Cargo Features

[dependencies]
test-pallet = { version = "3.0.0", default-features = false, features = ["std"] }
default = std

The std feature is set by default whenever test-pallet is added without default-features = false somewhere in the dependency tree.

std default

Enables std of parity-scale-codec ^2.0.0, frame-support ^3.0.0, and frame-system ^3.0.0

test-pallet has 2 features without comments.