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//===--- LoggerEntrypointTests.swift --------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import XCTest
@testable import PlaygroundLogger
fileprivate var numberOfDataSent: Int = 0
fileprivate func countData(_: NSData) -> Void {
numberOfDataSent += 1
}
class LoggerEntrypointTests: XCTestCase {
override class func setUp() {
super.setUp()
// Tell PlaygroundLogger to use our function for counting data.
PlaygroundLogger.sendData = countData
}
override class func tearDown() {
super.tearDown()
// Reset PlaygroundLogger.
PlaygroundLogger.sendData = unsetSendData
}
override func setUp() {
// Reset the data counter.
numberOfDataSent = 0
super.setUp()
}
func testRecursiveLogging() {
// Create a struct which, as a side effect of being logged, tries to log itself.
// This is representative of a playground where `self` is logged in places like a CustomStringConvertible conformance.
struct Struct: CustomStringConvertible {
let x: Int
let y: Int
var description: String {
// Capture the previous number of data sent so we can check against it later.
let previousNumberOfDataSent = numberOfDataSent
// This direct call to the logger mirrors what would happen if this property were instrumented by the playground logger and there were a bare reference to `self`.
PlaygroundLogger.logResult(self, named: "self", withIdentifier: 0, startLine: 1, endLine: 1, startColumn: 1, endColumn: 1)
// Since `description` is only ever called by logging, we can assert that no additional data was sent.
// If we called `description` by other means we'd need to vary this assertion to match.
XCTAssertEqual(previousNumberOfDataSent, numberOfDataSent, "We don't expect any more data to be sent by that previous log line!")
return "(\(x), \(y))"
}
}
let subject = Struct(x: 0, y: 0)
PlaygroundLogger.logResult(subject, named: "subject", withIdentifier: 0, startLine: 1, endLine: 1, startColumn: 1, endColumn: 1)
XCTAssertEqual(numberOfDataSent, 1, "We expect only one data to be sent over the course of this test")
}
}
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