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JsonCharEscaperTest.java
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JsonCharEscaperTest.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.assertj.core.api.Assertions.assertThat;
import static org.mutabilitydetector.unittesting.AllowedReason.assumingFields;
import static org.mutabilitydetector.unittesting.MutabilityAssert.assertInstancesOf;
import static org.mutabilitydetector.unittesting.MutabilityMatchers.areImmutable;
import java.util.stream.IntStream;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import com.eclipsesource.json.Json;
import com.eclipsesource.json.JsonValue;
/**
* Unit test for {@link JsonCharEscaper}.
* Test cases are oriented on https://tools.ietf.org/html/rfc8259#section-7
*/
public final class JsonCharEscaperTest {
private static final String SHORTHAND_CONTROL_CHARACTERS = "\b\f\n\r\t";
private static final String SHORTHAND_CONTROL_CHARACTER_NAMES = "bfnrt";
private JsonCharEscaper underTest;
@Before
public void setUp() {
underTest = JsonCharEscaper.getInstance();
}
@Test
@Ignore("https://github.com/MutabilityDetector/MutabilityDetector/issues/185")
public void assertImmutability() {
assertInstancesOf(JsonCharEscaper.class,
areImmutable(),
assumingFields("replacements").areNotModifiedAndDoNotEscape());
}
@Test
public void doNotEscapeNormalCharactersBeforeBackslash() {
final int start = 0x0020; // ' '
final int end = 0x00FFFF;
IntStream.range(start, end)
.filter(i -> i != '"' && i != '\\')
.forEach(character -> {
final String notEscaped = underTest.apply(character);
assertThat(notEscaped)
.isNull();
});
}
@Test
public void escapeQuote() {
final String escapedQuote = underTest.apply((int) '"');
assertThat(escapedQuote).isEqualTo("\\\"");
}
@Test
public void escapeReverseSolidus() {
final String escapedReverseSolidus = underTest.apply((int) '\\');
assertThat(escapedReverseSolidus).isEqualTo("\\\\");
}
@Test
public void escapeControlCharactersWithoutShorthands() {
IntStream.range(0, 0x1F).forEach(character -> {
if (SHORTHAND_CONTROL_CHARACTERS.chars().noneMatch(i -> i == character)) {
final String unicodeEscaped = underTest.apply(character);
assertThat(unicodeEscaped)
.describedAs("Do not escape character %s", Integer.toHexString(character))
.startsWith("\\u");
assertThat(Integer.parseInt(unicodeEscaped.substring(2), 16)).isEqualTo(character);
}
});
}
@Test
public void escapeControlCharactersWithShorthands() {
SHORTHAND_CONTROL_CHARACTERS.chars().forEach(character -> {
final String escaped = underTest.apply(character);
final String expected =
"\\" + SHORTHAND_CONTROL_CHARACTER_NAMES.charAt(SHORTHAND_CONTROL_CHARACTERS.indexOf(character));
assertThat(escaped).isEqualTo(expected);
});
}
@Test
public void minimalJsonString() {
final String rawString = "";
final JsonValue jsonValue = Json.value(rawString);
final String actualOwn = ImmutableJsonString.of(rawString).toString();
final String actual = jsonValue.toString();
assertThat(actualOwn).isEqualTo(actual);
}
}