Open connection in tests if needed #30171
Merged
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Our tests sometimes create a DbCommand (e.g. by calling CreateDbcommand on a queryable, see ExecuteOurDbCommand in RelationalQueryAsserter), and then execute it, assuming the connection is open. This currently works because the test store happens to do UseSqlServer with an open connection. But with some integration of DbDataSource in Npgsql, the connection isn't open at that point; this makes the test open it if necessary.