├── .github └── dependabot.yml ├── .gitignore ├── .travis.yml ├── CHANGELOG.md ├── LICENSE ├── Makefile ├── PULL_REQUEST_TEMPLATE.md ├── README.md ├── examples └── simple │ └── main.go ├── go.mod ├── go.sum ├── jumper.go ├── jumper_bm_test.go ├── jumper_race_test.go ├── jumper_test.go └── reports └── .keep /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | version: 2 2 | updates: 3 | - package-ecosystem: gomod 4 | directory: "/" 5 | schedule: 6 | interval: daily 7 | time: "13:00" 8 | open-pull-requests-limit: 10 9 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, build with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | /reports/ -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: go 2 | 3 | go: 4 | - 1.13.x 5 | 6 | before_script: 7 | - make install 8 | 9 | script: 10 | - make build 11 | - make test 12 | -------------------------------------------------------------------------------- /CHANGELOG.md: -------------------------------------------------------------------------------- 1 | # Changelog 2 | 3 | All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines. 4 | 5 | ### [0.1.2](https://github.com/ghostsquad/go-timejumper/compare/v0.1.1...v0.1.2) (2020-01-29) 6 | 7 | 8 | ### Features 9 | 10 | * add travis.yaml ([34df6ef](https://github.com/ghostsquad/go-timejumper/commit/34df6ef29b79a6dab6fea9fee3764d7d6fdc4d8b)) 11 | 12 | 13 | ### Bug Fixes 14 | 15 | * phony the make targets ([1738eeb](https://github.com/ghostsquad/go-timejumper/commit/1738eeb477dbe4e181a2af8c66ab52453964559f)) 16 | * remove all racy tests ([0083639](https://github.com/ghostsquad/go-timejumper/commit/00836392c4fb35689ef97a84035fa4f2f6e96033)) 17 | * sleep for the scaled duration ([a5cddd2](https://github.com/ghostsquad/go-timejumper/commit/a5cddd23671a107229d62ec1abe70d7df99d8e1f)) 18 | * tests expected/actual were swapped ([2ae3703](https://github.com/ghostsquad/go-timejumper/commit/2ae3703af579b89d43948ebd95718bfb2e0f8c3d)) 19 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | # Help 2 | # This will parse the Makefile and generate help commands 3 | .PHONY: help 4 | help: ## Show Makefile help 5 | @awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST) 6 | 7 | .DEFAULT_GOAL := help 8 | 9 | .PHONY: install 10 | install: 11 | go get gotest.tools/gotestsum 12 | go get github.com/stretchr/testify/assert 13 | 14 | .PHONY: build 15 | build: 16 | go build 17 | 18 | .PHONY: test 19 | test: 20 | gotestsum --format short-verbose 21 | 22 | .PHONY: test-race 23 | test-race: 24 | gotestsum --format short-verbose -- -race 25 | 26 | .PHONY: test-bench 27 | test-bench: 28 | gotestsum --format short-verbose -- -bench=. -run=^$$ 29 | 30 | .PHONY: test-ci 31 | test-ci: 32 | gotestsum --junitfile reports/unit-tests.xml -- -bench=. -run=^$$ 33 | 34 | .PHONY: test-ci-bench 35 | test-ci-bench: 36 | go test -run=^$$ -bench=. ./... | tee reports/bench.txt 37 | 38 | .PHONY: test-ci-race 39 | test-ci-race: 40 | gotestsum --junitfile reports/race-tests.xml -- -race 41 | -------------------------------------------------------------------------------- /PULL_REQUEST_TEMPLATE.md: -------------------------------------------------------------------------------- 1 | # PR Description 2 | 3 | _What does this fix or add?