tests

Write test for deleting middle assay #348

Job	Run time
Tests (mysql, rails test test/unit)	31m 19s
Tests (mysql, rails test test/functional)	46m 53s
Tests (mysql, rails test test/integration)	17m 47s
Tests (mysql, rspec spec)	4m 3s
Tests (mysql, rake assets:precompile)	4m 16s
Tests (mysql, rake db:setup)	3m 46s
Tests (mysql, rake db:migrate)	5m 25s
Tests (mysql, rake seek:upgrade)	4m 37s
Tests (postgres, rails test test/unit)	28m 49s
Tests (sqlite3, rails test test/unit)	21m 34s
	2h 48m 29s

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