instead of Suite interface expose Suite struct

* 570d70a update examples regarding Suite interface removal, closes #11

README.md

@@ -25,11 +25,15 @@ not changed most likely. I'll try to respect **backward compatibility** as much
 
 ### Example
 
+The following example can be [found here](https://github.com/DATA-DOG/godog/tree/master/examples/godogs).
+
+#### Step 1
+
 Imagine we have a **godog cart** to serve godogs for dinner. At first, we describe our feature
 in plain text:
 
 ``` gherkin
-# file: /tmp/godog/godog.feature
+# file: examples/godogs/godog.feature
 Feature: eat godogs
   In order to be happy
   As a hungry gopher
@@ -44,22 +48,27 @@ Feature: eat godogs
 As a developer, your work is done as soon as you’ve made the program behave as
 described in the Scenario.
 
-If you run `godog godog.feature` inside the **/tmp/godog** directory.
+#### Step 2
+
+If you run `godog godog.feature` inside the **examples/godogs** directory.
 You should see that the steps are undefined:
 
 ![Screenshot](https://raw.github.com/DATA-DOG/godog/master/screenshots/undefined.png)
 
 It gives you undefined step snippets to implement in your test context. You may copy these snippets
-into **godog_test.go** file.
+into your `*_test.go` file.
 
 Now if you run the tests again. You should see that the definition is now pending. You may change
 **ErrPending** to **nil** and the scenario will pass successfully.
 
-Since we need a working implementation, we may start by implementing what is necessary.
-We only need a number of **godogs** for now.
+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 define steps.
 
 ``` go
-/* file: /tmp/godog/godog.go */
+/* file: examples/godogs/godog.go */
 package main
 
 var Godogs int
@@ -67,10 +76,12 @@ var Godogs int
 func main() { /* usual main func */ }
 ```
 
+#### Step 4
+
 Now lets finish our step implementations in order to test our feature requirements:
 
 ``` go
-/* file: /tmp/godog/godog_test.go */
+/* file: examples/godogs/godog_test.go */
 package main
 
 import (
@@ -99,7 +110,7 @@ func thereShouldBeRemaining(remaining int) error {
 	return nil
 }
 
-func featureContext(s godog.Suite) {
+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)
@@ -126,8 +137,15 @@ See `godog -h` for general command options.
 
 See implementation examples:
 
-- [rest API server](https://github.com/DATA-DOG/godog/tree/master/examples/api) implementation and tests
-- [ls command](https://github.com/DATA-DOG/godog/tree/master/examples/ls) implementation and tests
+- [rest API server](https://github.com/DATA-DOG/godog/tree/master/examples/api)
+- [godogs](https://github.com/DATA-DOG/godog/tree/master/examples/godogs)
+
+### Changes
+
+**2015-07-03**
+- changed **godog.Suite** from interface to struct. Context registration should be updated accordingly. The reason
+for change: since it exports the same methods and there is no need to mock a function in tests, there is no
+obvious reason to keep an interface.
 
 ### FAQ
 

builder.go

@@ -82,7 +82,7 @@ func (b *builder) parseFile(path string) error {
 		b.Internal = true
 	}
 	b.deleteMainFunc(f)
-	b.registerSteps(f)
+	b.registerContexts(f)
 	b.deleteImports(f)
 	b.files[path] = f
 
@@ -122,27 +122,30 @@ func (b *builder) deleteMainFunc(f *ast.File) {
 	f.Decls = decls
 }
 
