diff --git a/spec/insulate-expose_spec.lua b/spec/insulate-expose_spec.lua
index bba84bd6..3273cc10 100644
--- a/spec/insulate-expose_spec.lua
+++ b/spec/insulate-expose_spec.lua
@@ -1,6 +1,20 @@
 assert.is_nil(package.loaded.pl)
 assert.is_nil(package.loaded['pl.file'])
 
+describe('Isolation from Busted', function()
+  it('in normal blocks', function()
+    assert.is_nil(package.loaded['pl.path'])
+  end)
+
+  insulate('in insulated blocks', function()
+    assert.is_nil(package.loaded['pl.path'])
+  end)
+
+  expose('in exposed blocks', function()
+    assert.is_nil(package.loaded['pl.path'])
+  end)
+end)
+
 describe('Tests insulation', function()
   insulate('environment inside insulate', function()
     pl = require 'pl'