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node-red-nodes/test/utility/exif/94-exif_spec.js

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2014-11-04 16:07:32 +01:00
/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var should = require("should");
var sinon = require('sinon');
var fs = require("fs");
var exifNode = require("../../../utility/exif/94-exif.js");
var helper = require('../../../../node-red/test/nodes/helper.js');
describe('exif node', function() {
beforeEach(function(done) {
helper.startServer(done);
});
afterEach(function(done) {
helper.unload();
helper.stopServer(done);
});
it('extracts location data from Exif data of JPEG', function(done) {
var exif = require('exif');
var ExifImage = exif.ExifImage;
// the jpg file is a single black dot but it was originally a photo taken at IBM Hursley
var data = fs.readFileSync("./exif_test_image.jpg", null); // extracting genuine exif data to be fed back as the result of the stubbed ExifImage constructor
var eD;
new ExifImage({ image : data }, function (error, exifData) {
if(error) {
done(error);
} else {
eD = exifData;
}
var flow = [{id:"exifNode1", type:"exif", wires:[["helperNode1"]]},
{id:"helperNode1", type:"helper"}];
helper.load(exifNode, flow, function() {
var exifNode1 = helper.getNode("exifNode1");
var helperNode1 = helper.getNode("helperNode1");
helperNode1.on("input", function(msg) {
msg.location.lat.should.equal(50.95624); // this data is stored in the jpg file
msg.location.lon.should.equal(-1.36701);
done();
});
var stub = sinon.stub(ExifImage.prototype, 'loadImage', function(error, callback) {
stub.restore();
callback(null, eD);
});
exifNode1.receive({payload:data});
});
});
});
});