define(["IDBFS"], function(IDBFS) { describe('fs.truncate', function() { beforeEach(function() { this.db_name = mk_db_name(); this.fs = new IDBFS.FileSystem({ name: this.db_name, flags: 'FORMAT' }); }); afterEach(function() { indexedDB.deleteDatabase(this.db_name); delete this.fs; }); it('should be a function', function() { expect(typeof this.fs.truncate).toEqual('function'); }); it('should error when length is negative', function() { var complete = false; var _error, _result; var that = this; var contents = "This is a file."; that.fs.writeFile('/myfile', contents, function(error) { if(error) throw error; that.fs.truncate('/myfile', -1, function(error) { _error = error; complete = true; }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toBeDefined(); }); }); it('should error when path is not a file', function() { var complete = false; var _error, _result; var that = this; that.fs.truncate('/', 0, function(error) { _error = error; complete = true; }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toBeDefined(); }); }); it('should truncate a file', function() { var complete = false; var _error, _result; var that = this; var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]); var truncated = new Uint8Array([1]); that.fs.open('/myfile', 'w', function(error, result) { if(error) throw error; var fd = result; that.fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) { if(error) throw error; that.fs.close(fd, function(error) { if(error) throw error; that.fs.truncate('/myfile', 1, function(error) { _error = error; that.fs.readFile('/myfile', function(error, result) { if(error) throw error; _result = result; complete = true; }); }); }); }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toEqual(null); expect(_result).toEqual(truncated); }); }); it('should pad a file with zeros when the length is greater than the file size', function() { var complete = false; var _error, _result; var that = this; var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]); var truncated = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 0]); that.fs.open('/myfile', 'w', function(error, result) { if(error) throw error; var fd = result; that.fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) { if(error) throw error; that.fs.close(fd, function(error) { if(error) throw error; that.fs.truncate('/myfile', 9, function(error) { _error = error; that.fs.readFile('/myfile', function(error, result) { if(error) throw error; _result = result; complete = true; }); }); }); }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toEqual(null); expect(_result).toEqual(truncated); }); }); it('should update the file size', function() { var complete = false; var _error, _result; var that = this; var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]); that.fs.open('/myfile', 'w', function(error, result) { if(error) throw error; var fd = result; that.fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) { if(error) throw error; that.fs.close(fd, function(error) { if(error) throw error; that.fs.truncate('/myfile', 0, function(error) { _error = error; that.fs.stat('/myfile', function(error, result) { if(error) throw error; _result = result; complete = true; }); }); }); }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toEqual(null); expect(_result.size).toEqual(0); }); }); it('should truncate a valid descriptor', function() { var complete = false; var _error, _result; var that = this; var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]); that.fs.open('/myfile', 'w', function(error, result) { if(error) throw error; var fd = result; that.fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) { if(error) throw error; that.fs.ftruncate(fd, 0, function(error) { _error = error; that.fs.fstat(fd, function(error, result) { if(error) throw error; _result = result; complete=true; }); }); }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toEqual(null); expect(_result.size).toEqual(0); }); }); it('should follow symbolic links', function() { var complete = false; var _error, _result, _result2; var that = this; var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]); that.fs.open('/myfile', 'w', function(error, result) { if(error) throw error; var fd = result; that.fs.write(fd, buffer, 0, buffer.length, 0, function(error, result) { if(error) throw error; that.fs.close(fd, function(error) { if(error) throw error; that.fs.symlink('/myfile', '/mylink', function(error) { if(error) throw error; that.fs.truncate('/mylink', 0, function(error) { _error = error; that.fs.stat('/myfile', function(error, result) { if(error) throw error; _result = result; that.fs.lstat('/mylink', function(error, result) { if(error) throw error; _result2 = result; complete=true; }); }); }); }); }); }); }); waitsFor(function() { return complete; }, 'test to complete', DEFAULT_TIMEOUT); runs(function() { expect(_error).toEqual(null); expect(_result.size).toEqual(0); expect(_result2.size).not.toEqual(0); }); }); }); });