-func (b *builder) registerSteps(f *ast.File) {
+func (b *builder) registerContexts(f *ast.File) {
 	for _, d := range f.Decls {
 		switch fun := d.(type) {
 		case *ast.FuncDecl:
 			for _, param := range fun.Type.Params.List {
 				switch expr := param.Type.(type) {
-				case *ast.SelectorExpr:
+				case *ast.StarExpr:
 					switch x := expr.X.(type) {
 					case *ast.Ident:
-						if x.Name == "godog" && expr.Sel.Name == "Suite" {
+						if x.Name == "Suite" {
 							b.Contexts = append(b.Contexts, fun.Name.Name)
 						}
-					}
+					case *ast.SelectorExpr:
+						switch t := x.X.(type) {
 						case *ast.Ident:
-					if expr.Name == "Suite" {
+							if t.Name == "godog" && x.Sel.Name == "Suite" {
 								b.Contexts = append(b.Contexts, fun.Name.Name)
 							}
 						}
 					}
 				}
 			}
+		}
+	}
 }
 
 func (b *builder) merge() (*ast.File, error) {

examples/api/README.md

@@ -75,7 +75,7 @@ func (a *apiFeature) theResponseShouldMatchJSON(body *gherkin.DocString) error {
 	return godog.ErrPending
 }
 
-func featureContext(s godog.Suite) {
+func featureContext(s *godog.Suite) {
 	api := &apiFeature{}
 	s.Step(`^I send "([^"]*)" request to "([^"]*)"$`, api.iSendrequestTo)
 	s.Step(`^the response code should be (\d+)$`, api.theResponseCodeShouldBe)
@@ -158,7 +158,7 @@ func (a *apiFeature) theResponseShouldMatchJSON(body *gherkin.DocString) (err er
 	return
 }
 
-func featureContext(s godog.Suite) {
+func featureContext(s *godog.Suite) {
 	api := &apiFeature{}
 
 	s.BeforeScenario(api.resetResponse)

examples/api/api_test.go

@@ -67,7 +67,7 @@ func (a *apiFeature) theResponseShouldMatchJSON(body *gherkin.DocString) (err er
 	return
 }
 
-func featureContext(s godog.Suite) {
+func featureContext(s *godog.Suite) {
 	api := &apiFeature{}
 
 	s.BeforeScenario(api.resetResponse)

examples/db/api_test.go

@@ -117,7 +117,7 @@ func (a *apiFeature) thereAreUsers(users *gherkin.DataTable) error {
 	return nil
 }
 
-func featureContext(s godog.Suite) {
+func featureContext(s *godog.Suite) {
 	api := &apiFeature{}
 
 	s.BeforeScenario(api.resetResponse)

examples/godogs/godog.feature

@@ -0,0 +1,9 @@
+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

examples/godogs/godog.go

@@ -0,0 +1,5 @@
+package main
+
+var Godogs int
+
+func main() { /* usual main func */ }

examples/godogs/godog_test.go

@@ -0,0 +1,37 @@
+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
+	})
+}

examples/ls/README.md

@@ -1,7 +0,0 @@
-# ls feature
-
-In order to test our **ls** feature with **Godog**, run:
-
-    go get github.com/DATA-DOG/godog/cmd/godog
-    $GOPATH/bin/godog ls.feature
-

examples/ls/ls.feature

@@ -1,27 +0,0 @@
-Feature: ls
-  In order to see the directory structure
-  As a UNIX user
-  I need to be able to list directory contents
-
-  Background:
-    Given I am in a directory "test"
-
-  Scenario: lists files in directory
-    Given I have a file named "foo"
-    And I have a file named "bar"
-    When I run ls
-    Then I should get output:
-      """
-      bar
-      foo
-      """
-
-  Scenario: lists files and directories
-    Given I have a file named "foo"
-    And I have a directory named "dir"
-    When I run ls
-    Then I should get output:
-      """
-      dir
-      foo
-      """

examples/ls/ls.go

@@ -1,35 +0,0 @@
-// Example - demonstrates ls command implementation tests.
-package main
-
-import (
-	"io"
-	"log"
-	"os"
-	"path/filepath"
-)
-
-func main() {
-	var location string
-	switch {
-	case os.Args[1] != "":
-		location = os.Args[1]
-	default:
-		location = "."
-	}
-	if err := ls(location, os.Stdout); err != nil {
-		log.Fatal(err)
-	}
-}
-
-func ls(path string, w io.Writer) error {
-	return filepath.Walk(path, func(p string, f os.FileInfo, err error) error {
-		switch {
-		case f.IsDir() && f.Name() != "." && f.Name() != ".." && filepath.Base(path) != f.Name():
-			w.Write([]byte(f.Name() + "\n"))
-			return filepath.SkipDir
-		case !f.IsDir():
-			w.Write([]byte(f.Name() + "\n"))
-		}
-		return err
-	})
-}

