Tests: clean up some `XCTAssert` usage (#5544)
Tests: clean up some `XCTAssert` usage (#5544)

Use the explicitly specified boolean state "macro"s rather than
converting the results to a true value.  This simplifies the checks
and makes it less likely to accidentally miss the `!`.
apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager