src/test/java/org/apache/commons/text/similarity/ParameterizedEditDistanceFromTest.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.commons.text.similarity;

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

import java.util.stream.Stream;

import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;


/**
 * Tests {@link EditDistanceFrom}.
 *
 * @param <R> The {@link EditDistance} return type.
 */
public class ParameterizedEditDistanceFromTest<R> {

    public static Stream<Arguments> parameters() {
        return Stream.of(
                Arguments.of(new HammingDistance(), "Sam I am.", "Ham I am.", 1),
                Arguments.of(new HammingDistance(), "Japtheth, Ham, Shem", "Japtheth, HAM, Shem", 2),
                Arguments.of(new HammingDistance(), "Hamming", "Hamming", 0),

                Arguments.of(new LevenshteinDistance(), "Apache", "a patchy", 4),
                Arguments.of(new LevenshteinDistance(), "go", "no go", 3),
                Arguments.of(new LevenshteinDistance(), "go", "go", 0),

                Arguments.of(new LevenshteinDistance(4), "Apache", "a patchy", 4),
                Arguments.of(new LevenshteinDistance(4), "go", "no go", 3),
                Arguments.of(new LevenshteinDistance(0), "go", "go", 0),

                Arguments.of(
                    (EditDistance<Boolean>) (left, right) -> left == right || (left != null && left.equals(right)),
                    "Bob's your uncle.",
                    "Every good boy does fine.",
                    false));
    }

    @ParameterizedTest
    @MethodSource("parameters")
    public void test(final EditDistance<R> editDistance, final CharSequence left, final CharSequence right,
            final R distance) {
        final EditDistanceFrom<R> editDistanceFrom = new EditDistanceFrom<>(editDistance, left);
        assertThat(editDistanceFrom.apply(right)).isEqualTo(distance);
    }

}