test: add tests for time in wasm32-unknown-unknown

[unvalley]

Motivation

Closes #7360

Solution

Add minimal tests on wasm32-unknown-unknown to check the intended behavior from #7360

• Instant::now() panics on unknown WASM.
• Runtime without time feature (rt only) does not panic.
• With time feature enabled, using time APIs (sleep) panics on unknown WASM.

[Darksonn]

The wasm target runs according to this configuration:

tokio/.github/workflows/ci.yml

Lines 1041 to 1057 in 0922aa2

	wasm32-unknown-unknown:
	name: test tokio for wasm32-unknown-unknown
	needs: basics
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Install Rust ${{ env.rust_stable }}
	uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: ${{ env.rust_stable }}
	- name: Install wasm-pack
	uses: taiki-e/install-action@wasm-pack
	- uses: Swatinem/rust-cache@v2
	- name: test tokio
	run: wasm-pack test --node -- --features "macros sync"
	working-directory: tokio

Here, time is not enabled, so this means that we do not run these tests with time enabled at all! You'll have to modify the ci.yml file to test the time case.

[unvalley]

Oops, thank you for clarifying! Do we also need to add rt feature here?

[Darksonn]

We probably need to run multiple combinations here to really test this.

[Darksonn]

Any chance you could expand this job to run both with and without time?

[unvalley]

sorry for late, I've updated how it tests