density GraphicMagic test, and imageMagic test

test/densityGm.js

@@ -0,0 +1,28 @@
+
+var assert = require('assert');
+
+module.exports = function (gm, dir, finish, GM) {
+  'use strict';
+
+  // a two magic numbers
+  var NUMBER = 100;
+  var NUMBER2 = 200;
+
+  var g = gm.density(NUMBER, NUMBER2);
+
+  var gArgs = g.args();
+
+  assert.equal('convert', gArgs[0]);
+  assert.equal('-density', gArgs[1]);
+  assert.equal(NUMBER + 'x' + NUMBER2, gArgs[2]);
+
+  if (gm._options.imageMagick)
+    return finish();
+
+  if (!GM.integration)
+    return finish();
+
+  im.write(dir + '/density.png', function density (err) {
+    finish(err);
+  });
+};

test/densityIm.js

@@ -0,0 +1,28 @@
+
+var assert = require('assert');
+
+module.exports = function (gm, dir, finish, GM) {
+  'use strict';
+
+  // a magic number
+  var NUMBER = 100;
+
+  // image magic version
+  var im = gm.options({imageMagick: true}).density(NUMBER);
+
+  var imArgs = im.args();
+
+  assert.equal('convert', imArgs[0]);
+  assert.equal('-density', imArgs[1]);
+  assert.equal(NUMBER, imArgs[2]);
+
+  if (gm._options.imageMagick)
+    return finish();
+
+  if (!GM.integration)
+    return finish();
+
+  im.write(dir + '/density.png', function density (err) {
+    finish(err);
+  });
+};