Allow soft expected calls that don't match arguments

Author: ryanplusplus

spec/mach_spec.lua

@@ -412,6 +412,14 @@ describe('The mach library', function()
     f:may_be_called_with(4):when(function() end)
   end)
 
+  it('should allow soft expectations with any arguments to be called', function()
+    f:may_be_called_with_any_arguments():when(function() f(4) end)
+  end)
+
+  it('should allow soft expectations with any arguments to be omitted', function()
+    f:may_be_called_with_any_arguments():when(function() end)
+  end)
+
   it('should fail if may_be_called is used after a call has already been specified', function()
     should_fail_with('call already specified', function()
       f:should_be_called():may_be_called()
@@ -424,6 +432,12 @@ describe('The mach library', function()
     end)
   end)
 
+  it('should fail if may_be_called_with_any_arguments is used after a call has already been specified', function()
+    should_fail_with('call already specified', function()
+      f:should_be_called():may_be_called_with_any_arguments()
+    end)
+  end)
+
   it('should handle unexpected calls outside of an expectation', function()
     should_fail_with('unexpected function call f(1, 2, 3)', function()
       mach.mock_function('f')(1, 2, 3)

src/mach/Expectation.lua

@@ -139,8 +139,18 @@ function expectation:should_be_called()
   return self:should_be_called_with()
 end
 
+function expectation:may_be_called_with_any_arguments()
+  if self._call_specified then
+    error('call already specified', 2)
+  end
+
+  self._call_specified = true
+  table.insert(self._calls, ExpectedCall(self._m, { required = false, ignore_args = true }))
+  return self
+end
+
 function expectation:may_be_called_with(...)
-  if self._call_specified == true then
+  if self._call_specified then
     error('call already specified', 2)
   end
 
@@ -150,7 +160,7 @@ function expectation:may_be_called_with(...)
 end
 
 function expectation:may_be_called()
-  if self._call_specified == true then
+  if self._call_specified then
     error('call already specified', 2)
   end