Work with default return without expected params

Fix #31

template.go

@@ -228,7 +228,11 @@ const (
 				// if default expectation was set then invocations count should be greater than zero
 				if m.{{$method.Name}}Mock.defaultExpectation != nil && mm_atomic.LoadUint64(&m.after{{$method.Name}}Counter) < 1 {
 					{{- if $method.HasParams}}
-						m.t.Errorf("Expected call to {{$mock}}.{{$method.Name}} with params: %#v", *m.{{$method.Name}}Mock.defaultExpectation.params)
+						if m.{{$method.Name}}Mock.defaultExpectation.params == nil {
+							m.t.Error("Expected call to {{$mock}}.{{$method.Name}}")
+						} else {
+							m.t.Errorf("Expected call to {{$mock}}.{{$method.Name}} with params: %#v", *m.{{$method.Name}}Mock.defaultExpectation.params)
+						}
 					{{else}}
 						m.t.Error("Expected call to {{$mock}}.{{$method.Name}}")
 					{{end -}}

tests/formatter_mock_test.go

@@ -139,6 +139,20 @@ func TestFormatterMock_ReturnAfterSet(t *testing.T) {
 	formatterMock.FormatMock.Return("Should not work")
 }
 
+func TestFormatterMock_ReturnWithoutExpectForFixedArgsMethod(t *testing.T) {
+	// Test for issue https://github.com/gojuno/minimock/issues/31
+
+	tester := NewTesterMock(t)
+	defer tester.MinimockFinish()
+
+	tester.ErrorMock.Expect("Expected call to FormatterMock.Format")
+	tester.FailNowMock.Expect()
+
+	formatterMock := NewFormatterMock(tester)
+	formatterMock.FormatMock.Return("")
+	formatterMock.MinimockFinish()
+}
+
 func TestFormatterMock_Set(t *testing.T) {
 	tester := NewTesterMock(t)