_ 4 | 5 | # Checklist 6 | 7 | * [ ] Tests added 8 | * [ ] Good Path 9 | * [ ] Error Path 10 | * [ ] Commits follow conventions described here: 11 | * [ ] [https://conventionalcommits.org/en/v1.0.0-beta.4/#summary](https://conventionalcommits.org/en/v1.0.0-beta.4/#summary) 12 | * [ ] [https://chris.beams.io/posts/git-commit/#seven-rules](https://chris.beams.io/posts/git-commit/#seven-rules) 13 | * [ ] Commits are squashed such that 14 | * [ ] There is 1 commit per isolated change 15 | * [ ] I've not made extraneous commits/changes that are unrelated to my change. 16 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # TimeJumper 2 | 3 | [![Documentation](https://godoc.org/github.com/ghostsquad/go-timejumper?status.svg)](http://godoc.org/github.com/ghostsquad/go-timejumper) [![Go Report Card](https://goreportcard.com/badge/github.com/ghostsquad/go-timejumper)](https://goreportcard.com/report/github.com/ghostsquad/go-timejumper) [![Build Status](https://travis-ci.org/ghostsquad/go-timejumper.svg?branch=master)](https://travis-ci.org/ghostsquad/go-timejumper) 4 | 5 | Time as a dependency, very useful for testing. Unlike other similar libraries that use package globals, this gives you `Clock` interface that you can use in structs and functions as a dependency. `RealClock{}` delegates to the `time` standard library package. 6 | 7 | ## Quick Start 8 | 9 | ```go 10 | package main 11 | 12 | import ( 13 | "time" 14 | timejumper "github.com/ghostsquad/go-timejumper" 15 | ) 16 | 17 | clock := timejumper.New() 18 | t := clock.Now() 19 | fmt.Printf("current: %v\n", t) 20 | 21 | fmt.Println("Dive into the future!") 22 | clock.Jump(t.AddDate(1, 0, 0)) 23 | fmt.Printf("future: %v\n", clock.Now()) 24 | 25 | fmt.Println("Sleep, but not really") 26 | clock.Sleep(10 * time.Hour) 27 | fmt.Printf("future: %v\n", clock.Now()) 28 | 29 | fmt.Println("Back to the present") 30 | clock.Back() 31 | fmt.Printf("current: %v\n", clock.Now()) 32 | 33 | fmt.Println("Back to the past") 34 | clock.Freeze(t) 35 | fmt.Printf("frozen current: %v\n", clock.Now()) 36 | time.Sleep(5 * time.Seconds) 37 | fmt.Printf("frozen current: %v\n", clock.Now()) 38 | ``` 39 | 40 | ## Development 41 | 42 | ### Testing 43 | 44 | ```bash 45 | make install 46 | make test 47 | make test-bench 48 | make test-race 49 | ``` 50 | 51 | ### CI Testing 52 | 53 | ```bash 54 | make test-ci 55 | make test-ci-bench 56 | make test-ci-race 57 | ``` 58 | 59 | Output files are contained in [reports/](reports/) 60 | 61 | ## Contribution 62 | 63 | Thank you for your PR's! ❤️ 64 | 65 | Contribution, in any kind of way, is highly welcome! 66 | It doesn't matter if you are not able to write code. 67 | Creating issues or holding talks and help other people to use [go-timejumper](https://github.com/ghostsquad/go-timejumper) is contribution, too! 68 | A few examples: 69 | 70 | * Correct typos in the README / documentation 71 | * Reporting bugs 72 | * Implement a new feature or endpoint 73 | * Sharing the love of [go-timejumper](https://github.com/ghostsquad/go-timejumper) and help people to get use to it 74 | 75 | If you are new to pull requests, checkout [Collaborating on projects using issues and pull requests / Creating a pull request](https://help.github.com/articles/creating-a-pull-request/) as well as our [pull request template](PULL_REQUEST_TEMPLATE.md) 76 | 77 | ## Releasing 78 | 79 | Install [standard-version](https://github.com/conventional-changelog/standard-version) 80 | ```bash 81 | npm i -g standard-version 82 | ``` 83 | 84 | ```bash 85 | standard-version 86 | git push --tags 87 | ``` 88 | 89 | Manually copy/paste text from changelog (for this new version) into the release on Github.com. E.g. 90 | 91 | [https://github.com/ghostsquad/go-timejumper/releases/edit/v0.1.1](https://github.com/ghostsquad/go-timejumper/releases/edit/v0.1.1) 