What s New in Testing
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1 #WWDC18 What s New in Testing Session 403 Honza Dvorsky, Xcode Engineer Ethan Vaughan, Xcode Engineer 2018 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.
2 Code coverage Test selection and ordering Parallel testing
3 Code coverage Test selection and ordering Parallel testing
4 Code Coverage 9.3
5 Code Coverage 9.3 Xcode 9.3
6 Code Coverage 9.3 Xcode 9.3 Performance and accuracy
7 Code Coverage 9.3 Xcode 9.3 Performance and accuracy Target selection
8 Code Coverage 9.3 Xcode 9.3 Performance and accuracy Target selection xccov
9 Code Coverage 9.3 Xcode 9.3 Performance and accuracy Target selection xccov Source editor
10 Performance and Accuracy
11 Time to Load In seconds Xcode 9.3 Xcode
12 Time to Load In seconds Xcode 9.3 Xcode
13 Time to Load In seconds Xcode 9.3 Xcode
14 Time to Load In seconds Xcode 9.3 Xcode
15 Time to Load In seconds Xcode Xcode
16 File Size In MB Xcode 9.3 Xcode
17 File Size In MB Xcode 9.3 Xcode
18 File Size In MB Xcode 9.3 Xcode
19 File Size In MB Xcode Xcode
20 Xcode 9 C++ header 9.0
21 Xcode 9.3 C++ header 9.3
22 Target Selection
23 Target Selection Code Coverage Enabled for all targets Enabled for selected targets Disabled
24 Does time in window need to match top bar?
25
26
27 xccov
28 xccov Command line tool Output formats Human-readable Machine-parseable (JSON) View coverage data
29 Coverage Data
30 Coverage Data xccovreport Coverage report Line coverage percentages
31 Coverage Data xccovreport xccovarchive Coverage report Coverage archive Line coverage percentages Raw execution counts
32 Coverage Data
33 Coverage Data Derived data
34 Coverage Data Derived data Result bundle xcodebuild -resultbundlepath
35 xcrun xccov view HelloWorld.xccovreport Name Coverage HelloWorld.app 57.89% (11/19) /tmp/helloworld/helloworld/appdelegate.m 50.00% (3/6) -[AppDelegate applicationwillterminate:] 0.00% (0/3) -[AppDelegate applicationdidfinishlaunching:] % (3/3) /tmp/helloworld/helloworld/viewcontroller.m 50.00% (5/10) -[ViewController setrepresentedobject:] 0.00% (0/5) -[ViewController viewdidload] % (5/5) /tmp/helloworld/helloworld/main.m % (3/3) main % (3/3) HelloWorldTests.xctest % (21/21) /tmp/helloworld/helloworldtests/helloworldtests.m % (21/21) -[HelloWorldTests testexample] % (4/4)
36 xcrun xccov view HelloWorld.xccovreport Name Coverage HelloWorld.app 57.89% (11/19) /tmp/helloworld/helloworld/appdelegate.m 50.00% (3/6) -[AppDelegate applicationwillterminate:] 0.00% (0/3) -[AppDelegate applicationdidfinishlaunching:] % (3/3) /tmp/helloworld/helloworld/viewcontroller.m 50.00% (5/10) -[ViewController setrepresentedobject:] 0.00% (0/5) -[ViewController viewdidload] % (5/5) /tmp/helloworld/helloworld/main.m % (3/3) main % (3/3) HelloWorldTests.xctest % (21/21) /tmp/helloworld/helloworldtests/helloworldtests.m % (21/21) -[HelloWorldTests testexample] % (4/4)
37 xcrun xccov view HelloWorld.xccovreport Name Coverage HelloWorld.app 57.89% (11/19) /tmp/helloworld/helloworld/appdelegate.m 50.00% (3/6) -[AppDelegate applicationwillterminate:] 0.00% (0/3) -[AppDelegate applicationdidfinishlaunching:] % (3/3) /tmp/helloworld/helloworld/viewcontroller.m 50.00% (5/10) -[ViewController setrepresentedobject:] 0.00% (0/5) -[ViewController viewdidload] % (5/5) /tmp/helloworld/helloworld/main.m % (3/3) main % (3/3) HelloWorldTests.xctest % (21/21) /tmp/helloworld/helloworldtests/helloworldtests.m % (21/21) -[HelloWorldTests testexample] % (4/4)
38 xcrun xccov view HelloWorld.xccovreport Name Coverage HelloWorld.app 57.89% (11/19) /tmp/helloworld/helloworld/appdelegate.m 50.00% (3/6) -[AppDelegate applicationwillterminate:] 0.00% (0/3) -[AppDelegate applicationdidfinishlaunching:] % (3/3) /tmp/helloworld/helloworld/viewcontroller.m 50.00% (5/10) -[ViewController setrepresentedobject:] 0.00% (0/5) -[ViewController viewdidload] % (5/5) /tmp/helloworld/helloworld/main.m % (3/3) main % (3/3) HelloWorldTests.xctest % (21/21) /tmp/helloworld/helloworldtests/helloworldtests.m % (21/21) -[HelloWorldTests testexample] % (4/4)
