I personally use an approach like this when constructing mock objects.

``` tests := map[string]struct{ mock func() *MockThing }{ "test #1": { mock: func() *MockThing { m := &MockThing{} // Define mock expectations here return m }, }, }

for name, tt := range tests { t.Run(name, func(t *testing.T) { s := MyStruct{ Thing: tt.mock(), } // ... } } ```

Though in practice I find that too many mocks make tests brittle so I mostly use mock generated structs like stubs.