92 | -------------------------------------------------------------------------------- /examples/simple/main.go: -------------------------------------------------------------------------------- 1 | // +build ignore 2 | 3 | package main 4 | 5 | import ( 6 | "fmt" 7 | "time" 8 | 9 | timejumper "github.com/ghostsquad/go-timejumper" 10 | ) 11 | 12 | func main() { 13 | clock := timejumper.New() 14 | t := clock.Now() 15 | 16 | fmt.Printf("current: %v\n", t) 17 | 18 | fmt.Println("") 19 | 20 | fmt.Println("Dive into the future!") 21 | clock.Jump(t.AddDate(0, 0, 11)) 22 | fmt.Printf("future: %v\n", clock.Now()) 23 | 24 | fmt.Println("") 25 | 26 | fmt.Println("Sleep, but not really") 27 | clock.Sleep(10 * time.Second) 28 | fmt.Printf("future: %v\n", clock.Now()) 29 | 30 | fmt.Println("") 31 | 32 | fmt.Println("Back to the present") 33 | clock.Back() 34 | fmt.Printf("current: %v\n", clock.Now()) 35 | 36 | fmt.Println("") 37 | 38 | fmt.Println("Freeze the present") 39 | clock.Freeze(t) 40 | fmt.Printf("frozen current: %v\n", clock.Now()) 41 | fmt.Println("Doing an actual 2 sec sleep for demonstration...") 42 | time.Sleep(2 * time.Second) 43 | fmt.Printf("frozen current: %v\n", clock.Now()) 44 | } 45 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/ghostsquad/go-timejumper 2 | 3 | go 1.13 4 | 5 | require github.com/stretchr/testify v1.8.4 6 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 2 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 3 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 4 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= 5 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 6 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 7 | github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw= 8 | github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo= 9 | github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= 10 | github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU= 11 | github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk= 12 | github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo= 13 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= 14 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 15 | gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 16 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= 17 | gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 18 | -------------------------------------------------------------------------------- /jumper.go: -------------------------------------------------------------------------------- 1 | package timejumper 2 | 3 | // https://stackoverflow.com/questions/18970265/is-there-an-easy-way-to-stub-out-time-now-globally-in-golang-during-test 4 | 5 | import ( 6 | "errors" 7 | "sync" 8 | "time" 9 | ) 10 | 11 | // Clock is an interface that allows you to a create 12 | // different implementions for testing purposes 13 | type Clock interface { 14 | Now() time.Time 15 | Since(time.Time) time.Duration 16 | Sleep(time.Duration) 17 | } 18 | 19 | // RealClock implements the standard lib 20 | // only functions relevant for this codebase 21 | type RealClock struct{} 22 | 23 | // Now is a proxy to time.Now 24 | func (RealClock) Now() time.Time { 25 | return time.Now() 26 | } 27 | 28 | // Since is a proxy to time.Since 29 | func (RealClock) Since(t time.Time) time.Duration { 30 | return time.Since(t) 31 | } 32 | 33 | // Sleep is a proxy to time.Sleep 34 | func (RealClock) Sleep(d time.Duration) { 