Add mock finder #613

Job	Run time
Test Manuals Publisher / Run RSpec	1m 23s
Test Publisher / Run Minitest	8m 48s
Test Search Admin / Run RSpec	57s
Test Search API / Run RSpec	1m 32s
Test Service Manual Publisher / Run RSpec	1m 15s
Test Short URL Manager / Run RSpec	53s
Test Smart Answers / Run Minitest	3m 30s
Test Specialist Publisher / Run RSpec	1m 49s
Test Travel Advice Publisher / Run RSpec	1m 9s
Test Whitehall / minitest-matrix (4, 0)	2m 36s
Test Whitehall / minitest-matrix (4, 1)	2m 59s
Test Whitehall / minitest-matrix (4, 2)	2m 43s
Test Whitehall / minitest-matrix (4, 3)	2m 58s
Test Whitehall / Run Minitest	1s
	32m 33s

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