182 lines
5.8 KiB
Java
182 lines
5.8 KiB
Java
/*
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* Copyright (C) 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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import static com.google.common.truth.Truth.assertThat;
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import static org.junit.Assert.fail;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import com.google.gson.internal.Streams;
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import com.google.gson.stream.JsonReader;
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import java.io.CharArrayReader;
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import java.io.CharArrayWriter;
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import java.io.IOException;
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import java.io.StringReader;
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import org.junit.Test;
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/**
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* Unit test for {@link JsonParser}
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*
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* @author Inderjeet Singh
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*/
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public class JsonParserTest {
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@Test
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public void testParseInvalidJson() {
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try {
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JsonParser.parseString("[[]");
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fail();
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} catch (JsonSyntaxException expected) { }
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}
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@Test
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public void testParseUnquotedStringArrayFails() {
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JsonElement element = JsonParser.parseString("[a,b,c]");
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assertThat(element.getAsJsonArray().get(0).getAsString()).isEqualTo("a");
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assertThat(element.getAsJsonArray().get(1).getAsString()).isEqualTo("b");
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assertThat(element.getAsJsonArray().get(2).getAsString()).isEqualTo("c");
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assertThat(element.getAsJsonArray()).hasSize(3);
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}
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@Test
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public void testParseString() {
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String json = "{a:10,b:'c'}";
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JsonElement e = JsonParser.parseString(json);
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assertThat(e.isJsonObject()).isTrue();
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assertThat(e.getAsJsonObject().get("a").getAsInt()).isEqualTo(10);
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assertThat(e.getAsJsonObject().get("b").getAsString()).isEqualTo("c");
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}
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@Test
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public void testParseEmptyString() {
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JsonElement e = JsonParser.parseString("\" \"");
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assertThat(e.isJsonPrimitive()).isTrue();
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assertThat(e.getAsString()).isEqualTo(" ");
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}
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@Test
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public void testParseEmptyWhitespaceInput() {
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JsonElement e = JsonParser.parseString(" ");
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assertThat(e.isJsonNull()).isTrue();
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}
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@Test
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public void testParseUnquotedSingleWordStringFails() {
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assertThat(JsonParser.parseString("Test").getAsString()).isEqualTo("Test");
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}
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@Test
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public void testParseUnquotedMultiWordStringFails() {
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String unquotedSentence = "Test is a test..blah blah";
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try {
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JsonParser.parseString(unquotedSentence);
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fail();
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} catch (JsonSyntaxException expected) { }
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}
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@Test
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public void testParseMixedArray() {
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String json = "[{},13,\"stringValue\"]";
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JsonElement e = JsonParser.parseString(json);
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assertThat(e.isJsonArray()).isTrue();
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JsonArray array = e.getAsJsonArray();
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assertThat(array.get(0).toString()).isEqualTo("{}");
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assertThat(array.get(1).getAsInt()).isEqualTo(13);
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assertThat(array.get(2).getAsString()).isEqualTo("stringValue");
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}
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private static String repeat(String s, int times) {
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StringBuilder stringBuilder = new StringBuilder(s.length() * times);
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for (int i = 0; i < times; i++) {
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stringBuilder.append(s);
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}
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return stringBuilder.toString();
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}
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/** Deeply nested JSON arrays should not cause {@link StackOverflowError} */
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@Test
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public void testParseDeeplyNestedArrays() throws IOException {
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int times = 10000;
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// [[[ ... ]]]
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String json = repeat("[", times) + repeat("]", times);
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int actualTimes = 0;
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JsonArray current = JsonParser.parseString(json).getAsJsonArray();
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while (true) {
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actualTimes++;
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if (current.isEmpty()) {
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break;
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}
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assertThat(current.size()).isEqualTo(1);
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current = current.get(0).getAsJsonArray();
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}
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assertThat(actualTimes).isEqualTo(times);
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}
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/** Deeply nested JSON objects should not cause {@link StackOverflowError} */
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@Test
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public void testParseDeeplyNestedObjects() throws IOException {
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int times = 10000;
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// {"a":{"a": ... {"a":null} ... }}
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String json = repeat("{\"a\":", times) + "null" + repeat("}", times);
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int actualTimes = 0;
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JsonObject current = JsonParser.parseString(json).getAsJsonObject();
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while (true) {
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assertThat(current.size()).isEqualTo(1);
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actualTimes++;
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JsonElement next = current.get("a");
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if (next.isJsonNull()) {
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break;
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} else {
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current = next.getAsJsonObject();
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}
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}
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assertThat(actualTimes).isEqualTo(times);
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}
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@Test
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public void testParseReader() {
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StringReader reader = new StringReader("{a:10,b:'c'}");
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JsonElement e = JsonParser.parseReader(reader);
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assertThat(e.isJsonObject()).isTrue();
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assertThat(e.getAsJsonObject().get("a").getAsInt()).isEqualTo(10);
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assertThat(e.getAsJsonObject().get("b").getAsString()).isEqualTo("c");
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}
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@Test
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public void testReadWriteTwoObjects() throws Exception {
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Gson gson = new Gson();
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CharArrayWriter writer = new CharArrayWriter();
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BagOfPrimitives expectedOne = new BagOfPrimitives(1, 1, true, "one");
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writer.write(gson.toJson(expectedOne).toCharArray());
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BagOfPrimitives expectedTwo = new BagOfPrimitives(2, 2, false, "two");
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writer.write(gson.toJson(expectedTwo).toCharArray());
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CharArrayReader reader = new CharArrayReader(writer.toCharArray());
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JsonReader parser = new JsonReader(reader);
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parser.setLenient(true);
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JsonElement element1 = Streams.parse(parser);
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JsonElement element2 = Streams.parse(parser);
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BagOfPrimitives actualOne = gson.fromJson(element1, BagOfPrimitives.class);
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assertThat(actualOne.stringValue).isEqualTo("one");
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BagOfPrimitives actualTwo = gson.fromJson(element2, BagOfPrimitives.class);
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assertThat(actualTwo.stringValue).isEqualTo("two");
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}
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}
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