in Sources/XCTest/Private/TestListing.swift [23:32]
func printTestList() {
let list = testSuite.list()
let tests = list.count == 1 ? "test" : "tests"
let bundleName = testSuite.findBundleTestSuite()?.name ?? "<<unknown bundle>>"
print("Listing \(list.count) \(tests) in \(bundleName):\n")
for entry in testSuite.list() {
print(entry)
}
}