added call_migrate_works function in test modules.

[juggernaut09]

Closes #715

• Made changes to packages/vm/src/calls.rs
• Added fn call_migrate_works in tests module.

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• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x//spec/)
• Added relevant rustdoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
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• Review Codecov Report in the comment section below once CI passes

[webmaster128]

Looks good overall. If you apply the suggestions and mark this as ready for review, we can merge.

[webmaster128]

We need a different call_migrate here than in the integration test. The integration test uses https://github.com/CosmWasm/cosmwasm/blob/master/packages/vm/src/testing/calls.rs (i.e. from the testing:: module) but here we use a similar but different function from https://github.com/CosmWasm/cosmwasm/blob/master/packages/vm/src/calls.rs. This does not require the MigrateMsg type. Instead pass the migrate message as JSON.

[webmaster128]

I just realized the tests don't pass. If you want to run most tests locally, use the big first block from https://github.com/CosmWasm/cosmwasm/blob/master/README.md#developing. Or pick some of the commands that are relevant.

[webmaster128]

Looks good to me. Is this ready to merge?

[juggernaut09]

Looks good to me. Is this ready to merge?

@webmaster128 it is ready to merge.

[webmaster128]

Merci!