39 xcrun xccov view --json HelloWorld.xccovreport { "coveredlines": 32, "linecoverage": 0.8, "targets": [ { "coveredlines": 11, "linecoverage": , "files": [ { "coveredlines": 3, "linecoverage": 0.5, "path": "tmphelloworldhelloworldappdelegate.m", "functions": [ { "coveredlines": 0,
40 xcrun xccov view --json HelloWorld.xccovreport { "coveredlines": 32, "linecoverage": 0.8, "targets": [ { "coveredlines": 11, "linecoverage": , "files": [ { "coveredlines": 3, "linecoverage": 0.5, "path": "tmphelloworldhelloworldappdelegate.m", "functions": [ { "coveredlines": 0,
41 xcrun xccov view --json HelloWorld.xccovreport { "coveredlines": 32, "linecoverage": 0.8, "targets": [ { "coveredlines": 11, "linecoverage": , "files": [ { "coveredlines": 3, "linecoverage": 0.5, "path": "tmphelloworldhelloworldappdelegate.m", "functions": [ { "coveredlines": 0,
42 man xccov NAME xccov - view Xcode coverage data in human-readable or machine-parseable format. SYNOPSIS xccov view [--only-targets --files-for-target target_name --functions-for-file name_or_path] [--json] report.xccovreport xccov view [--file-list --file path] archive.xccovarchive DESCRIPTION When tests are run with code coverage enabled, Xcode generates two files that contain its representation of coverage data. These are the coverage report, with extension xccovreport, and the coverage archive, with extension xccovarchive. The coverage report contains line coverage percentages for each target, source file, and function/method that has coverage information. The coverage archive contains the raw
43 Source Editor
44
45
46
47
48 Demo
49 Code coverage Test selection and ordering Parallel testing
50 Code coverage Test selection and ordering Parallel testing
51 Test Selection Not all tests are equal 1,000 unit tests 10 UI tests Different tests in different situations Pre-commit Nightly
52 Test Selection with Schemes
53 Test Selection with Schemes Tests to skip Automatically includes new tests
54 Test Selection with Schemes NEW Tests to skip Automatically includes new tests Tests to run Explicit opt-in for tests
55 Does time in window need to match top bar?
56
57
58 Test Ordering
59 Test Ordering Alphabetical Default Deterministic Can hide implicit dependencies
60 Implicit Dependencies Between Tests
61 Implicit Dependencies Between Tests test A test B test C
62 Implicit Dependencies Between Tests test A test B test C
63 Implicit Dependencies Between Tests test A test B test C
64 Implicit Dependencies Between Tests test A test B test C
65 Implicit Dependencies Between Tests test A test B test C
66 Implicit Dependencies Between Tests test B test A test C
67 Implicit Dependencies Between Tests test B test A test C
68 Test Ordering Alphabetical Default Deterministic Can hide implicit dependencies
69 Test Ordering NEW Alphabetical Default Deterministic Can hide implicit dependencies Randomized Nondeterministic Can uncover implicit dependencies
70
71
72
73 Code coverage Test selection and ordering Parallel testing
74 Code coverage Test selection and ordering Parallel testing
75 Parallel Testing Ethan Vaughan, Xcode Engineer
76 Development Cycle Write Debug Test Push
77 Waiting for Tests to Finish =
78 Waiting for Tests to Finish =
79 Parallel Destination Testing 9.0 Ability to run all of your tests on multiple destinations simultaneously xcodebuild test -destination platform=ios,name=iphone X -destination platform=ios,name=ipad
80 Parallel Destination Testing 8.0 iphone X ipad Time
81 Parallel Destination Testing 9.0 iphone X ipad Time
82 Parallel Destination Testing Limitations
83 Parallel Destination Testing Limitations Only beneficial if testing on multiple destinations
84 Parallel Destination Testing Limitations Only beneficial if testing on multiple destinations Only available from xcodebuild
85 Parallel Distributed Testing NEW
86 Parallel Distributed Testing NEW Execute tests in parallel on a single destination Time
87 Parallel Distributed Testing NEW Execute tests in parallel on a single destination Time
88 Testing Architecture
89 Testing Architecture Unit tests func testfoo() {... }
