Go Gherkin Makefile
Clone or download
l3pp4rd Merge pull request #123 from Pykselle/Pykselle-patch-1
Fix windows /dev/null bug with go1.10.0
Latest commit 9436350 Mar 30, 2018
Permalink
Failed to load latest commit information.
cmd/godog Fixed: assigned os.Stdin to cmd.Stdin when launching godog Jan 5, 2017
colors refactor colorization into the separate package Oct 30, 2016
examples add support for binding godog flags to specified *flag.FlagSet Mar 13, 2018
features do not fire events when feature or scenario is empty Oct 26, 2017
gherkin ship gherkin parser in a subpackage to prevent compatibility conflicts May 27, 2016
screenshots update godog usage example with more details Jun 17, 2016
.gitignore add an ls feature example Jun 23, 2015
.travis.yml adapt to new compiler and linker in go tool chain Mar 3, 2018
CHANGELOG.md bump version and update changelog Mar 4, 2018
LICENSE bump version and update changelog Mar 4, 2018
Makefile updates documentation in README Apr 30, 2017
README.md update formatting in readme Mar 13, 2018
ast.go cleanup and fix locating for godog dependency Jun 14, 2016
ast_test.go cleanup and fix locating for godog dependency Jun 14, 2016
builder.go adapt to new compiler and linker in go tool chain Mar 3, 2018
builder_go110.go Fix windows bug Mar 30, 2018
builder_test.go vendor package support missing still for go1.10 Mar 3, 2018
flags.go add support for binding godog flags to specified *flag.FlagSet Mar 13, 2018
flags_test.go tests flags and binary builder Apr 27, 2017
fmt.go common failed scenario output for progress and pretty format: #113 Mar 4, 2018
fmt_cucumber.go handles undefined step templates for nested steps Apr 29, 2017
fmt_events.go handles undefined step templates for nested steps Apr 29, 2017
fmt_junit.go handles undefined step templates for nested steps Apr 29, 2017
fmt_junit_test.go tests progress formatter output production Apr 28, 2017
fmt_pretty.go common failed scenario output for progress and pretty format: #113 Mar 4, 2018
fmt_progress.go common failed scenario output for progress and pretty format: #113 Mar 4, 2018
fmt_progress_test.go common failed scenario output for progress and pretty format: #113 Mar 4, 2018
fmt_test.go move SuiteContext out of `_test` namespace May 5, 2017
gherkin.go do not fire events when feature or scenario is empty Oct 26, 2017
godog.go add support for binding godog flags to specified *flag.FlagSet Mar 13, 2018
logo.png minify logo Jul 10, 2015
options.go adds --strict flag to fail suite when there are pending or undefined … May 4, 2017
run.go closes #96 Aug 31, 2017
run_test.go closes #96 Aug 31, 2017
stacktrace.go fixes stack trace test Apr 28, 2017
stacktrace_test.go fixes stack trace test Apr 28, 2017
stepdef.go closes #96 Aug 31, 2017
stepdef_test.go improves stepdef test coverage Apr 28, 2017
suite.go do not fire events when feature or scenario is empty Oct 26, 2017
suite_context.go closes #97 Aug 31, 2017
suite_test.go compatibility with godog cli May 5, 2017
tag_filter_test.go test runnable source builder Jul 7, 2015
utils.go gets rid of fatal func, which exits application on unexpected error May 4, 2017
utils_test.go tests junit formatter Apr 28, 2017

README.md

Build Status GoDoc codecov.io

Godog

Godog logo

The API is likely to change a few times before we reach 1.0.0

Please read all the README, you may find it very useful. And do not forget to peek into the CHANGELOG from time to time.

Package godog is the official Cucumber BDD framework for Golang, it merges specification and test documentation into one cohesive whole. The author is a member of cucumber team.

The project is inspired by behat and cucumber and is based on cucumber gherkin3 parser.

