diff --git a/test/filtered.test.js b/test/filtered.test.js
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+/**
+ * Test the filtered field.
+ * 
+ * When compiled, a rule provides metainformation fields like index, constant...etc
+ * one of this fields is the "filtered field".
+ * 
+ * This field gives information about whether a property is filtered or not.
+ * 
+ * A property is filtered if it was activated inside a filter. In the following cartocss
+ * code marker-color.filtered will be true because is inside a population filter.
+ * 
+ * #layer {
+ *   maker-width: 20;
+ *   [population > 100] {
+ *    marker-color: red; // 
+ *   }
+ * }
+ */
+var assert = require('assert');
+var Carto = require('../lib/carto/index.js');
+var renderer = new Carto.RendererJS({strict: true});
+
+
+describe('Field:filtered propery', function () {
+    it('should be false when the property is not filtered', function () {
+        var style = `
+            #layer {
+                marker-fill: red;
+            }`;
+        var layers = renderer.render(style).layers[0].shader;
+        assert(!layers['marker-fill'].filtered);
+    });
+
+    it('should be true when the property is filtered', function () {
+        style = `
+        #layer {
+            [foo > 30]{
+                marker-fill: red;
+            }
+        }`;
+
+        var layers = renderer.render(style).layers[0].shader;
+        assert(layers['marker-fill'].filtered);
+    });
+
+    it('should be true when the property is filtered at first level', function () {
+        style = `
+        #layer [foo > 30]{
+            marker-fill: red;
+        }`;
+
+        var layers = renderer.render(style).layers[0].shader;
+        assert(layers['marker-fill'].filtered);
+    });
+
+    it('should be false when the property is not filterd but there is another filtered properties', function () {
+        style = `
+        #layer {
+            marker-fill: red;
+            [bar < 200]{
+                marker-allow-overlap: false;
+            }
+        }`;
+
+        var layers = renderer.render(style).layers[0].shader;
+
+        assert(!layers['marker-fill'].filtered);
+        assert(layers['marker-allow-overlap'].filtered);
+    });
+
+    it('should be true when the property is filtered and have a default value', function () {
+        style = `
+        #layer {
+            marker-fill: red;
+            [bar < 200]{
+                marker-fill: blue;
+            }
+        }`;
+
+        var layers = renderer.render(style).layers[0].shader;
+
+        assert(layers['marker-fill'].filtered);
+    });
+});
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