examples/ls/ls_test.go

@@ -1,66 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"strings"
-
-	"github.com/DATA-DOG/godog"
-	"github.com/cucumber/gherkin-go"
-)
-
-type lsFeature struct {
-	dir string
-	buf *bytes.Buffer
-}
-
-func lsFeatureContext(s godog.Suite) {
-	c := &lsFeature{buf: bytes.NewBuffer(make([]byte, 1024))}
-
-	s.Step(`^I am in a directory "([^"]*)"$`, c.iAmInDirectory)
-	s.Step(`^I have a (file|directory) named "([^"]*)"$`, c.iHaveFileOrDirectoryNamed)
-	s.Step(`^I run ls$`, c.iRunLs)
-	s.Step(`^I should get output:$`, c.iShouldGetOutput)
-}
-
-func (f *lsFeature) iAmInDirectory(name string) error {
-	f.dir = os.TempDir() + "/" + name
-	if err := os.RemoveAll(f.dir); err != nil && !os.IsNotExist(err) {
-		return err
-	}
-	return os.Mkdir(f.dir, 0775)
-}
-
-func (f *lsFeature) iHaveFileOrDirectoryNamed(typ, name string) (err error) {
-	if len(f.dir) == 0 {
-		return fmt.Errorf("the directory was not chosen yet")
-	}
-	switch typ {
-	case "file":
-		err = ioutil.WriteFile(f.dir+"/"+name, []byte{}, 0664)
-	case "directory":
-		err = os.Mkdir(f.dir+"/"+name, 0775)
-	}
-	return err
-}
-
-func (f *lsFeature) iShouldGetOutput(names *gherkin.DocString) error {
-	expected := strings.Split(names.Content, "\n")
-	actual := strings.Split(strings.TrimSpace(f.buf.String()), "\n")
-	if len(expected) != len(actual) {
-		return fmt.Errorf("number of expected output lines %d, does not match actual: %d", len(expected), len(actual))
-	}
-	for i, line := range actual {
-		if line != expected[i] {
-			return fmt.Errorf(`expected line "%s" at position: %d to match "%s", but it did not`, expected[i], i, line)
-		}
-	}
-	return nil
-}
-
-func (f *lsFeature) iRunLs() error {
-	f.buf.Reset()
-	return ls(f.dir, f.buf)
-}

flags.go

@@ -5,7 +5,9 @@ import (
 	"fmt"
 )
 
-func flags(s *suite) *flag.FlagSet {
+// Flags builds a *flag.FlagSet with all flags
+// required for the godog suite
+func flags(s *Suite) *flag.FlagSet {
 	set := flag.NewFlagSet("godog", flag.ExitOnError)
 	set.StringVar(&s.format, "format", "pretty", "")
 	set.StringVar(&s.format, "f", "pretty", "")

fmt.go

@@ -30,7 +30,7 @@ var undefinedSnippetsTpl = template.Must(template.New("snippets").Funcs(snippetH
 	return godog.ErrPending
 }
 
-{{end}}func featureContext(s godog.Suite) { {{ range . }}
+{{end}}func featureContext(s *godog.Suite) { {{ range . }}
 	s.Step({{ backticked .Expr }}, {{ .Method }}){{end}}
 }
 `))

suite.go

@@ -28,52 +28,18 @@ var ErrUndefined = fmt.Errorf("step is undefined")
 // step implementation is pending
 var ErrPending = fmt.Errorf("step implementation is pending")
 
