success<any>;
 			assert.deepStrictEqual(result,P.success(1,'a'));
 		});
 
 		test('horizontal whitespace', () => {
 			const parser = P.difference(P.regexp(/\s/u), P.newline);
 
-			let result = parser.handler('\n',0,{}) as P.Success<any>;
+			let result = parser.handler('\n',0,state) as P.Success<any>;
 			assert.deepStrictEqual(result,P.failure());
 
-			result = parser.handler(' ',0,{}) as P.Success<any>;
+			result = parser.handler(' ',0,state) as P.Success<any>;
 			assert.deepStrictEqual(result,P.success(1,' '));
 
-			result = parser.handler('\t',0,{}) as P.Success<any>;
+			result = parser.handler('\t',0,state) as P.Success<any>;
 			assert.deepStrictEqual(result,P.success(1,'\t'));
 		});