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JsonCollectorsTest.java
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JsonCollectorsTest.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.json;
import static org.mutabilitydetector.unittesting.MutabilityAssert.assertInstancesOf;
import static org.mutabilitydetector.unittesting.MutabilityMatchers.areImmutable;
import java.util.stream.Stream;
import org.eclipse.ditto.json.assertions.DittoJsonAssertions;
import org.junit.Test;
/**
* Unit test for {@link JsonCollectors}.
*/
@SuppressWarnings("ClassWithTooManyFields")
public final class JsonCollectorsTest {
private static final JsonKey ID_KEY = JsonFactory.newKey("id");
private static final JsonKey STATE_KEY = JsonFactory.newKey("state");
private static final JsonKey MANUFACTURER_KEY = JsonFactory.newKey("manufacturer");
private static final JsonKey NAME_KEY = JsonFactory.newKey("name");
private static final JsonKey COUNTRY_KEY = JsonFactory.newKey("country");
private static final JsonValue ID = JsonFactory.newValue(4223);
private static final JsonValue STATE = JsonFactory.newValue("off");
private static final JsonValue NAME = JsonFactory.newValue("ACME");
private static final JsonValue COUNTRY = JsonFactory.newValue("Germany");
private static final JsonValue MANUFACTURER = JsonFactory.newObjectBuilder() //
.set(NAME_KEY, NAME) //
.set(COUNTRY_KEY, COUNTRY) //
.build();
private static final JsonField ID_FIELD = JsonFactory.newField(ID_KEY, ID);
private static final JsonField STATE_FIELD = JsonFactory.newField(STATE_KEY, STATE);
private static final JsonField MANUFACTURER_FIELD = JsonFactory.newField(MANUFACTURER_KEY, MANUFACTURER);
private static final JsonObject KNOWN_JSON_OBJECT = JsonFactory.newObjectBuilder() //
.set(ID_FIELD) //
.set(STATE_FIELD) //
.set(MANUFACTURER_FIELD) //
.build();
private static final JsonArray KNOWN_JSON_ARRAY = JsonFactory.newArrayBuilder().add(ID) //
.add(STATE) //
.add(NAME) //
.add(COUNTRY) //
.build();
@Test
public void assertImmutability() {
assertInstancesOf(JsonCollectors.class, areImmutable());
}
@Test
public void collectingFieldsOfObjectReturnsEqualObject() {
final JsonObject jsonObject = KNOWN_JSON_OBJECT.stream() //
.collect(JsonCollectors.fieldsToObject());
DittoJsonAssertions.assertThat(jsonObject).isEqualTo(KNOWN_JSON_OBJECT);
}
@Test
public void collectingFieldKeysOfObjectReturnsExpectedArray() {
final JsonArray expectedArray = JsonFactory.newArrayBuilder() //
.add(JsonFactory.newValue(ID_KEY.toString())) //
.add(JsonFactory.newValue(STATE_KEY.toString())) //
.add(JsonFactory.newValue(MANUFACTURER_KEY.toString())) //
.build();
final JsonArray actualArray = KNOWN_JSON_OBJECT.stream() //
.collect(JsonCollectors.fieldKeysToArray());
DittoJsonAssertions.assertThat(actualArray).isEqualTo(expectedArray);
}
@Test
public void collectingFieldValuesOfObjectReturnsExpectedArray() {
final JsonArray expectedArray = JsonFactory.newArrayBuilder() //
.add(ID) //
.add(STATE) //
.add(MANUFACTURER) //
.build();
final JsonArray actualArray = KNOWN_JSON_OBJECT.stream() //
.collect(JsonCollectors.fieldValuesToArray());
DittoJsonAssertions.assertThat(actualArray).isEqualTo(expectedArray);
}
@Test
public void collectingValuesOfArrayReturnsEqualArray() {
final JsonArray jsonArray = KNOWN_JSON_ARRAY.stream() //
.collect(JsonCollectors.valuesToArray());
DittoJsonAssertions.assertThat(jsonArray).isEqualTo(KNOWN_JSON_ARRAY);
}
@Test
public void collectingObjectsReturnsExpectedObject() {
final JsonObject anotherJsonObject = JsonFactory.newObjectBuilder() //
.set("Foo", "Bar") //
.build();
final JsonObject expectedObject = JsonFactory.newObjectBuilder() //
.setAll(KNOWN_JSON_OBJECT) //
.setAll(anotherJsonObject)//
.build();
final JsonObject actualObject =
Stream.of(KNOWN_JSON_OBJECT, anotherJsonObject).collect(JsonCollectors.objectsToObject());
DittoJsonAssertions.assertThat(actualObject).isEqualTo(expectedObject);
}
}