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diff --git a/test/test-object-property-accessor.js b/test/test-object-property-accessor.js
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+++ b/test/test-object-property-accessor.js
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+/*
+ * Copyright (C) 2023  Yomitan Authors
+ * Copyright (C) 2020-2022  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+const assert = require('assert');
+const {testMain} = require('../dev/util');
+const {VM} = require('../dev/vm');
+
+const vm = new VM({});
+vm.execute('js/general/object-property-accessor.js');
+/** @type {typeof ObjectPropertyAccessor} */
+const ObjectPropertyAccessor2 = vm.getSingle('ObjectPropertyAccessor');
+
+
+/**
+ * @returns {import('core').UnknownObject}
+ */
+function createTestObject() {
+    return {
+        0: null,
+        value1: {
+            value2: {},
+            value3: [],
+            value4: null
+        },
+        value5: [
+            {},
+            [],
+            null
+        ]
+    };
+}
+
+
+/** */
+function testGet1() {
+    /** @type {[pathArray: (string|number)[], getExpected: (object: import('core').SafeAny) => unknown][]} */
+    const data = [
+        [[], (object) => object],
+        [['0'], (object) => object['0']],
+        [['value1'], (object) => object.value1],
+        [['value1', 'value2'], (object) => object.value1.value2],
+        [['value1', 'value3'], (object) => object.value1.value3],
+        [['value1', 'value4'], (object) => object.value1.value4],
+        [['value5'], (object) => object.value5],
+        [['value5', 0], (object) => object.value5[0]],
+        [['value5', 1], (object) => object.value5[1]],
+        [['value5', 2], (object) => object.value5[2]]
+    ];
+
+    for (const [pathArray, getExpected] of data) {
+        const object = createTestObject();
+        const accessor = new ObjectPropertyAccessor2(object);
+        const expected = getExpected(object);
+
+        assert.strictEqual(accessor.get(pathArray), expected);
+    }
+}
+
+/** */
+function testGet2() {
+    const object = createTestObject();
+    const accessor = new ObjectPropertyAccessor2(object);
+
+    /** @type {[pathArray: (string|number)[], message: string][]} */
+    const data = [
+        [[0], 'Invalid path: [0]'],
+        [['0', 'invalid'], 'Invalid path: ["0"].invalid'],
+        [['invalid'], 'Invalid path: invalid'],
+        [['value1', 'invalid'], 'Invalid path: value1.invalid'],
+        [['value1', 'value2', 'invalid'], 'Invalid path: value1.value2.invalid'],
+        [['value1', 'value2', 0], 'Invalid path: value1.value2[0]'],
+        [['value1', 'value3', 'invalid'], 'Invalid path: value1.value3.invalid'],
+        [['value1', 'value3', 0], 'Invalid path: value1.value3[0]'],
+        [['value1', 'value4', 'invalid'], 'Invalid path: value1.value4.invalid'],
+        [['value1', 'value4', 0], 'Invalid path: value1.value4[0]'],
+        [['value5', 'length'], 'Invalid path: value5.length'],
+        [['value5', 0, 'invalid'], 'Invalid path: value5[0].invalid'],
+        [['value5', 0, 0], 'Invalid path: value5[0][0]'],
+        [['value5', 1, 'invalid'], 'Invalid path: value5[1].invalid'],
+        [['value5', 1, 0], 'Invalid path: value5[1][0]'],
+        [['value5', 2, 'invalid'], 'Invalid path: value5[2].invalid'],
+        [['value5', 2, 0], 'Invalid path: value5[2][0]'],
+        [['value5', 2, 0, 'invalid'], 'Invalid path: value5[2][0]'],
+        [['value5', 2.5], 'Invalid index']
+    ];
+
+    for (const [pathArray, message] of data) {
+        assert.throws(() => accessor.get(pathArray), {message});
+    }
+}
+
+
+/** */
+function testSet1() {
+    const testValue = {};
+    /** @type {(string|number)[][]} */
+    const data = [
+        ['0'],
+        ['value1', 'value2'],
+        ['value1', 'value3'],
+        ['value1', 'value4'],
+        ['value1'],
