filer/tests/lib/test-utils.js

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var Filer = require('../../src');
var IndexedDBTestProvider = require('./indexeddb.js');
var MemoryTestProvider = require('./memory.js');
var Url = require('url');
var _provider;
var _fs;
function uniqueName() {
if(!uniqueName.seed) {
uniqueName.seed = Date.now();
}
return 'filer-testdb-' + uniqueName.seed++;
}
function findBestProvider() {
var providers = Filer.FileSystem.providers;
return providers.IndexedDB.isSupported() ?
IndexedDBTestProvider : MemoryTestProvider;
}
function getUrlParams() {
// Check if we are running in node
if(!global.location) {
return null;
}
var url = Url.parse(global.location.href, true);
return url.query;
}
function getProviderType() {
var defaultProvider = 'default';
var queryString = getUrlParams();
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// If the environment is node or the query string is empty,
// the memory provider will be used.
if(!queryString) {
return defaultProvider;
}
return queryString['filer-provider'] || defaultProvider;
}
// Run fn() in an environment with indexedDB available
// either as-is, or shimmed, removing when done.
function shimIndexedDB(fn) {
var addShim = !Filer.FileSystem.providers.IndexedDB.isSupported();
if(addShim) {
global.indexedDB = require('fake-indexeddb');
}
fn();
if(addShim) {
delete global.indexedDB;
}
}
function setup(callback) {
// In browser we support specifying the provider via the query string
// (e.g., ?filer-provider=IndexedDB). If not specified, we use
// the Memory provider by default.
var providerType = getProviderType();
var name = uniqueName();
switch(providerType.toLowerCase()) {
case 'indexeddb':
_provider = new IndexedDBTestProvider(name);
break;
case 'memory':
_provider = new MemoryTestProvider(name);
break;
case 'default':
default:
var BestProvider = findBestProvider();
_provider = new BestProvider(name);
break;
}
// Allow passing FS flags on query string
var flags = global.filerArgs && global.filerArgs.flags ?
global.filerArgs.flags : 'FORMAT';
// Create a file system and wait for it to get setup
_provider.init();
function complete(err, fs) {
if(err) throw err;
_fs = fs;
callback();
}
return new Filer.FileSystem({
name: name,
provider: _provider.provider,
flags: flags
}, complete);
}
function fs() {
if(!_fs) {
throw new Error('TestUtil: call setup() before fs()');
}
return _fs;
}
function provider() {
if(!_provider) {
throw new Error('TestUtil: call setup() before provider()');
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}
return _provider;
}
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function shell(options) {
var _fs = fs();
return new _fs.Shell(options);
}
function cleanup(callback) {
if(!_provider) {
return;
}
_provider.cleanup(function() {
_provider = null;
_fs = null;
callback();
});
}
function typedArrayEqual(a, b) {
if(!(a && b)) {
return false;
}
if(a.length !== b.length) {
return false;
}
for(var i = 0; i < a.length; ++ i) {
if(a[i] !== b[i]) {
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return false;
}
}
return true;
}
/**
* Parse JSON with serialized Buffers
*/
const parseBJSON = json =>
JSON.parse(json, (key, value) =>
value && value.type === 'Buffer' ?
Buffer.from(value.data) :
value
);
module.exports = {
uniqueName: uniqueName,
setup: setup,
fs: fs,
shell: shell,
provider: provider,
providers: {
IndexedDB: IndexedDBTestProvider,
Memory: MemoryTestProvider
},
cleanup: cleanup,
typedArrayEqual: typedArrayEqual,
parseBJSON,
shimIndexedDB
};