cargo test fails with no-default-features

[rnbguy]

Bug Summary

Cargo test without default features fails to compile.

cargo test --package ibc --no-default-features

Details

The root cause is the ibc package is compiled with default serde flag. Yet, there are places (shown in the compile errors), where some of the serde enabled crates and functionalities are imported or used without serde flag.

Version

c20e491

[rnbguy]

As suggested by @Farhad-Shabani, the simple solution is to add cargo test --package ibc --no-default-features in CI.

Also, it'd be nice, if we can cargo test for possible feature combinations. cargo-hack offers an easy CLI for doing this.