fuzz: Consolidate fuzzing TestingSetup initialization

fuzz: Consolidate fuzzing TestingSetup initialization

Previously, the {Basic,}TestingSetup for fuzzers were set up in many ways:

1. Calling InitializeFuzzingContext, which implicitly constructs a static
   const BasicTestingSetup
2. Directly constructing a static const BasicTestingSetup in the initialize_*
   function
3. Directly constructing a static TestingSetup and reproducing the
   initialization arguments (I'm assuming because
   InitializeFuzzingContext only initializes a BasicTestingSetup)

The new, relatively-simple MakeFuzzingContext function allows us to
consolidate these methods of initialization by being flexible enough to
be used in all situations. It:

1. Is templated so that we can choose to initialize any of
   the *TestingSetup classes
2. Has sane defaults which are often used in fuzzers but are also
   easily overridable
3. Returns a unique_ptr, explicitly transferring ownership to the caller
   to deal with according to its situation

情報元 - fuzz: Consolidate fuzzing TestingSetup initialization · bitcoin/[email protected] · GitHub

fuzz: Consolidate fuzzing TestingSetup initialization · bitcoin/bitcoin@713314a · GitHub
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