-// Suite is an interface which allows various contexts
+// Suite allows various contexts
 // to register steps and event handlers.
 //
-// When running a test suite, this interface is passed
-// to all functions (contexts), which have it as a
-// first and only argument.
+// When running a test suite, the instance of Suite
+// is passed to all functions (contexts), which
+// have it as a first and only argument.
 //
 // Note that all event hooks does not catch panic errors
 // in order to have a trace information. Only step
 // executions are catching panic error since it may
 // be a context specific error.
-type Suite interface {
-	// Run the test suite
-	Run()
-
-	// Registers a step which will execute stepFunc
-	// on step expr match
-	//
-	// expr can be either a string or a *regexp.Regexp
-	// stepFunc is a func to handle the step, arguments
-	// are set from matched step
-	Step(expr interface{}, h interface{})
-
-	// BeforeSuite registers a func to run on initial
-	// suite startup
-	BeforeSuite(f func())
-
-	// BeforeScenario registers a func to run before
-	// every *gherkin.Scenario or *gherkin.ScenarioOutline
-	BeforeScenario(f func(interface{}))
-
-	// BeforeStep register a handler before every step
-	BeforeStep(f func(*gherkin.Step))
-
-	// AfterStep register a handler after every step
-	AfterStep(f func(*gherkin.Step, error))
-
-	// AfterScenario registers a func to run after
-	// every *gherkin.Scenario or *gherkin.ScenarioOutline
-	AfterScenario(f func(interface{}, error))
-
-	// AfterSuite runs func int the end of tests
-	AfterSuite(f func())
-}
-
-type suite struct {
+type Suite struct {
 	steps    []*StepDef
 	features []*feature
 	fmt      Formatter
@@ -98,24 +64,27 @@ type suite struct {
 }
 
 // New initializes a Suite. The instance is passed around
-// to all context initialization functions from *_test.go files
-func New() Suite {
-	return &suite{}
+// to all context initialization functions from *_test.go files.
+func New() *Suite {
+	return &Suite{}
 }
 
-// Step allows to register a StepHandler in Godog
-// feature suite, the handler will be applied to all
-// steps matching the given Regexp expr
+// Step allows to register a *StepDef in Godog
+// feature suite, the definition will be applied
+// to all steps matching the given Regexp expr.
 //
-// It will panic if expr is not a valid regular expression
+// It will panic if expr is not a valid regular
+// expression or stepFunc is not a valid step
+// handler.
 //
-// Note that if there are two handlers which may match
-// the same step, then the only first matched handler
+// Note that if there are two definitions which may match
+// the same step, then only the first matched handler
 // will be applied.
 //
-// If none of the StepHandlers are matched, then
-// ErrUndefined error will be returned.
-func (s *suite) Step(expr interface{}, stepFunc interface{}) {
+// If none of the *StepDef is matched, then
+// ErrUndefined error will be returned when
+// running steps.
+func (s *Suite) Step(expr interface{}, stepFunc interface{}) {
 	var regex *regexp.Regexp
 
 	switch t := expr.(type) {
@@ -152,7 +121,7 @@ func (s *suite) Step(expr interface{}, stepFunc interface{}) {
 //
 // Use it to prepare the test suite for a spin.
 // Connect and prepare database for instance...
-func (s *suite) BeforeSuite(f func()) {
+func (s *Suite) BeforeSuite(f func()) {
 	s.beforeSuiteHandlers = append(s.beforeSuiteHandlers, f)
 }
 
@@ -165,13 +134,13 @@ func (s *suite) BeforeSuite(f func()) {
 // It is a good practice to restore the default state
 // before every scenario so it would be isolated from
 // any kind of state.
-func (s *suite) BeforeScenario(f func(interface{})) {
+func (s *Suite) BeforeScenario(f func(interface{})) {
 	s.beforeScenarioHandlers = append(s.beforeScenarioHandlers, f)
 }
 
