add - TestSartorisDulwichDeps class for testing Sartoris dulwich methods - tests need to be fleshed out.

Change-Id: I215675968ef500d78cacc686b1e2db9839204478
fix - Ensure path to test repo exists.

Change-Id: I9f84ae71f0f47b545413c4933d07af7d20c82e82