## Description
Closes: #XXXX
This PR adds `sdk.Context` arg to `NewIntegrationApp`. This allows us to set the context updatable while verifying `begin/end block` logic in integration tests.
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## Description
fix various linting issues
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## Description
### Issue
Some values (like chain ID) were being leaked from the previous block/initialization into PrepareProposal and ProcessProposal, these values are only available if:
1. The node has never been stopped since the genesis block (as these values are set on `InitChain`)
2. The node has already commited a block (as the previous header was being used for the new state of prepare and process proposal).
So if a node is restarted, during the first prepare and process proposal these values won't be populated, and that will cause issues if they are being used.
### Solution
Remove any previous header information from a previous block in the prepare and process proposal contexts, making things consistent at every height.
- Added ChainID to baseapp
- Use an empty header in Commit() with only the chain id set
- Fix context for prepare and process proposal
Closes: #15269
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- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed
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## Description
This PR introduces the `cmdtest` package, offering a lightweight wrapper around cobra commands to simplify testing CLI utilities.
I backfilled tests for the `version` command, which was an example of a very simple test setup; and for the `export` command, which was more involved due to the server and client context requirements.
I did notice that there are some existing tests for some utilities, but the `cmdtest` package follows a simple pattern that has been easy to use successfully in [the relayer](https://github.com/cosmos/relayer/blob/main/internal/relayertest/system.go) and in other projects outside the Cosmos ecosystem.
While filling in these tests, I started removing uses of `cmd.Print`, as that is the root cause of issues like #8498, #7964, #15167, and possibly others. Internal to cobra, the print family of methods write to `cmd.OutOrStderr()` -- meaning that if the authors call `cmd.SetOutput()` before executing the command, the output will be written to stdout as expected; otherwise it will go to stderr. I don't understand why that would be the default behavior, but it is probably too late to change from cobra's side.
Instead of `cmd.Print`, we prefer to `fmt.Fprint(cmd.OutOrStdout())` or `fmt.Fprint(cmd.ErrOrStderr())` as appropriate, giving an unambiguous destination for output. And the new tests collect those outputs in plain `bytes.Buffer` values so that we can assert their content appropriately.
In the longer term, I would like to deprecate and eventually remove the `testutil` package's `ApplyMockIO` method and its `BufferWriter` and `BufferReader` types, as they are unnecessary indirection when a simpler solution exists. But that can wait until `cmdtest` has propagated through the codebase more.
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