Godog does not intervene with the standard go test command behavior. You can leverage both frameworks to functionally test your application while maintaining all test related source code in _test.go files.

Godog acts similar compared to go test command, by using go compiler and linker tool in order to produce test executable. Godog contexts need to be exported the same way as Test functions for go tests. Note, that if you use godog command tool, it will use go executable to determine compiler and linker.

Godog ships gherkin parser dependency as a subpackage. This will ensure that it is always compatible with the installed version of godog. So in general there are no vendor dependencies needed for installation.

The following about section was taken from cucumber homepage.

About

A single source of truth

Cucumber merges specification and test documentation into one cohesive whole.

Living documentation

Because they're automatically tested by Cucumber, your specifications are always bang up-to-date.

Focus on the customer

Business and IT don't always understand each other. Cucumber's executable specifications encourage closer collaboration, helping teams keep the business goal in mind at all times.

Less rework

When automated testing is this much fun, teams can easily protect themselves from costly regressions.

Install

go get github.com/DATA-DOG/godog/cmd/godog

Example

The following example can be found here.

Step 1

Given we create a new go package $GOPATH/src/godogs. From now on, this is our work directory cd $GOPATH/src/godogs.

Imagine we have a godog cart to serve godogs for lunch. First of all, we describe our feature in plain text - vim $GOPATH/src/godogs/features/godogs.feature:

# file: $GOPATH/src/godogs/features/godogs.feature
Feature: eat godogs
  In order to be happy
  As a hungry gopher
  I need to be able to eat godogs

  Scenario: Eat 5 out of 12
    Given there are 12 godogs
    When I eat 5
    Then there should be 7 remaining

NOTE: same as go test godog respects package level isolation. All your step definitions should be in your tested package root directory. In this case - $GOPATH/src/godogs

Step 2

If godog is installed in your GOPATH. We can run godog inside the $GOPATH/src/godogs directory. You should see that the steps are undefined:

Undefined step snippets

If we wish to vendor godog dependency, we can do it as usual, using tools you prefer:

git clone https://github.com/DATA-DOG/godog.git $GOPATH/src/godogs/vendor/github.com/DATA-DOG/godog

It gives you undefined step snippets to implement in your test context. You may copy these snippets into your godogs_test.go file.

Our directory structure should now look like:

Directory layout

If you copy the snippets into our test file and run godog again. We should see the step definition is now pending:

Pending step definition

You may change ErrPending to nil and the scenario will pass successfully.

Since we need a working implementation, we may start by implementing only what is necessary.

Step 3

We only need a number of godogs for now. Lets keep it simple.

/* file: $GOPATH/src/godogs/godogs.go */
package main

// Godogs available to eat
var Godogs int

func main() { /* usual main func */ }

Step 4

Now lets implement our step definitions, which we can copy from generated console output snippets in order to test our feature requirements:

/* file: $GOPATH/src/godogs/godogs_test.go */
package main

import (
	"fmt"

	"github.com/DATA-DOG/godog"
)

func thereAreGodogs(available int) error {
	Godogs = available
	return nil
}

func iEat(num int) error {
	if Godogs < num {
		return fmt.Errorf("you cannot eat %d godogs, there are %d available", num, Godogs)
	}
	Godogs -= num
	return nil
}

func thereShouldBeRemaining(remaining int) error {
	if Godogs != remaining {
		return fmt.Errorf("expected %d godogs to be remaining, but there is %d", remaining, Godogs)
	}
	return nil
}

func FeatureContext(s *godog.Suite) {
	s.Step(`^there are (\d+) godogs$`, thereAreGodogs)
	s.Step(`^I eat (\d+)$`, iEat)
	s.Step(`^there should be (\d+) remaining$`, thereShouldBeRemaining)

	s.BeforeScenario(func(interface{}) {
		Godogs = 0 // clean the state before every scenario
	})
}

Now when you run the godog again, you should see:

Passed suite

We have hooked to BeforeScenario event in order to reset application state before each scenario. You may hook into more events, like AfterStep to print all state in case of an error. Or BeforeSuite to prepare a database.

