diff --git a/test/TopSelectorSpecificity.js b/test/TopSelectorSpecificity.js
new file mode 100644
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--- /dev/null
+++ b/test/TopSelectorSpecificity.js
@@ -0,0 +1,10 @@
+var expect = require('chai').expect,
+    metric = require('../metrics/TopSelectorSpecificity.js');
+
+describe('The top-selector-specificity metric', function () {
+	it('should count only the specificity of the child selector of a :not identifier', function () {
+		expect(metric.measure(':not(body)')).to.equal(1);
+		expect(metric.measure(':not(.sidebar)')).to.equal(10);
+		expect(metric.measure(':not(h1#main)')).to.equal(101);
+	});
+});
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