Add unit tests for mapping allergy codeable concepts #988

Job	Run time
Checkstyle	43s
Spotbugs	53s
Integration Tests	9m 24s
Unit Tests	2m 17s
End-to-End Testing	3m 43s
Build & Publish Docker Images (service, gp2gp, .)	1m 19s
Build & Publish Docker Images (wiremock, gp2gp-wiremock, .)	42s
Build & Publish Docker Images (mock-mhs-adaptor, gp2gp-mock-mhs, .)	1m 5s
Build & Publish Docker Images (gpcc-mock, gp2gp-gpcc-mock, ./docker/gpcc-mock)	21s
Build & Publish Docker Images (gpc-api-mock, gp2gp-gpc-api-mock, ./docker/gpc-api-mock)	21s
Build & Publish Docker Images (sds-api-mock, gp2gp-sds-api-mock, ./docker/sds-api-mock)	44s
	21m 32s

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