I have a model `A` which `belongs_to` `B`. And I'm trying to write a unit test
with `A` as `subject`:
```
expect(subject.b).to receive(:to_s)
```
Yet this spec always fails, saying that the instance of `B` did not receive the
message, notwithstanding I have put `binding.pry` in the actual code to run and
verified that `a.b.to_s` gets called.
```
class A
def validate_my_field
binding.pry # this fires
if b.to_s
super
end
end
```
I have even tried:
```
expect(a).to receive(:b).and_return(b)
expect(b).to receive(:to_s)
```
And:
```
expect_any_instance_of(b.class).to receive(:to_s)
```
Yet all expectations for `to_s` fail. Why could this be?
I'm in Rails 6 with Rspec 3.8.0.
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