 // BeforeStep registers a function or method
 // to be run before every scenario
-func (s *suite) BeforeStep(f func(*gherkin.Step)) {
+func (s *Suite) BeforeStep(f func(*gherkin.Step)) {
 	s.beforeStepHandlers = append(s.beforeStepHandlers, f)
 }
 
@@ -184,7 +153,7 @@ func (s *suite) BeforeStep(f func(*gherkin.Step)) {
 //
 // In some cases, for example when running a headless
 // browser, to take a screenshot after failure.
-func (s *suite) AfterStep(f func(*gherkin.Step, error)) {
+func (s *Suite) AfterStep(f func(*gherkin.Step, error)) {
 	s.afterStepHandlers = append(s.afterStepHandlers, f)
 }
 
@@ -193,18 +162,18 @@ func (s *suite) AfterStep(f func(*gherkin.Step, error)) {
 //
 // The interface argument may be *gherkin.Scenario
 // or *gherkin.ScenarioOutline
-func (s *suite) AfterScenario(f func(interface{}, error)) {
+func (s *Suite) AfterScenario(f func(interface{}, error)) {
 	s.afterScenarioHandlers = append(s.afterScenarioHandlers, f)
 }
 
 // AfterSuite registers a function or method
 // to be run once after suite runner
-func (s *suite) AfterSuite(f func()) {
+func (s *Suite) AfterSuite(f func()) {
 	s.afterSuiteHandlers = append(s.afterSuiteHandlers, f)
 }
 
 // Run starts the Godog feature suite
-func (s *suite) Run() {
+func (s *Suite) Run() {
 	flagSet := flags(s)
 	fatal(flagSet.Parse(os.Args[1:]))
 
@@ -249,7 +218,7 @@ func (s *suite) Run() {
 	}
 }
 
-func (s *suite) run() {
+func (s *Suite) run() {
 	// run before suite handlers
 	for _, f := range s.beforeSuiteHandlers {
 		f()
@@ -269,7 +238,7 @@ func (s *suite) run() {
 	s.fmt.Summary()
 }
 
-func (s *suite) matchStep(step *gherkin.Step) *StepDef {
+func (s *Suite) matchStep(step *gherkin.Step) *StepDef {
 	for _, h := range s.steps {
 		if m := h.Expr.FindStringSubmatch(step.Text); len(m) > 0 {
 			var args []interface{}
@@ -286,7 +255,7 @@ func (s *suite) matchStep(step *gherkin.Step) *StepDef {
 	return nil
 }
 
-func (s *suite) runStep(step *gherkin.Step, prevStepErr error) (err error) {
+func (s *Suite) runStep(step *gherkin.Step, prevStepErr error) (err error) {
 	match := s.matchStep(step)
 	if match == nil {
 		s.fmt.Undefined(step)
@@ -330,7 +299,7 @@ func (s *suite) runStep(step *gherkin.Step, prevStepErr error) (err error) {
 	return
 }
 
-func (s *suite) runSteps(steps []*gherkin.Step, prevErr error) (err error) {
+func (s *Suite) runSteps(steps []*gherkin.Step, prevErr error) (err error) {
 	err = prevErr
 	for _, step := range steps {
 		stepErr := s.runStep(step, err)
@@ -347,13 +316,13 @@ func (s *suite) runSteps(steps []*gherkin.Step, prevErr error) (err error) {
 	return
 }
 
-func (s *suite) skipSteps(steps []*gherkin.Step) {
+func (s *Suite) skipSteps(steps []*gherkin.Step) {
 	for _, step := range steps {
 		s.fmt.Skipped(step)
 	}
 }
 
-func (s *suite) runOutline(outline *gherkin.ScenarioOutline, b *gherkin.Background) (failErr error) {
+func (s *Suite) runOutline(outline *gherkin.ScenarioOutline, b *gherkin.Background) (failErr error) {
 	s.fmt.Node(outline)
 
 	for _, example := range outline.Examples {
@@ -403,7 +372,7 @@ func (s *suite) runOutline(outline *gherkin.ScenarioOutline, b *gherkin.Backgrou
 	return
 }
 
