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- Due to `assert_nothing_raised` this test was not really testing
anything.
- So updated it to assert that the query gives expected result.
- Also in general we can use `connection.unprepared_statement` for
testing queries w/o prepared statements but it can't be used in this
case. This test cases was added because when prepared_statements
config is set to false, then DetermineIfPreparableVisitor module
does not extended by Arel visitor resulting into an error. Ref: https://github.com/rails/rails/pull/22748.
- Because DetermineIfPreparableVisitor module does not get added to the
visitor chain only if prepared_statements is false while **setting up
connection**, not when `unprepared_statement` is used.
- I have also added an assertion for making sure that prepared_config
is set to false from the start, so that nobody accidentally removes
the connection setup using `arunit_without_prepared_statements` and
replaces it with stubs or unprepared_statement.
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