Add test for mock model policy resolution and refactor `getRepository… #395

Job	Run time
cs-stan / Coding Standard & Static Analysis	23s
testsuite / testsuite-linux (8.3, highest, false)	26s
testsuite / testsuite-linux (8.1, lowest, false)	23s
testsuite / testsuite-linux (8.1, highest, false)	15s
testsuite / testsuite-linux (8.4, highest, false)	15s
testsuite / testsuite-linux (8.2, highest, false)	13s
	1m 55s

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