[FrameworkBundle][TwigBridge] Fix test compatibility with 4.x components #33055
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our symfony Tests extends other component's tests. By being compatible with symfony 4.x we now extends class that have return type signature which is not doable in branch 3.4 because of support of php 5.5. (see https://travis-ci.org/symfony/symfony/jobs/569345176)
This PR replaces setup and teardown by
@after
and@before
annotation in order to keep the same behavior and compatibility