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Initial pieces of XCTestObservation and XCTestObservationCenter
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‎Sources/XCTest/ObjectWrapper.swift

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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//
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// ObjectWrapper.swift
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// Utility type for adapting implementors of a `class` protocol to Hashable
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//
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/// A `Hashable` representation of an object and its ObjectIdentifier. This is
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/// useful because Swift classes aren't implicitly hashable based on identity.
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internal struct ObjectWrapper<T>: Hashable {
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let object: T
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let objectIdentifier: ObjectIdentifier
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var hashValue: Int { return objectIdentifier.hashValue }
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}
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internal func ==<T>(lhs: ObjectWrapper<T>, rhs: ObjectWrapper<T>) -> Bool {
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return lhs.objectIdentifier == rhs.objectIdentifier
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}

‎Sources/XCTest/XCTestObservation.swift

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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//
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// XCTestObservation.swift
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// Hooks for being notified about progress during a test run.
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//
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/// `XCTestObservation` provides hooks for being notified about progress during a
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/// test run.
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/// - seealso: `XCTestObservationCenter`
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public protocol XCTestObservation: class {
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/// Called just before a test begins executing.
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/// - Parameter testCase: The test case that is about to start. Its `name`
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/// property can be used to identify it.
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func testCaseWillStart(testCase: XCTestCase)
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/// Called when a test failure is reported.
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/// - Parameter testCase: The test case that failed. Its `name` property
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/// can be used to identify it.
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/// - Parameter description: Details about the cause of the test failure.
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/// - Parameter filePath: The path to the source file where the failure
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/// was reported, if available.
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/// - Parameter lineNumber: The line number in the source file where the
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/// failure was reported.
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func testCase(testCase: XCTestCase, didFailWithDescription description: String, inFile filePath: String?, atLine lineNumber: UInt)
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/// Called just after a test finishes executing.
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/// - Parameter testCase: The test case that finished. Its `name` property
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/// can be used to identify it.
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func testCaseDidFinish(testCase: XCTestCase)
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}
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// All `XCTestObservation` methods are optional, so empty default implementations are provided
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public extension XCTestObservation {
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func testCaseWillStart(testCase: XCTestCase) {}
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func testCase(testCase: XCTestCase, didFailWithDescription description: String, inFile filePath: String?, atLine lineNumber: UInt) {}
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func testCaseDidFinish(testCase: XCTestCase) {}
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}

‎Sources/XCTest/XCTestObservationCenter.swift

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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//
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// XCTestObservationCenter.swift
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// Notification center for test run progress events.
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//
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/// Provides a registry for objects wishing to be informed about progress
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/// during the course of a test run. Observers must implement the
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/// `XCTestObservation` protocol
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/// - seealso: `XCTestObservation`
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public class XCTestObservationCenter {
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private static var center = XCTestObservationCenter()
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private var observers = Set<ObjectWrapper<XCTestObservation>>()
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/// Registration should be performed on this shared instance
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public class func sharedTestObservationCenter() -> XCTestObservationCenter {
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return center
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}
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/// Register an observer to receive future events during a test run. The order
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/// in which individual observers are notified about events is undefined.
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public func addTestObserver(testObserver: XCTestObservation) {
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observers.insert(testObserver.wrapper)
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}
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/// Remove a previously-registered observer so that it will no longer receive
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/// event callbacks.
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public func removeTestObserver(testObserver: XCTestObservation) {
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observers.remove(testObserver.wrapper)
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}
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internal func testCaseWillStart(testCase: XCTestCase) {
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forEachObserver { $0.testCaseWillStart(testCase) }
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}
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internal func testCase(testCase: XCTestCase, didFailWithDescription description: String, inFile filePath: String?, atLine lineNumber: UInt) {
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forEachObserver { $0.testCase(testCase, didFailWithDescription: description, inFile: filePath, atLine: lineNumber) }
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}
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internal func testCaseDidFinish(testCase: XCTestCase) {
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forEachObserver { $0.testCaseDidFinish(testCase) }
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}
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private func forEachObserver(@noescape body: XCTestObservation -> Void) {
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for observer in observers {
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body(observer.object)
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}
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}
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}
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private extension XCTestObservation {
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var wrapper: ObjectWrapper<XCTestObservation> {
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return ObjectWrapper(object: self, objectIdentifier: ObjectIdentifier(self))
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}
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}

‎Tests/Functional/Observation/main.swift

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// RUN: %{swiftc} %s -o %{built_tests_dir}/Observation
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// RUN: %{built_tests_dir}/Observation > %t || true
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// RUN: %{xctest_checker} %t %s
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#if os(Linux) || os(FreeBSD)
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import XCTest
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#else
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import SwiftXCTest
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#endif
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class Observer: XCTestObservation {
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var startedTestCaseNames = [String]()
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var failureDescriptions = [String]()
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var finishedTestCaseNames = [String]()
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func testCaseWillStart(testCase: XCTestCase) {
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startedTestCaseNames.append(testCase.name)
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}
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func testCase(testCase: XCTestCase, didFailWithDescription description: String, inFile filePath: String?, atLine lineNumber: UInt) {
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failureDescriptions.append(description)
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}
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func testCaseDidFinish(testCase: XCTestCase) {
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finishedTestCaseNames.append(testCase.name)
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}
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}
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let observer = Observer()
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class Observation: XCTestCase {
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static var allTests: [(String, Observation -> () throws -> Void)] {
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return [
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("test_one", test_one),
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("test_two", test_two),
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("test_three", test_three),
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]
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}
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// CHECK: Test Case 'Observation.test_one' started.
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// CHECK: Test Case 'Observation.test_one' passed \(\d+\.\d+ seconds\).
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func test_one() {
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XCTAssertEqual(observer.startedTestCaseNames, [])
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XCTAssertEqual(observer.failureDescriptions, [])
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XCTAssertEqual(observer.finishedTestCaseNames, [])
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XCTestObservationCenter.sharedTestObservationCenter().addTestObserver(observer)
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}
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// CHECK: Test Case 'Observation.test_two' started.
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// CHECK: .*/Observation/main.swift:\d+: error: Observation.test_two : failed - fail!
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// CHECK: Test Case 'Observation.test_two' failed \(\d+\.\d+ seconds\).
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func test_two() {
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XCTAssertEqual(observer.startedTestCaseNames, ["Observation.test_two"])
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XCTAssertEqual(observer.finishedTestCaseNames,["Observation.test_one"])
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XCTFail("fail!")
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XCTAssertEqual(observer.failureDescriptions, ["failed - fail!"])
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XCTestObservationCenter.sharedTestObservationCenter().removeTestObserver(observer)
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}
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// CHECK: Test Case 'Observation.test_three' started.
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// CHECK: Test Case 'Observation.test_three' passed \(\d+\.\d+ seconds\).
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func test_three() {
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XCTAssertEqual(observer.startedTestCaseNames, ["Observation.test_two"])
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XCTAssertEqual(observer.finishedTestCaseNames,["Observation.test_one"])
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}
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}
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XCTMain([testCase(Observation.allTests)])
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// CHECK: Executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds
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// CHECK: Total executed 3 tests, with 1 failure \(0 unexpected\) in \d+\.\d+ \(\d+\.\d+\) seconds

‎XCTest.xcodeproj/project.pbxproj

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AE7DD60A1C8E81A0006FC722 /* TestFiltering.swift in Sources */ = {isa = PBXBuildFile; fileRef = AE7DD6081C8E81A0006FC722 /* TestFiltering.swift */; };
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