35 | time.Sleep(d) 36 | } 37 | 38 | // compile-time assertion that RealClock matches Clock interface 39 | var _ Clock = RealClock{} 40 | 41 | // TimeMachine is a function that gets called each time Now() is called 42 | // The default machine allows the usage of freeze, scale and jump features of 43 | // Jumper. This allows you to completely switch out the functionality 44 | type TimeMachine func() (newTime time.Time) 45 | 46 | // JumperClock is a Go implementation of but does not use package globals 47 | // https://github.com/travisjeffery/timecop 48 | // Instantiate with New() 49 | type JumperClock struct { 50 | isFrozen bool 51 | initialTime time.Time 52 | initialTimeSetAt time.Time 53 | scale int 54 | activate TimeMachine 55 | mutex sync.Mutex 56 | } 57 | 58 | // New returns a new instance of a TimeCopClock 59 | func New() *JumperClock { 60 | c := &JumperClock{ 61 | scale: 1, 62 | } 63 | 64 | c.Back() 65 | c.activate = c.NewDefaultTimeMachine() 66 | 67 | return c 68 | } 69 | 70 | // Now activates the TimeMachine 71 | func (c *JumperClock) Now() time.Time { 72 | c.mutex.Lock() 73 | defer c.mutex.Unlock() 74 | 75 | return c.activate() 76 | } 77 | 78 | // Since returns the time elapsed since t. It is shorthand for .Now().Sub(t). 79 | func (c *JumperClock) Since(t time.Time) time.Duration { 80 | c.mutex.Lock() 81 | defer c.mutex.Unlock() 82 | 83 | return c.activate().Sub(t) 84 | } 85 | 86 | // Sleep is similar to jump, except that it takes a duration 87 | func (c *JumperClock) Sleep(d time.Duration) { 88 | c.mutex.Lock() 89 | defer c.mutex.Unlock() 90 | 91 | now := c.activate() 92 | 93 | // Sleep for the scaled duration 94 | c.initialTime = now.Add(d * time.Duration(c.scale)) 95 | c.initialTimeSetAt = time.Now() 96 | } 97 | 98 | // compile-time assertion that RealClock matches Clock interface 99 | var _ Clock = &JumperClock{} 100 | 101 | // NewDefaultTimeMachine is what's used to enable scaling and freezing 102 | func (c *JumperClock) NewDefaultTimeMachine() TimeMachine { 103 | return func() time.Time { 104 | if c.isFrozen { 105 | return c.initialTime 106 | } 107 | 108 | diff := time.Now().Sub(c.initialTimeSetAt) 109 | return c.initialTime.Add(diff * time.Duration(c.scale)) 110 | } 111 | } 112 | 113 | // Freeze ensures time doesn't progress forward 114 | // You can still move time by freezing again with a new time 115 | // or by using Travel 116 | func (c *JumperClock) Freeze(t time.Time) { 117 | c.mutex.Lock() 118 | defer c.mutex.Unlock() 119 | 120 | c.isFrozen = true 121 | c.initialTime = t 122 | c.initialTimeSetAt = time.Now() 123 | } 124 | 125 | // Jump sets the clock to the desired time 126 | // Compatible with Freeze (will remain frozen if previously frozen) 127 | func (c *JumperClock) Jump(t time.Time) { 128 | c.mutex.Lock() 129 | defer c.mutex.Unlock() 130 | 131 | c.initialTime = t 132 | c.initialTimeSetAt = time.Now() 133 | } 134 | 135 | // Scale sets the time scale multiplier 136 | // If set to 0, freezes the clock instead 137 | func (c *JumperClock) Scale(s int) error { 138 | if s < 0 { 139 | return errors.New("Cannot set scale to less than 0") 140 | } 141 | 142 | if s == 0 { 143 | c.isFrozen = true 144 | return nil 145 | } 146 | 147 | c.scale = s 148 | return nil 149 | } 150 | 151 | // Back returns you to the present (future? since you started) 152 | // Does not change the TimeMachine 153 | func (c *JumperClock) Back() { 154 | c.mutex.Lock() 155 | defer c.mutex.Unlock() 156 | 157 | now := time.Now() 158 | 159 | c.isFrozen = false 160 | c.initialTime = now 161 | c.initialTimeSetAt = now 162 | } 163 | 164 | // SetTimeMachine sets TimeMachine, a function that controls how time works! 