By now, you should have figured out, how to use godog. Another advice is to make steps orthogonal, small and simple to read for an user. Whether the user is a dumb website user or an API developer, who may understand a little more technical context - it should target that user.

When steps are orthogonal and small, you can combine them just like you do with Unix tools. Look how to simplify or remove ones, which can be composed.

References and Tutorials

Documentation

See godoc for general API details. See .travis.yml for supported go versions. See godog -h for general command options.

See implementation examples:

FAQ

Running Godog with go test

You may integrate running godog in your go test command. You can run it using go TestMain func available since go 1.4. In this case it is not necessary to have godog command installed. See the following examples.

The following example binds godog flags with specified prefix godog in order to prevent flag collisions.

var opt = godog.Options{Output: colors.Colored(os.Stdout)}

func init() {
	godog.BindFlags("godog.", flag.CommandLine, &opt)
}

func TestMain(m *testing.M) {
	flag.Parse()
	opt.Paths = flag.Args()

	status := godog.RunWithOptions("godogs", func(s *godog.Suite) {
		FeatureContext(s)
	}, opt)

	if st := m.Run(); st > status {
		status = st
	}
	os.Exit(status)
}

Then you may run tests with by specifying flags in order to filter features.

go test -v --godog.format=progress --godog.random --godog.tags=wip
go test -v --godog.format=pretty --godog.random -race -coverprofile=coverage.txt -covermode=atomic

The following example does not bind godog flags, instead manually configuring needed options.

func TestMain(m *testing.M) {
	status := godog.RunWithOptions("godog", func(s *godog.Suite) {
		FeatureContext(s)
	}, godog.Options{
		Format:    "progress",
		Paths:     []string{"features"},
		Randomize: time.Now().UTC().UnixNano(), // randomize scenario execution order
	})

	if st := m.Run(); st > status {
		status = st
	}
	os.Exit(status)
}

You can even go one step further and reuse go test flags, like verbose mode in order to switch godog format. See the following example:

func TestMain(m *testing.M) {
	format := "progress"
	for _, arg := range os.Args[1:] {
		if arg == "-test.v=true" { // go test transforms -v option
			format = "pretty"
			break
		}
	}
	status := godog.RunWithOptions("godog", func(s *godog.Suite) {
		godog.SuiteContext(s)
	}, godog.Options{
		Format: format,
		Paths:     []string{"features"},
	})

	if st := m.Run(); st > status {
		status = st
	}
	os.Exit(status)
}

Now when running go test -v it will use pretty format.

Configure common options for godog CLI

There are no global options or configuration files. Alias your common or project based commands: alias godog-wip="godog --format=progress --tags=@wip"

Testing browser interactions

godog does not come with builtin packages to connect to the browser. You may want to look at selenium and probably phantomjs. See also the following components:

  1. browsersteps - provides basic context steps to start selenium and navigate browser content.
  2. You may wish to have goquery in order to work with HTML responses like with JQuery.

Concurrency

In order to support concurrency well, you should reset the state and isolate each scenario. They should not share any state. It is suggested to run the suite concurrently in order to make sure there is no state corruption or race conditions in the application.

It is also useful to randomize the order of scenario execution, which you can now do with --random command option.

NOTE: if suite runs with concurrency option, it concurrently runs every feature, not scenario per different features. This gives a flexibility to isolate state per feature. For example using BeforeFeature hook, it is possible to spin up costly service and shut it down only in AfterFeature hook and share the service between all scenarios in that feature. It is not advisable though, because you are risking having a state dependency.

Contributions

Feel free to open a pull request. Note, if you wish to contribute an extension to public (exported methods or types) - please open an issue before to discuss whether these changes can be accepted. All backward incompatible changes are and will be treated cautiously.

License

Godog is licensed under the three clause BSD license

Gherkin is licensed under the MIT and developed as a part of the cucumber project