generator/src/test/java/org/apache/kafka/message/MessageGeneratorTest.java

/*
 * 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.kafka.message;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.fail;

@Timeout(120)
public class MessageGeneratorTest {

    @Test
    public void testCapitalizeFirst() throws Exception {
        assertEquals("", MessageGenerator.capitalizeFirst(""));
        assertEquals("AbC", MessageGenerator.capitalizeFirst("abC"));
    }

    @Test
    public void testLowerCaseFirst() throws Exception {
        assertEquals("", MessageGenerator.lowerCaseFirst(""));
        assertEquals("fORTRAN", MessageGenerator.lowerCaseFirst("FORTRAN"));
        assertEquals("java", MessageGenerator.lowerCaseFirst("java"));
    }

    @Test
    public void testFirstIsCapitalized() throws Exception {
        assertFalse(MessageGenerator.firstIsCapitalized(""));
        assertTrue(MessageGenerator.firstIsCapitalized("FORTRAN"));
        assertFalse(MessageGenerator.firstIsCapitalized("java"));
    }

    @Test
    public void testToSnakeCase() throws Exception {
        assertEquals("", MessageGenerator.toSnakeCase(""));
        assertEquals("foo_bar_baz", MessageGenerator.toSnakeCase("FooBarBaz"));
        assertEquals("foo_bar_baz", MessageGenerator.toSnakeCase("fooBarBaz"));
        assertEquals("fortran", MessageGenerator.toSnakeCase("FORTRAN"));
    }

    @Test
    public void stripSuffixTest() throws Exception {
        assertEquals("FooBa", MessageGenerator.stripSuffix("FooBar", "r"));
        assertEquals("", MessageGenerator.stripSuffix("FooBar", "FooBar"));
        assertEquals("Foo", MessageGenerator.stripSuffix("FooBar", "Bar"));
        try {
            MessageGenerator.stripSuffix("FooBar", "Baz");
            fail("expected exception");
        } catch (RuntimeException e) {
        }
    }

    @Test
    public void testConstants() {
        assertEquals(MessageGenerator.UNSIGNED_SHORT_MAX, 0xFFFF);
        assertEquals(MessageGenerator.UNSIGNED_INT_MAX, 0xFFFFFFFFL);
    }
}