1 files changed, 135 insertions, 0 deletions
diff --git a/src/testing/helper_test.go b/src/testing/helper_test.go
new file mode 100644
index 0000000..b27fd62
--- /dev/null
+++ b/src/testing/helper_test.go
@@ -0,0 +1,135 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package testing
+
+import (
+	"bytes"
+	"regexp"
+	"strings"
+)
+
+func TestTBHelper(t *T) {
+	var buf bytes.Buffer
+	ctx := newTestContext(1, newMatcher(regexp.MatchString, "", ""))
+	t1 := &T{
+		common: common{
+			signal: make(chan bool),
+			w:      &buf,
+		},
+		context: ctx,
+	}
+	t1.Run("Test", testHelper)
+
+	want := `--- FAIL: Test (?s)
+helperfuncs_test.go:12: 0
+helperfuncs_test.go:33: 1
+helperfuncs_test.go:21: 2
+helperfuncs_test.go:35: 3
+helperfuncs_test.go:42: 4
+--- FAIL: Test/sub (?s)
+helperfuncs_test.go:45: 5
+helperfuncs_test.go:21: 6
+helperfuncs_test.go:44: 7
+helperfuncs_test.go:56: 8
+helperfuncs_test.go:64: 9
+helperfuncs_test.go:60: 10
+`
+	lines := strings.Split(buf.String(), "\n")
+	durationRE := regexp.MustCompile(`\(.*\)$`)
+	for i, line := range lines {
+		line = strings.TrimSpace(line)
+		line = durationRE.ReplaceAllString(line, "(?s)")
+		lines[i] = line
+	}
+	got := strings.Join(lines, "\n")
+	if got != want {
+		t.Errorf("got output:\n\n%s\nwant:\n\n%s", got, want)
+	}
+}
+
+func TestTBHelperParallel(t *T) {
+	var buf bytes.Buffer
+	ctx := newTestContext(1, newMatcher(regexp.MatchString, "", ""))
+	t1 := &T{
+		common: common{
+			signal: make(chan bool),
+			w:      &buf,
+		},
+		context: ctx,
+	}
+	t1.Run("Test", parallelTestHelper)
+
+	lines := strings.Split(strings.TrimSpace(buf.String()), "\n")
+	if len(lines) != 6 {
+		t.Fatalf("parallelTestHelper gave %d lines of output; want 6", len(lines))
+	}
+	want := "helperfuncs_test.go:21: parallel"
+	if got := strings.TrimSpace(lines[1]); got != want {
+		t.Errorf("got output line %q; want %q", got, want)
+	}
+}
+
+func TestTBHelperLineNumer(t *T) {
+	var buf bytes.Buffer
+	ctx := newTestContext(1, newMatcher(regexp.MatchString, "", ""))
+	t1 := &T{
+		common: common{
+			signal: make(chan bool),
+			w:      &buf,
+		},
+		context: ctx,
+	}
+	t1.Run("Test", func(t *T) {
+		helperA := func(t *T) {
+			t.Helper()
+			t.Run("subtest", func(t *T) {
+				t.Helper()
+				t.Fatal("fatal error message")
+			})
+		}
+		helperA(t)
+	})
+
+	want := "helper_test.go:92: fatal error message"
+	got := ""
+	lines := strings.Split(strings.TrimSpace(buf.String()), "\n")
+	if len(lines) > 0 {
+		got = strings.TrimSpace(lines[len(lines)-1])
+	}
+	if got != want {
+		t.Errorf("got output:\n\n%v\nwant:\n\n%v", got, want)
+	}
+}
+
+type noopWriter int
+
+func (nw *noopWriter) Write(b []byte) (int, error) { return len(b), nil }
+
+func BenchmarkTBHelper(b *B) {
+	w := noopWriter(0)
+	ctx := newTestContext(1, newMatcher(regexp.MatchString, "", ""))
+	t1 := &T{
+		common: common{
+			signal: make(chan bool),
+			w:      &w,
+		},
+		context: ctx,
+	}
+	f1 := func() {
+		t1.Helper()
+	}
+	f2 := func() {
+		t1.Helper()
+	}
+	b.ResetTimer()
+	b.ReportAllocs()
+	for i := 0; i < b.N; i++ {
+		if i&1 == 0 {
+			f1()
+		} else {
+			f2()
+		}
+	}
+}