error: no such module 'XCTest'

[zaneenders]

Hi, Was looking into this library for a project and got some errors running the tests locally.

Steps to Reproduce

git clone https://github.com/apple/swift-binary-parsing
git checkout 0.0.1
swift test

macOS: 26.1 (25B78)

swift --version
Apple Swift version 6.2.1 (swift-6.2.1-RELEASE)
Target: arm64-apple-macosx26.0
Build config: +assertions

Expected behavior

Passing tests for release branch.

Actual behavior

swift-snapshot-testing/Sources/SnapshotTesting/AssertSnapshot.swift:1:8: error: no such module 'XCTest'
  1 | import XCTest
    |        `- error: no such module 'XCTest'
  2 |
  3 | #if canImport(Testing)

Thanks,
Zane