Source library execution failed

[xuhuanzy]

my execution steps

1. git clone
2. luarocks remove busted --force
3. luarocks make
4. busted --coverage --lpath="" --cpath="" --output=gtest -Xoutput --color

[  FAILED  ] 1 test, listed below:
[  FAILED  ] spec\insulate-expose_spec.lua:6: Isolation from Busted in normal blocks
[  ERROR   ] 2 errors, listed below:
[  ERROR   ] spec\insulate-expose_spec.lua:10: Isolation from Busted in insulated blocks
[  ERROR   ] spec\insulate-expose_spec.lua:14: Isolation from Busted in exposed blocks

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)