90 Testing Architecture Unit tests func testfoo() {... }
91 Testing Architecture Unit tests func testfoo() {... } Test Bundle
92 Testing Architecture Unit tests func testfoo() {... } Test Bundle
93 Testing Architecture Unit tests Your App Test Bundle
94 Testing Architecture Unit tests
95 Testing Architecture UI tests UI Test Runner
96 Testing Architecture UI tests UI Test Runner
97 Testing Architecture UI tests UI Test Runner Your App
98 Testing Architecture UI tests UI Test Runner Your App
99 Testing Architecture UI tests Click UI Test Runner Your App
100 Testing Architecture UI tests Click UI Test Runner Your App Advanced Testing and Continuous Integration WWDC 2016
101 Overview Parallel Distributed Testing Xcode
102 Overview Parallel Distributed Testing Xcode
103 Overview Parallel Distributed Testing Xcode Runner
104 Overview Parallel Distributed Testing Xcode
105 Overview Parallel Distributed Testing Xcode
106 Overview Parallel Distributed Testing t3 t2 t1 Xcode
107 Overview Parallel Distributed Testing t1 t2 Xcode t3
108 Classes Execute in Parallel R1 R2 R3 Time
109 Classes Execute in Parallel R1 C C C R2 C C C R3 C C C Time
110 Classes Execute in Parallel Motivation
111 Classes Execute in Parallel Motivation Hidden dependencies between tests in a class
112 Classes Execute in Parallel Motivation Hidden dependencies between tests in a class Avoid unnecessary +setup and +teardown computation
113 Parallel Testing on Simulator Original Simulator
114 Parallel Testing on Simulator Original Simulator
115 Parallel Testing on Simulator Original Simulator Clone 1 Clone 2 Clone 3
116 Parallel Testing on Simulator Original Simulator Clone 1 Clone 2 Clone 3
117 Parallel Testing on Simulator Original Simulator C C C
118 Parallel Testing on Simulator Implications
119 Parallel Testing on Simulator Implications Original simulator is not used during testing
120 Parallel Testing on Simulator Implications Original simulator is not used during testing Separate data containers
121 Supported Configurations Unit Tests UI Tests macos Simulator (ios and tvos)
122 Demo
123 Demo Recap
124 Demo Recap Enabling parallelization
125 Demo Recap Enabling parallelization Viewing results in the test log and test report
126 Demo Recap Enabling parallelization Viewing results in the test log and test report Multiple instances of a Mac app running unit tests
127 Demo Recap Enabling parallelization Viewing results in the test log and test report Multiple instances of a Mac app running unit tests Multiple simulator clones running UI tests
128 xcodebuild
129 xcodebuild Override the number of workers -parallel-testing-worker-count n
130 xcodebuild Override the number of workers -parallel-testing-worker-count n Force parallel testing on or off -parallel-testing-enabled YES NO
131 Tips and Tricks
132 Tips and Tricks Consider splitting a long running class into two classes
133 Classes Execute in Parallel R1 C C R2 C C R3 C C Time
134 Classes Execute in Parallel R1 C R2 C C C R3 C C Time
135 Tips and Tricks Consider splitting a long running class into two classes
136 Tips and Tricks Consider splitting a long running class into two classes Put performance tests into their own bundle, with parallelization disabled
137 Tips and Tricks Consider splitting a long running class into two classes Put performance tests into their own bundle, with parallelization disabled Understand which tests are not safe for parallelization
138 Tips and Tricks Consider splitting a long running class into two classes Put performance tests into their own bundle, with parallelization disabled Understand which tests are not safe for parallelization Testing Tips & Tricks Hall 2 Friday 3:20PM
139 Summary
140 Summary Code coverage
141 Summary Code coverage Test selection and ordering
142 Summary Code coverage Test selection and ordering Parallel testing
143 More Information Simulator, Testing, and Continuous Integration Lab Technology Lab 8 Wednesday 12:00PM Simulator, Testing, and Continuous Integration Lab Technology Lab 8 Friday 9:00AM
144
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