Disallow andWillReturn from being called when there is no call

Author: ryanplusplus

mock.lua

@@ -54,7 +54,6 @@ function ExpectedCall:getReturnValues(...)
 end
 
 
-
 MockExpectation = {}
 
 function MockExpectation:new(m)
@@ -70,7 +69,12 @@ function MockExpectation:new(m)
 end
 
 function MockExpectation:andWillReturn(...)
+  if #self._calls == 0 then
+    error('cannot set return value for an unspecified call', 2)
+  end
+
   self._calls[#self._calls]:setReturnValues(...)
+
   return self
 end
 

spec/mock_spec.lua

@@ -245,6 +245,14 @@ describe('The mock library', function()
     end)
   end)
 
+  it('should fail if andWillReturn is not preceeded by shouldBeCalled or shouldBeCalledWith', function()
+    shouldFailWith('cannot set return value for an unspecified call', function()
+      local f = mock:mockFunction('f')
+
+      mock(f):andWillReturn(1)
+    end)
+  end)
+
   -- ordering
 
   -- allowed vs. not allowed functions on the expectation (ie: state machine for expectation)