/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.paimon.utils;

import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;

/** Tests for {@link ReflectionUtils}. */
public class ReflectionUtilsTest {

    @Test
    public void testSetPrivateFieldValueOnDeclaringClass() throws Exception {
        Child child = new Child();
        ReflectionUtils.setPrivateFieldValue(child, "ownField", "new-value");
        assertThat((String) ReflectionUtils.getPrivateFieldValue(child, "ownField"))
                .isEqualTo("new-value");
    }

    @Test
    public void testSetPrivateFieldValueWalksSuperclass() throws Exception {
        Child child = new Child();
        ReflectionUtils.setPrivateFieldValue(child, "parentField", "from-parent");
        assertThat((String) ReflectionUtils.getPrivateFieldValue(child, "parentField"))
                .isEqualTo("from-parent");
    }

    @Test
    public void testSetPrivateFieldValueUnknownFieldThrows() {
        assertThatThrownBy(() -> ReflectionUtils.setPrivateFieldValue(new Child(), "missing", "x"))
                .isInstanceOf(NoSuchFieldException.class);
    }

    private static class Parent {
        @SuppressWarnings("unused")
        private String parentField = "parent";
    }

    private static class Child extends Parent {
        @SuppressWarnings("unused")
        private String ownField = "child";
    }
}
