fix: load cache error when CacheDecoder object is not callable

[jamesgetx]

fix the code snippet self._cache = json.load(f, cls=CacheDecoder(self.client)) raise 'CacheDecoder' object is not callable

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[yliaog]

thanks for the pr, could you please add a test case?

[jamesgetx]

thanks for the pr, could you please add a test case?

Ok, I will add it later:)

[jamesgetx]

hi @yliaog. I have pushed the test case, but i'm not sure there is any other better solutions to test the code

[fabianvf]

/lgtm

[yliaog]

so if you run the test without the fix, the test will fail, and there will be exception, right?

[jamesgetx]

yes. without the fix, Discoverer.__init_cache will raise 'CacheDecoder' object is not callable then call self.invalidate_cache(), finally self._write_cache() will be called to modify Discoverer.__cache_file

[yliaog]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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