Ecto.Adapter.TestTransactions

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Specifies the adapter test transactions API.

These adapter functions work by starting a transaction and storing
the connection back in the pool with an open transaction. At the end
of the test, the transaction is rolled back, reverting all data added
during tests.

Note this approach only works if the connection pool has size of 1
and does not support any overflow.

## Postgres test example

    defmodule TestRepo do
      use Ecto.Repo, adapter: Ecto.Adapters.Postgres

      # When testing it is important to set `size=1&max_overflow=0` so that
      # the repo will only have one connection
      def conf do
        parse_url "ecto://postgres:postgres@localhost/test?size=1&max_overflow=0"
      end
    end

    # All tests in this module will be wrapped in transactions
    defmodule PostTest do
      # Tests that use the shared repository should be sync
      use ExUnit.Case, async: false
      alias Ecto.Adapters.Postgres

      setup do
        Postgres.begin_test_transaction(TestRepo)

        on_exit fn ->
          Postgres.rollback_test_transaction(TestRepo)
        end
      end

      test "create comment" do
        assert %Post{} = TestRepo.insert(%Post{})
      end
    end
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