+        ['value5', 0],
+        ['value5', 1],
+        ['value5', 2],
+        ['value5']
+    ];
+
+    for (const pathArray of data) {
+        const object = createTestObject();
+        const accessor = new ObjectPropertyAccessor2(object);
+
+        accessor.set(pathArray, testValue);
+        assert.strictEqual(accessor.get(pathArray), testValue);
+    }
+}
+
+/** */
+function testSet2() {
+    const object = createTestObject();
+    const accessor = new ObjectPropertyAccessor2(object);
+
+    const testValue = {};
+    /** @type {[pathArray: (string|number)[], message: string][]} */
+    const data = [
+        [[], 'Invalid path'],
+        [[0], 'Invalid path: [0]'],
+        [['0', 'invalid'], 'Invalid path: ["0"].invalid'],
+        [['value1', 'value2', 0], 'Invalid path: value1.value2[0]'],
+        [['value1', 'value3', 'invalid'], 'Invalid path: value1.value3.invalid'],
+        [['value1', 'value4', 'invalid'], 'Invalid path: value1.value4.invalid'],
+        [['value1', 'value4', 0], 'Invalid path: value1.value4[0]'],
+        [['value5', 1, 'invalid'], 'Invalid path: value5[1].invalid'],
+        [['value5', 2, 'invalid'], 'Invalid path: value5[2].invalid'],
+        [['value5', 2, 0], 'Invalid path: value5[2][0]'],
+        [['value5', 2, 0, 'invalid'], 'Invalid path: value5[2][0]'],
+        [['value5', 2.5], 'Invalid index']
+    ];
+
+    for (const [pathArray, message] of data) {
+        assert.throws(() => accessor.set(pathArray, testValue), {message});
+    }
+}
+
+
+/** */
+function testDelete1() {
+    /**
+     * @param {unknown} object
+     * @param {string} property
+     * @returns {boolean}
+     */
+    const hasOwn = (object, property) => Object.prototype.hasOwnProperty.call(object, property);
+
+    /** @type {[pathArray: (string|number)[], validate: (object: import('core').SafeAny) => boolean][]} */
+    const data = [
+        [['0'], (object) => !hasOwn(object, '0')],
+        [['value1', 'value2'], (object) => !hasOwn(object.value1, 'value2')],
+        [['value1', 'value3'], (object) => !hasOwn(object.value1, 'value3')],
+        [['value1', 'value4'], (object) => !hasOwn(object.value1, 'value4')],
+        [['value1'], (object) => !hasOwn(object, 'value1')],
+        [['value5'], (object) => !hasOwn(object, 'value5')]
+    ];
+
+    for (const [pathArray, validate] of data) {
+        const object = createTestObject();
+        const accessor = new ObjectPropertyAccessor2(object);
+
+        accessor.delete(pathArray);
+        assert.ok(validate(object));
+    }
+}
+
+/** */
+function testDelete2() {
+    /** @type {[pathArray: (string|number)[], message: string][]} */
+    const data = [
+        [[], 'Invalid path'],
+        [[0], 'Invalid path: [0]'],
+        [['0', 'invalid'], 'Invalid path: ["0"].invalid'],
+        [['value1', 'value2', 0], 'Invalid path: value1.value2[0]'],
+        [['value1', 'value3', 'invalid'], 'Invalid path: value1.value3.invalid'],
+        [['value1', 'value4', 'invalid'], 'Invalid path: value1.value4.invalid'],
+        [['value1', 'value4', 0], 'Invalid path: value1.value4[0]'],
+        [['value5', 1, 'invalid'], 'Invalid path: value5[1].invalid'],
+        [['value5', 2, 'invalid'], 'Invalid path: value5[2].invalid'],
+        [['value5', 2, 0], 'Invalid path: value5[2][0]'],
+        [['value5', 2, 0, 'invalid'], 'Invalid path: value5[2][0]'],
+        [['value5', 2.5], 'Invalid index'],
+        [['value5', 0], 'Invalid type'],
+        [['value5', 1], 'Invalid type'],
+        [['value5', 2], 'Invalid type']
+    ];
+
+    for (const [pathArray, message] of data) {
+        const object = createTestObject();
+        const accessor = new ObjectPropertyAccessor2(object);
+
+        assert.throws(() => accessor.delete(pathArray), {message});
+    }
+}
+
+
+/** */
+function testSwap1() {
+    /** @type {[pathArray: (string|number)[], compareValues: boolean][]} */