165 | // It also resets the clock according to Back() 166 | func (c *JumperClock) SetTimeMachine(t TimeMachine) { 167 | c.Back() 168 | c.activate = t 169 | } 170 | -------------------------------------------------------------------------------- /jumper_bm_test.go: -------------------------------------------------------------------------------- 1 | // +build !race 2 | 3 | package timejumper 4 | 5 | import ( 6 | "testing" 7 | "time" 8 | ) 9 | 10 | func BenchmarkTime_Now(b *testing.B) { 11 | for i := 0; i < b.N; i++ { 12 | time.Now() 13 | } 14 | } 15 | 16 | func BenchmarkRealClock_Now(b *testing.B) { 17 | c := RealClock{} 18 | 19 | for i := 0; i < b.N; i++ { 20 | c.Now() 21 | } 22 | } 23 | 24 | func BenchmarkJumperClock_Now(b *testing.B) { 25 | c := New() 26 | 27 | for i := 0; i < b.N; i++ { 28 | c.Now() 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /jumper_race_test.go: -------------------------------------------------------------------------------- 1 | package timejumper 2 | 3 | import ( 4 | "testing" 5 | "time" 6 | ) 7 | 8 | func TestJumperClock_Race(t *testing.T) { 9 | c := New() 10 | 11 | go func() { 12 | for { 13 | c.Freeze(time.Now()) 14 | c.Now() 15 | } 16 | }() 17 | 18 | go func() { 19 | for { 20 | c.Jump(time.Now()) 21 | c.Now() 22 | } 23 | }() 24 | 25 | go func() { 26 | for { 27 | c.Sleep(10 * time.Millisecond) 28 | c.Now() 29 | } 30 | }() 31 | 32 | go func() { 33 | for { 34 | c.Back() 35 | c.Now() 36 | } 37 | }() 38 | 39 | go func() { 40 | for { 41 | now := c.Now() 42 | c.Since(now) 43 | } 44 | }() 45 | 46 | time.Sleep(1 * time.Second) 47 | } 48 | -------------------------------------------------------------------------------- /jumper_test.go: -------------------------------------------------------------------------------- 1 | // +build !race 2 | 3 | package timejumper 4 | 5 | import ( 6 | "testing" 7 | "time" 8 | 9 | "github.com/stretchr/testify/assert" 10 | ) 11 | 12 | func TestJumperClock_Now(t *testing.T) { 13 | t.Parallel() 14 | sleepTime := 10 * time.Millisecond 15 | 16 | t.Run("frozen behavior", func(t *testing.T) { 17 | c := New() 18 | 19 | present := time.Now() 20 | c.Freeze(present) 21 | time.Sleep(sleepTime) 22 | future := c.Now() 23 | 24 | assert.Equal(t, present, future) 25 | }) 26 | 27 | t.Run("scaling behavior", func(t *testing.T) { 28 | c := New() 29 | 30 | present := time.Now() 31 | c.Freeze(present) 32 | scale := 2 33 | c.Scale(scale) 34 | c.Sleep(sleepTime) 35 | future := c.Now() 36 | 37 | expectedDiff := sleepTime * time.Duration(scale) 38 | 39 | assert.Equal(t, expectedDiff, future.Sub(present)) 40 | }) 41 | 42 | t.Run("jumping behavior", func(t *testing.T) { 43 | c := New() 44 | 45 | present := time.Now() 46 | c.Freeze(present) 47 | future := present.AddDate(1, 0, 0) 48 | c.Jump(future) 49 | 50 | assert.Equal(t, future, c.Now()) 51 | }) 52 | 53 | t.Run("sleeping behavior", func(t *testing.T) { 54 | c := New() 55 | present := time.Now() 56 | c.Freeze(present) 57 | c.Sleep(sleepTime) 58 | 59 | assert.Equal(t, present.Add(sleepTime), c.Now()) 60 | }) 61 | } 62 | -------------------------------------------------------------------------------- /reports/.keep: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ghostsquad/go-timejumper/a0884ccd2db34b2e7c0a957a87485ca11a79834d/reports/.keep --------------------------------------------------------------------------------