stubbing_spawn.js

var Cover = require('../../lib/resizers/resizer_stream');
var Transform = require('stream').Transform;

describe("ResizerStream", function() {

  it("should be a Transform stream", function() {
    var resizer = new Cover({ height: 100, width: 200 });
    expect(resizer).to.be.an.instanceof(Transform);
  });

  it("should emit an error if graphics magick exits with code != 0", function(end) {
    var stream = require('stream');
    var process = require('child_process');

    var convert = {
      stdin: new stream.Writable(),
      stdout: new stream.Readable(),
      stderr: new stream.Readable()
    };
    convert.stdin.on('*', function() {
      convert.emit('error');
    });

    sinon.stub(process, 'spawn', function() {
      console.log('spawn');
      return convert;
    });

    var resizer = new Cover({ height: 100, width: 200 });

    resizer.on('error', function() {
      end();
    });

    resizer.write('data');
  });

});