+    const data = [
+        [['0'], true],
+        [['value1', 'value2'], true],
+        [['value1', 'value3'], true],
+        [['value1', 'value4'], true],
+        [['value1'], false],
+        [['value5', 0], true],
+        [['value5', 1], true],
+        [['value5', 2], true],
+        [['value5'], false]
+    ];
+
+    for (const [pathArray1, compareValues1] of data) {
+        for (const [pathArray2, compareValues2] of data) {
+            const object = createTestObject();
+            const accessor = new ObjectPropertyAccessor2(object);
+
+            const value1a = accessor.get(pathArray1);
+            const value2a = accessor.get(pathArray2);
+
+            accessor.swap(pathArray1, pathArray2);
+
+            if (!compareValues1 || !compareValues2) { continue; }
+
+            const value1b = accessor.get(pathArray1);
+            const value2b = accessor.get(pathArray2);
+
+            assert.deepStrictEqual(value1a, value2b);
+            assert.deepStrictEqual(value2a, value1b);
+        }
+    }
+}
+
+/** */
+function testSwap2() {
+    /** @type {[pathArray1: (string|number)[], pathArray2: (string|number)[], checkRevert: boolean, message: string][]} */
+    const data = [
+        [[], [], false, 'Invalid path 1'],
+        [['0'], [], false, 'Invalid path 2'],
+        [[], ['0'], false, 'Invalid path 1'],
+        [[0], ['0'], false, 'Invalid path 1: [0]'],
+        [['0'], [0], false, 'Invalid path 2: [0]']
+    ];
+
+    for (const [pathArray1, pathArray2, checkRevert, message] of data) {
+        const object = createTestObject();
+        const accessor = new ObjectPropertyAccessor2(object);
+
+        let value1a;
+        let value2a;
+        if (checkRevert) {
+            try {
+                value1a = accessor.get(pathArray1);
+                value2a = accessor.get(pathArray2);
+            } catch (e) {
+                // NOP
+            }
+        }
+
+        assert.throws(() => accessor.swap(pathArray1, pathArray2), {message});
+
+        if (!checkRevert) { continue; }
+
+        const value1b = accessor.get(pathArray1);
+        const value2b = accessor.get(pathArray2);
+
+        assert.deepStrictEqual(value1a, value1b);
+        assert.deepStrictEqual(value2a, value2b);
+    }
+}
+
+
+/** */
+function testGetPathString1() {
+    /** @type {[pathArray: (string|number)[], expected: string][]} */
+    const data = [
+        [[], ''],
+        [[0], '[0]'],
+        [['escape\\'], '["escape\\\\"]'],
+        [['\'quote\''], '["\'quote\'"]'],
+        [['"quote"'], '["\\"quote\\""]'],
+        [['part1', 'part2'], 'part1.part2'],
+        [['part1', 'part2', 3], 'part1.part2[3]'],
+        [['part1', 'part2', '3'], 'part1.part2["3"]'],
+        [['part1', 'part2', '3part'], 'part1.part2["3part"]'],
+        [['part1', 'part2', '3part', 'part4'], 'part1.part2["3part"].part4'],
+        [['part1', 'part2', '3part', '4part'], 'part1.part2["3part"]["4part"]']
+    ];
+
+    for (const [pathArray, expected] of data) {
+        assert.strictEqual(ObjectPropertyAccessor2.getPathString(pathArray), expected);
+    }
+}
+
+/** */
+function testGetPathString2() {
+    /** @type {[pathArray: unknown[], message: string][]} */
+    const data = [
+        [[1.5], 'Invalid index'],
+        [[null], 'Invalid type: object']
+    ];
+
+    for (const [pathArray, message] of data) {
+        // @ts-ignore - Throwing is expected
+        assert.throws(() => ObjectPropertyAccessor2.getPathString(pathArray), {message});
+    }
+}
+
+
+/** */
+function testGetPathArray1() {
+    /** @type {[pathString: string, pathArray: (string|number)[]][]} */
+    const data = [
+        ['', []],
+        ['[0]', [0]],
+        ['["escape\\\\"]', ['escape\\']],
+        ['["\'quote\'"]', ['\'quote\'']],
+        ['["\\"quote\\""]', ['"quote"']],
+        ['part1.part2', ['part1', 'part2']],
+        ['part1.part2[3]', ['part1', 'part2', 3]],
