Can't write snapshot tests without dev-addresses feature (to set package address to 0)

[mdgeorge4153]

The new package system no longer supports the [dev-addresses] section. Some users have snapshot tests that depend on the root package having a deterministic address. For example, some tests use type_name or @Package and compare the output against a fixed value.

In the old system, you could set package = 0 in [dev-addresses] and get this kind of deterministic behavior. It's not clear how to achieve this in the current system.

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[mdgeorge4153]

Note that this kind of test violates the principle that the way code behaves during testing matches the way it behaves on-chain (since the on-chain addresses will be different).

When running sui move test, the current behavior is to use the package's published address if it has one (from Published.toml), and use 0 otherwise. This is the same behavior as the old system, and some tests (including in the framework) depend on that behavior, so we shouldn't change the default behavior (e.g. to always use 0 for the root package in tests).

[mdgeorge4153]

I wonder (a) if we need to be able to do this for dependencies or only for the main package under test, and (b) whether we need to support setting an arbitrary address or just 0.