diff --git a/spec/unit/dbg_spec.lua b/spec/unit/dbg_spec.lua
index 45c399b06..675761111 100644
--- a/spec/unit/dbg_spec.lua
+++ b/spec/unit/dbg_spec.lua
@@ -73,4 +73,14 @@ describe("Dbg module", function()
         re = {foo:bar()}
         assert.is.same(re, {1, 2, 3})
     end)
+
+    it("should set verbose", function()
+        assert.is_nil(dbg.is_verbose)
+        dbg:setVerbose(true)
+        assert.is_true(dbg.is_verbose)
+        dbg:setVerbose(false)
+        assert.is_false(dbg.is_verbose)
+        dbg:setVerbose()
+        assert.is_nil(dbg.is_verbose)
+    end)
 end)