I am trying to understand how cargo builds crates within workspaces.

For this Cargo.toml at root directory in crossbeam project.

user@ultrabook:~/Packages/crossbeam$ cat Cargo.toml 
[package]
name = "crossbeam"
# When publishing a new version:
# - Update CHANGELOG.md
# - Update README.md (when increasing major or minor version)
# - Run './tools/publish.sh crossbeam <version>'
version = "0.8.4"
edition = "2021"
rust-version = "1.61"
license = "MIT OR Apache-2.0"
repository = "https://github.com/crossbeam-rs/crossbeam"
homepage = "https://github.com/crossbeam-rs/crossbeam"
description = "Tools for concurrent programming"
keywords = ["atomic", "garbage", "non-blocking", "lock-free", "rcu"]
categories = ["concurrency", "memory-management", "data-structures", "no-std"]
exclude = ["/.*", "/ci", "/tools"]

[features]
default = ["std"]

# Enable to use APIs that require `std`.
# This is enabled by default.
std = [
  "alloc",
  "crossbeam-channel/std",
  "crossbeam-deque/std",
  "crossbeam-epoch/std",
  "crossbeam-queue/std",
  "crossbeam-utils/std",
]

# Enable to use APIs that require `alloc`.
# This is enabled by default and also enabled if the `std` feature is enabled.
alloc = ["crossbeam-epoch/alloc", "crossbeam-queue/alloc"]

[dependencies]
crossbeam-channel = { version = "0.5.10", path = "crossbeam-channel", default-features = false, optional = true }
crossbeam-deque = { version = "0.8.4", path = "crossbeam-deque", default-features = false, optional = true }
crossbeam-epoch = { version = "0.9.17", path = "crossbeam-epoch", default-features = false, optional = true }
crossbeam-queue = { version = "0.3.10", path = "crossbeam-queue", default-features = false, optional = true }
crossbeam-utils = { version = "0.8.18", path = "crossbeam-utils", default-features = false, features = ["atomic"] }

Why does cargo test use crossbeam-epoch v0.9.18 instead of the version 0.9.17 specified above as per Cargo.toml?

user@ultrabook:~/Packages/crossbeam$ cargo clean
warning: ignoring `resolver.feature-unification` without `-Zfeature-unification`
     Removed 15710 files, 3.9GiB total
user@ultrabook:~/Packages/crossbeam$ cargo t
warning: ignoring `resolver.feature-unification` without `-Zfeature-unification`
   Compiling atomic-maybe-uninit v0.3.13
   Compiling crossbeam-utils v0.8.21 (/home/user/Packages/crossbeam/crossbeam-utils)
   Compiling crossbeam-epoch v0.9.18 (/home/user/Packages/crossbeam/crossbeam-epoch)
   Compiling crossbeam-channel v0.5.15 (/home/user/Packages/crossbeam/crossbeam-channel)
   Compiling crossbeam-queue v0.3.12 (/home/user/Packages/crossbeam/crossbeam-queue)
   Compiling crossbeam-deque v0.8.6 (/home/user/Packages/crossbeam/crossbeam-deque)
   Compiling crossbeam v0.8.4 (/home/user/Packages/crossbeam)
    Finished `test` profile [unoptimized + debuginfo] target(s) in 1.03s
     Running unittests src/lib.rs (/home/user/~/.cargo/build-cache/debug/deps/crossbeam-4e531462c2db7866)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running tests/subcrates.rs (/home/user/~/.cargo/build-cache/debug/deps/subcrates-1e40968ff29872ef)

running 5 tests
test channel ... ok
test deque ... ok
test epoch ... ok
test queue ... ok
test utils ... ok

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