Tests were missing in previous commit

test/acceptance/stats/mapnik_stats_layergroup.js

@@ -513,7 +513,7 @@ describe('Create mapnik layergroup', function() {
             version: '1.4.0',
             layers: [
                 layerWithMetadata(mapnikLayer4, {
-                    sample: 3
+                    sample: { num_rows: 3 }
                 })
             ]
         });
@@ -529,6 +529,31 @@ describe('Create mapnik layergroup', function() {
         });
     });
 
+    it('can specify sample columns', function(done) {
+        var testClient = new TestClient({
+            version: '1.4.0',
+            layers: [
+                layerWithMetadata(mapnikLayer4, {
+                    sample: {
+                        num_rows: 3,
+                        include_columns:  [ 'cartodb_id', 'address', 'the_geom' ]
+                    }
+                })
+            ]
+        });
+
+        testClient.getLayergroup(function(err, layergroup) {
+            assert.ifError(err);
+            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
+            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
+            assert(layergroup.metadata.layers[0].meta.stats.sample.length > 0);
+            const expectedCols = [ 'cartodb_id', 'address', 'the_geom' ].sort();
+            assert.deepEqual(Object.keys(layergroup.metadata.layers[0].meta.stats.sample[0]).sort(), expectedCols);
+            testClient.drain(done);
+        });
+    });
+
+
     it('should only provide requested optional metadata', function(done) {
         var testClient = new TestClient({
             version: '1.4.0',