gson/src/test/java/com/google/gson/functional/StringTest.java

package com.google.gson.functional;

import com.google.gson.Gson;

import junit.framework.TestCase;

/**
 * Functional tests for Json serialization and deserialization of strings.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public class StringTest extends TestCase {
  private Gson gson;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    gson = new Gson();
  }
  
  public void testStringValueSerialization() throws Exception {
    String value = "someRandomStringValue";
    assertEquals('"' + value + '"', gson.toJson(value));
  }

  public void testStringValueDeserialization() throws Exception {
    String value = "someRandomStringValue";
    String actual = gson.fromJson("\"" + value + "\"", String.class);
    assertEquals(value, actual);
  }

  public void testSingleQuoteInStringSerialization() throws Exception {
    String valueWithQuotes = "beforeQuote'afterQuote";
    String jsonRepresentation = gson.toJson(valueWithQuotes);
    assertEquals(valueWithQuotes, gson.fromJson(jsonRepresentation, String.class));
  }

  public void testEscapedCtrlNInStringSerialization() throws Exception {
    String value = "a\nb";
    String json = gson.toJson(value);
    assertEquals("\"a\\nb\"", json);
  }

  public void testEscapedCtrlNInStringDeserialization() throws Exception {
    String json = "'a\\nb'";
    String actual = gson.fromJson(json, String.class);
    assertEquals("a\nb", actual);
  }

  public void testEscapedCtrlRInStringSerialization() throws Exception {
    String value = "a\rb";
    String json = gson.toJson(value);
    assertEquals("\"a\\rb\"", json);
  }

  public void testEscapedCtrlRInStringDeserialization() throws Exception {
    String json = "'a\\rb'";
    String actual = gson.fromJson(json, String.class);
    assertEquals("a\rb", actual);
  }

  public void testEscapedBackslashInStringSerialization() throws Exception {
    String value = "a\\b";
    String json = gson.toJson(value);
    assertEquals("\"a\\\\b\"", json);
  }

  public void testEscapedBackslashInStringDeserialization() throws Exception {
    String actual = gson.fromJson("'a\\\\b'", String.class);
    assertEquals("a\\b", actual);
  }

  public void testSingleQuoteInStringDeserialization() throws Exception {
    String value = "beforeQuote'afterQuote";
    String actual = gson.fromJson("\"" + value + "\"", String.class);
    assertEquals(value, actual);
  }

  public void testEscapingQuotesInStringSerialization() throws Exception {
    String valueWithQuotes = "beforeQuote\"afterQuote";
    String jsonRepresentation = gson.toJson(valueWithQuotes);
    String target = gson.fromJson(jsonRepresentation, String.class);
    assertEquals(valueWithQuotes, target);
  }

  public void testEscapingQuotesInStringDeserialization() throws Exception {
    String value = "beforeQuote\\\"afterQuote";
    String actual = gson.fromJson("\"" + value + "\"", String.class);
    String expected = "beforeQuote\"afterQuote";
    assertEquals(expected, actual);
  }

  public void testStringValueAsSingleElementArraySerialization() throws Exception {
    String[] target = {"abc"};
    assertEquals("[\"abc\"]", gson.toJson(target));
    assertEquals("[\"abc\"]", gson.toJson(target, String[].class));
  }

  public void testStringValueAsSingleElementArrayDeserialization() throws Exception {
    String value = "someRandomStringValue";
    String actual = gson.fromJson("[\"" + value + "\"]", String.class);
    assertEquals(value, actual);
  }
}