-func (s *suite) runFeature(f *feature) {
+func (s *Suite) runFeature(f *feature) {
 	s.fmt.Feature(f.Feature, f.Path)
 	for _, scenario := range f.ScenarioDefinitions {
 		var err error
@@ -425,7 +394,7 @@ func (s *suite) runFeature(f *feature) {
 	}
 }
 
-func (s *suite) runScenario(scenario *gherkin.Scenario, b *gherkin.Background) (err error) {
+func (s *Suite) runScenario(scenario *gherkin.Scenario, b *gherkin.Background) (err error) {
 	// run before scenario handlers
 	for _, f := range s.beforeScenarioHandlers {
 		f(scenario)
@@ -448,7 +417,7 @@ func (s *suite) runScenario(scenario *gherkin.Scenario, b *gherkin.Background) (
 	return
 }
 
-func (s *suite) printStepDefinitions() {
+func (s *Suite) printStepDefinitions() {
 	var longest int
 	for _, def := range s.steps {
 		if longest < len(def.Expr.String()) {
@@ -465,7 +434,7 @@ func (s *suite) printStepDefinitions() {
 	}
 }
 
-func (s *suite) parseFeatures() (err error) {
+func (s *Suite) parseFeatures() (err error) {
 	for _, pat := range s.paths {
 		// check if line number is specified
 		parts := strings.Split(pat, ":")
@@ -525,7 +494,7 @@ func (s *suite) parseFeatures() (err error) {
 	return
 }
 
-func (s *suite) applyTagFilter(ft *gherkin.Feature) {
+func (s *Suite) applyTagFilter(ft *gherkin.Feature) {
 	if len(s.tags) == 0 {
 		return
 	}
@@ -585,7 +554,7 @@ func hasTag(tags []string, tag string) bool {
 }
 
 // based on http://behat.readthedocs.org/en/v2.5/guides/6.cli.html#gherkin-filters
-func (s *suite) matchesTags(tags []string) (ok bool) {
+func (s *Suite) matchesTags(tags []string) (ok bool) {
 	ok = true
 	for _, andTags := range strings.Split(s.tags, "&&") {
 		var okComma bool

suite_test.go

@@ -8,7 +8,7 @@ import (
 	"github.com/cucumber/gherkin-go"
 )
 
-func SuiteContext(s Suite) {
+func SuiteContext(s *Suite) {
 	c := &suiteContext{}
 
 	s.BeforeScenario(c.ResetBeforeEachScenario)
@@ -50,7 +50,7 @@ type firedEvent struct {
 }
 
 type suiteContext struct {
-	testedSuite *suite
+	testedSuite *Suite
 	events      []*firedEvent
 	fmt         *testFormatter
 }
@@ -58,7 +58,7 @@ type suiteContext struct {
 func (s *suiteContext) ResetBeforeEachScenario(interface{}) {
 	// reset whole suite with the state
 	s.fmt = &testFormatter{}
-	s.testedSuite = &suite{fmt: s.fmt}
+	s.testedSuite = &Suite{fmt: s.fmt}
 	// our tested suite will have the same context registered
 	SuiteContext(s.testedSuite)
 	// reset all fired events

tag_filter_test.go

@@ -5,14 +5,14 @@ import (
 )
 
 func assertNotMatchesTagFilter(tags []string, filter string, t *testing.T) {
-	s := &suite{tags: filter}
+	s := &Suite{tags: filter}
 	if s.matchesTags(tags) {
 		t.Errorf(`expected tags: %v not to match tag filter "%s", but it did`, tags, filter)
 	}
 }
 
 func assertMatchesTagFilter(tags []string, filter string, t *testing.T) {
-	s := &suite{tags: filter}
+	s := &Suite{tags: filter}
 	if !s.matchesTags(tags) {
 		t.Errorf(`expected tags: %v to match tag filter "%s", but it did not`, tags, filter)
 	}