+        ['part1.part2["3"]', ['part1', 'part2', '3']],
+        ['part1.part2[\'3\']', ['part1', 'part2', '3']],
+        ['part1.part2["3part"]', ['part1', 'part2', '3part']],
+        ['part1.part2[\'3part\']', ['part1', 'part2', '3part']],
+        ['part1.part2["3part"].part4', ['part1', 'part2', '3part', 'part4']],
+        ['part1.part2[\'3part\'].part4', ['part1', 'part2', '3part', 'part4']],
+        ['part1.part2["3part"]["4part"]', ['part1', 'part2', '3part', '4part']],
+        ['part1.part2[\'3part\'][\'4part\']', ['part1', 'part2', '3part', '4part']]
+    ];
+
+    for (const [pathString, expected] of data) {
+        // @ts-ignore
+        vm.assert.deepStrictEqual(ObjectPropertyAccessor2.getPathArray(pathString), expected);
+    }
+}
+
+/** */
+function testGetPathArray2() {
+    /** @type {[pathString: string, message: string][]} */
+    const data = [
+        ['?', 'Unexpected character: ?'],
+        ['.', 'Unexpected character: .'],
+        ['0', 'Unexpected character: 0'],
+        ['part1.[0]', 'Unexpected character: ['],
+        ['part1?', 'Unexpected character: ?'],
+        ['[part1]', 'Unexpected character: p'],
+        ['[0a]', 'Unexpected character: a'],
+        ['["part1"x]', 'Unexpected character: x'],
+        ['[\'part1\'x]', 'Unexpected character: x'],
+        ['["part1"]x', 'Unexpected character: x'],
+        ['[\'part1\']x', 'Unexpected character: x'],
+        ['part1..part2', 'Unexpected character: .'],
+
+        ['[', 'Path not terminated correctly'],
+        ['part1.', 'Path not terminated correctly'],
+        ['part1[', 'Path not terminated correctly'],
+        ['part1["', 'Path not terminated correctly'],
+        ['part1[\'', 'Path not terminated correctly'],
+        ['part1[""', 'Path not terminated correctly'],
+        ['part1[\'\'', 'Path not terminated correctly'],
+        ['part1[0', 'Path not terminated correctly'],
+        ['part1[0].', 'Path not terminated correctly']
+    ];
+
+    for (const [pathString, message] of data) {
+        assert.throws(() => ObjectPropertyAccessor2.getPathArray(pathString), {message});
+    }
+}
+
+
+/** */
+function testHasProperty() {
+    /** @type {[object: unknown, property: unknown, expected: boolean][]} */
+    const data = [
+        [{}, 'invalid', false],
+        [{}, 0, false],
+        [{valid: 0}, 'valid', true],
+        [{null: 0}, null, false],
+        [[], 'invalid', false],
+        [[], 0, false],
+        [[0], 0, true],
+        [[0], null, false],
+        ['string', 0, false],
+        ['string', 'length', false],
+        ['string', null, false]
+    ];
+
+    for (const [object, property, expected] of data) {
+        // @ts-ignore
+        assert.strictEqual(ObjectPropertyAccessor2.hasProperty(object, property), expected);
+    }
+}
+
+/** */
+function testIsValidPropertyType() {
+    /** @type {[object: unknown, property: unknown, expected: boolean][]} */
+    const data = [
+        [{}, 'invalid', true],
+        [{}, 0, false],
+        [{valid: 0}, 'valid', true],
+        [{null: 0}, null, false],
+        [[], 'invalid', false],
+        [[], 0, true],
+        [[0], 0, true],
+        [[0], null, false],
+        ['string', 0, false],
+        ['string', 'length', false],
+        ['string', null, false]
+    ];
+
+    for (const [object, property, expected] of data) {
+        // @ts-ignore
+        assert.strictEqual(ObjectPropertyAccessor2.isValidPropertyType(object, property), expected);
+    }
+}
+
+
+/** */
+function main() {
+    testGet1();
+    testGet2();
+    testSet1();
+    testSet2();
+    testDelete1();
+    testDelete2();
+    testSwap1();
+    testSwap2();
+    testGetPathString1();
+    testGetPathString2();
+    testGetPathArray1();
+    testGetPathArray2();
+    testHasProperty();
+    testIsValidPropertyType();
+}
+
+
+if (require.main === module) { testMain(main); }