     it 'should throw error when tank is empty', ->
       tank = new Tank
 
-      callRelease = ->
+      ( ->
         tank.release()
-      callRelease.should.throw 'Tank is empty'
+      ).should.throw 'Tank is empty'
 
   describe 'having a drain option', ->
     it 'should not have size option specified', ->
-      invalidInstantiation = ->
+      ( ->
         new Tank
           drain: (data, cb) ->
           size: 5
-
-      invalidInstantiation.should.throw 'Cannot specify size option for a tank with drain option'
+      ).should.throw 'Cannot specify size option for a tank with drain option'
 
     it 'should not be able to release data manually', ->
       tank = new Tank
         drain: (data, cb) ->
           do cb
 
-      invalidCall = ->
+      ( ->
         do tank.release
-
-      invalidCall.should.throw 'Content is automatically released through the callback given in drain option'
+      ).should.throw 'Content is automatically released through the callback given in drain option'
 
     it 'should release any filled item using the promisifiable drain function', (done) ->
       tank = new Tank

      tank = new Tank
        size: 1
      tank.fill('test')
      callFillAgain = ->
        tank.fill('again')
      callFillAgain.should.throw 'Tank is full'

    it 'should emit full event when the tank becomes full', (done) ->
      tank = new Tank

      tank.fill 'test'

      do tank.seal
      ( ->
        tank.fill 'test2'
      ).should.throw 'Cannot fill sealed tanks'

    it 'should emit end event if becomes empty when sealed', (done) ->
      tank = new Tank
