1 files changed, 149 insertions, 0 deletions
diff --git a/src/cmd/test2json/main.go b/src/cmd/test2json/main.go
new file mode 100644
index 0000000..fdf681a
--- /dev/null
+++ b/src/cmd/test2json/main.go
@@ -0,0 +1,149 @@
+// 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.
+
+// Test2json converts go test output to a machine-readable JSON stream.
+//
+// Usage:
+//
+//	go tool test2json [-p pkg] [-t] [./pkg.test -test.v [-test.paniconexit0]]
+//
+// Test2json runs the given test command and converts its output to JSON;
+// with no command specified, test2json expects test output on standard input.
+// It writes a corresponding stream of JSON events to standard output.
+// There is no unnecessary input or output buffering, so that
+// the JSON stream can be read for “live updates” of test status.
+//
+// The -p flag sets the package reported in each test event.
+//
+// The -t flag requests that time stamps be added to each test event.
+//
+// The test must be invoked with -test.v. Additionally passing
+// -test.paniconexit0 will cause test2json to exit with a non-zero
+// status if one of the tests being run calls os.Exit(0).
+//
+// Note that test2json is only intended for converting a single test
+// binary's output. To convert the output of a "go test" command,
+// use "go test -json" instead of invoking test2json directly.
+//
+// Output Format
+//
+// The JSON stream is a newline-separated sequence of TestEvent objects
+// corresponding to the Go struct:
+//
+//	type TestEvent struct {
+//		Time    time.Time // encodes as an RFC3339-format string
+//		Action  string
+//		Package string
+//		Test    string
+//		Elapsed float64 // seconds
+//		Output  string
+//	}
+//
+// The Time field holds the time the event happened.
+// It is conventionally omitted for cached test results.
+//
+// The Action field is one of a fixed set of action descriptions:
+//
+//	run    - the test has started running
+//	pause  - the test has been paused
+//	cont   - the test has continued running
+//	pass   - the test passed
+//	bench  - the benchmark printed log output but did not fail
+//	fail   - the test or benchmark failed
+//	output - the test printed output
+//	skip   - the test was skipped or the package contained no tests
+//
+// The Package field, if present, specifies the package being tested.
+// When the go command runs parallel tests in -json mode, events from
+// different tests are interlaced; the Package field allows readers to
+// separate them.
+//
+// The Test field, if present, specifies the test, example, or benchmark
+// function that caused the event. Events for the overall package test
+// do not set Test.
+//
+// The Elapsed field is set for "pass" and "fail" events. It gives the time
+// elapsed for the specific test or the overall package test that passed or failed.
+//
+// The Output field is set for Action == "output" and is a portion of the test's output
+// (standard output and standard error merged together). The output is
+// unmodified except that invalid UTF-8 output from a test is coerced
+// into valid UTF-8 by use of replacement characters. With that one exception,
+// the concatenation of the Output fields of all output events is the exact
+// output of the test execution.
+//
+// When a benchmark runs, it typically produces a single line of output
+// giving timing results. That line is reported in an event with Action == "output"
+// and no Test field. If a benchmark logs output or reports a failure
+// (for example, by using b.Log or b.Error), that extra output is reported
+// as a sequence of events with Test set to the benchmark name, terminated
+// by a final event with Action == "bench" or "fail".
+// Benchmarks have no events with Action == "run", "pause", or "cont".
+//
+package main
+
+import (
+	"flag"
+	"fmt"
+	exec "internal/execabs"
+	"io"
+	"os"
+
+	"cmd/internal/test2json"
+)
+
+var (
+	flagP = flag.String("p", "", "report `pkg` as the package being tested in each event")
+	flagT = flag.Bool("t", false, "include timestamps in events")
+)
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: go tool test2json [-p pkg] [-t] [./pkg.test -test.v]\n")
+	os.Exit(2)
+}
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+
+	var mode test2json.Mode
+	if *flagT {
+		mode |= test2json.Timestamp
+	}
+	c := test2json.NewConverter(os.Stdout, *flagP, mode)
+	defer c.Close()
+
+	if flag.NArg() == 0 {
+		io.Copy(c, os.Stdin)
+	} else {
+		args := flag.Args()
+		cmd := exec.Command(args[0], args[1:]...)
+		w := &countWriter{0, c}
+		cmd.Stdout = w
+		cmd.Stderr = w
+		err := cmd.Run()
+		if err != nil {
+			if w.n > 0 {
+				// Assume command printed why it failed.
+			} else {
+				fmt.Fprintf(c, "test2json: %v\n", err)
+			}
+		}
+		c.Exited(err)
+		if err != nil {
+			c.Close()
+			os.Exit(1)
+		}
+	}
+}
+
+type countWriter struct {
+	n int64
+	w io.Writer
+}
+
+func (w *countWriter) Write(b []byte) (int, error) {
+	w.n += int64(len(b))
+	return w.w.Write(b)
+}