com.github.jcustenborder.kafka.connect.utils.GenericAssertions.java Source code

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Here is the source code for com.github.jcustenborder.kafka.connect.utils.GenericAssertions.java

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/**
 * Copyright  2016 Jeremy Custenborder (jcustenborder@gmail.com)
 *
 * Licensed 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 com.github.jcustenborder.kafka.connect.utils;

import com.google.common.base.Strings;
import com.google.common.collect.MapDifference;
import com.google.common.collect.Maps;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import java.util.function.Supplier;

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class GenericAssertions {
    private GenericAssertions() {

    }

    static class MapDifferenceSupplier implements Supplier<String> {
        final MapDifference<?, ?> mapDifference;
        final String method;

        public MapDifferenceSupplier(MapDifference<?, ?> mapDifference, String method) {
            this.mapDifference = mapDifference;
            this.method = method;
        }

        @Override
        public String get() {
            try (Writer w = new StringWriter()) {
                try (BufferedWriter writer = new BufferedWriter(w)) {
                    writer.append(String.format("Map for actual.%s() does not match expected.%s().", this.method,
                            this.method));
                    writer.newLine();
                    Map<?, ? extends MapDifference.ValueDifference<?>> differences = mapDifference
                            .entriesDiffering();
                    if (!differences.isEmpty()) {
                        writer.append("Keys with Differences");
                        writer.newLine();
                        for (Map.Entry<?, ? extends MapDifference.ValueDifference<?>> kvp : differences
                                .entrySet()) {
                            writer.append("  ");
                            writer.append(kvp.getKey().toString());
                            writer.newLine();

                            writer.append("    expected:");
                            writer.append(kvp.getValue().leftValue().toString());
                            writer.newLine();

                            writer.append("    actual:");
                            writer.append(kvp.getValue().rightValue().toString());
                            writer.newLine();
                        }
                    }

                    Map<?, ?> entries = mapDifference.entriesOnlyOnLeft();
                    writeEntries(writer, "Only in expected map", entries);

                    Map<?, ?> onlyInActual = mapDifference.entriesOnlyOnRight();
                    writeEntries(writer, "Only in actual map", onlyInActual);
                }
                return w.toString();
            } catch (IOException ex) {
                throw new IllegalStateException(ex);
            }
        }

        private void writeEntries(BufferedWriter writer, String header, Map<?, ?> entries) throws IOException {
            if (!entries.isEmpty()) {
                writer.append(header);
                writer.newLine();

                for (Map.Entry<?, ?> kvp : entries.entrySet()) {
                    writer.append("  ");
                    writer.append(kvp.getKey().toString());
                    writer.append(": ");
                    writer.append(kvp.getValue().toString());
                    writer.newLine();
                }
                writer.newLine();
            }
        }
    }

    public static void assertMap(Map<String, ?> expected, Map<String, ?> actual, String message) {
        if (null == expected && null == actual) {
            return;
        }

        String prefix = Strings.isNullOrEmpty(message) ? "" : message + ": ";
        assertNotNull(expected, prefix + "expected cannot be null");
        assertNotNull(actual, prefix + "actual cannot be null");
        MapDifference<String, ?> mapDifference = Maps.difference(expected, actual);
        assertTrue(mapDifference.areEqual(), new MapDifferenceSupplier(mapDifference, prefix));
    }
}