fix for progress printing with concurrency mode

fmt_progress.go

@@ -15,6 +15,7 @@ func init() {
 }
 
 func progressFunc(suite string, out io.Writer) Formatter {
+	steps := 0
 	return &progress{
 		basefmt: basefmt{
 			started: timeNowFunc(),
@@ -22,35 +23,37 @@ func progressFunc(suite string, out io.Writer) Formatter {
 			out:     out,
 		},
 		stepsPerRow: 70,
+		lock:        new(sync.Mutex),
+		steps:       &steps,
 	}
 }
 
 type progress struct {
 	basefmt
-	sync.Mutex
+	lock        *sync.Mutex
 	stepsPerRow int
-	steps       int
+	steps       *int
 }
 
 func (f *progress) Node(n interface{}) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Node(n)
 }
 
 func (f *progress) Feature(ft *gherkin.Feature, p string, c []byte) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Feature(ft, p, c)
 }
 
 func (f *progress) Summary() {
-	left := math.Mod(float64(f.steps), float64(f.stepsPerRow))
+	left := math.Mod(float64(*f.steps), float64(f.stepsPerRow))
 	if left != 0 {
-		if f.steps > f.stepsPerRow {
-			fmt.Fprintf(f.out, s(f.stepsPerRow-int(left))+fmt.Sprintf(" %d\n", f.steps))
+		if *f.steps > f.stepsPerRow {
+			fmt.Fprintf(f.out, s(f.stepsPerRow-int(left))+fmt.Sprintf(" %d\n", *f.steps))
 		} else {
-			fmt.Fprintf(f.out, " %d\n", f.steps)
+			fmt.Fprintf(f.out, " %d\n", *f.steps)
 		}
 	}
 	fmt.Fprintln(f.out, "")
@@ -79,43 +82,43 @@ func (f *progress) step(res *stepResult) {
 	case pending:
 		fmt.Fprint(f.out, yellow("P"))
 	}
-	f.steps++
-	if math.Mod(float64(f.steps), float64(f.stepsPerRow)) == 0 {
-		fmt.Fprintf(f.out, " %d\n", f.steps)
+	*f.steps++
+	if math.Mod(float64(*f.steps), float64(f.stepsPerRow)) == 0 {
+		fmt.Fprintf(f.out, " %d\n", *f.steps)
 	}
 }
 
 func (f *progress) Passed(step *gherkin.Step, match *StepDef) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Passed(step, match)
 	f.step(f.passed[len(f.passed)-1])
 }
 
 func (f *progress) Skipped(step *gherkin.Step, match *StepDef) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Skipped(step, match)
 	f.step(f.skipped[len(f.skipped)-1])
 }
 
 func (f *progress) Undefined(step *gherkin.Step, match *StepDef) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Undefined(step, match)
 	f.step(f.undefined[len(f.undefined)-1])
 }
 
 func (f *progress) Failed(step *gherkin.Step, match *StepDef, err error) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Failed(step, match, err)
 	f.step(f.failed[len(f.failed)-1])
 }
 
 func (f *progress) Pending(step *gherkin.Step, match *StepDef) {
-	f.Lock()
-	defer f.Unlock()
+	f.lock.Lock()
+	defer f.lock.Unlock()
 	f.basefmt.Pending(step, match)
 	f.step(f.pending[len(f.pending)-1])
 }

run.go

@@ -61,6 +61,14 @@ func (r *runner) concurrent(rate int, formatterFn func() Formatter) (failed bool
 			if useFmtCopy {
 				fmtCopy = formatterFn()
 				suite.fmt = fmtCopy
+
+				// sync lock and steps for progress printing
+				if sf, ok := suite.fmt.(*progress); ok {
+					if rf, ok := r.fmt.(*progress); ok {
+						sf.lock = rf.lock
+						sf.steps = rf.steps
+					}
+				}
 			} else {
 				suite.fmt = r.fmt
 			}

run_test.go

@@ -275,3 +275,40 @@ func TestFeatureFilePathParser(t *testing.T) {
 		}
 	}
 }
+
+func TestSucceedWithConcurrencyOption(t *testing.T) {
+	output := new(bytes.Buffer)
+
+	opt := Options{
+		Format:      "progress",
+		NoColors:    true,
+		Paths:       []string{"features"},
+		Concurrency: 2,
+		Output:      output,
+	}
+
+	expectedOutput := `...................................................................... 70
+...................................................................... 140
+...................................................................... 210
+.......................................                                249
+
+
+60 scenarios (60 passed)
+249 steps (249 passed)
+0s`
+
+	status := RunWithOptions("succeed", func(s *Suite) { SuiteContext(s) }, opt)
+	if status != exitSuccess {
+		t.Fatalf("expected exit status to be 0, but was: %d", status)
+	}
+
+	b, err := ioutil.ReadAll(output)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	out := strings.TrimSpace(string(b))
+	if out != expectedOutput {
+		t.Fatalf("unexpected output: \"%s\"", out)
+	}
+}