Something like the following will setup the datastore helper and
create the datastore-indexes-auto.xml:
LocalDatastoreServiceTestConfig dsConfig = new
LocalDatastoreServiceTestConfig();
File location = new File("war/WEB-INF/appengine-generated/
local_db.bin");
dsConfig.setBackingStoreLocation(location.getAbsolutePath());
// And it seems that for the local ds service to be able
to load the local_db.bin file, the local
// environment must match the app id and version as stored
in the file.
String xml;
try {
xml = FileUtils.readFileToString(new File("war/WEB-INF/
appengine-web.xml"));
}
catch (IOException e) {
throw new RuntimeException(e);
}
String application = StringUtils.substringBetween(xml,
"<application>", "</application>");
String version = StringUtils.substringBetween(xml,
"<version>", "</version>");
// Default behavior is to keep everything in RAM. Tell the
local services to use the file system
dsConfig.setNoStorage(false);
// Create the local services.
gaeDatastoreHelper = new LocalServiceTestHelper(dsConfig);
gaeDatastoreHelper.setEnvAppId(application);
gaeDatastoreHelper.setEnvVersionId(version);
// Calling setUp() will start the local ds service and
load the local_db.bin file.
gaeDatastoreHelper.setUp();
This way, you can even write tests against a previously generated
local_db.bin if you want.
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