Add test for CartoCSS error reporting on POST to layergroup

test/acceptance/multilayer.js

@@ -429,6 +429,33 @@ suite('multilayer', function() {
       );
     });
 
+    test("layergroup creation fails if CartoCSS is bogus", function(done) {
+      var layergroup =  {
+        stat_tag: 'random_tag',
+        version: '1.0.0',
+        layers: [
+           { options: {
+               sql: 'select 1 as cartodb_id, !pixel_height! as h'
+                  + 'ST_Buffer(!bbox!, -32*greatest(!pixel_width!,!pixel_height!)) as the_geom_webmercator',
+               cartocss: '#layer { polygon-fit:red; }', 
+               cartocss_version: '2.0.1' 
+             } }
+        ]
+      };
+      assert.response(server, {
+          url: '/tiles/layergroup',
+          method: 'POST',
+          headers: {host: 'localhost', 'Content-Type': 'application/json' },
+          data: JSON.stringify(layergroup)
+      }, {}, function(res) {
+          assert.equal(res.statusCode, 400, res.body);
+          var parsed = JSON.parse(res.body);
+          assert.ok(parsed.errors[0].match(/^style0/));
+          assert.ok(parsed.errors[0].match(/Unrecognized rule: polygon-fit/));
+          done();
+      });
+    });
+
     suiteTeardown(function(done) {
 
         // This test will add map_style records, like