test/fixedbugs: fix some tests will not be run

Currently, some tests under test/fixedbugs never run:

	$ for d in test/fixedbugs/*.dir; do
	  ! test -f "${d%.dir}.go" && echo "$d"
	done
	test/fixedbugs/issue15071.dir
	test/fixedbugs/issue15609.dir
	test/fixedbugs/issue29612.dir

Because they missed the corresponding ".go" file, so "go run run.go"
will skip them.

Add missing ".go" files for those tests to make sure they will be
collected and run.

While at it, add another action "runindir", which does "go run ."
inside the t.goDirName then check the output.

Change-Id: I88000b3663a6a615d90c1cf11844ea0377403e3d
Reviewed-on: https://go-review.googlesource.com/c/go/+/177798
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

test/fixedbugs/issue15071.go

@@ -0,0 +1,7 @@
+// rundir
+
+// Copyright 2019 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 ignored

test/fixedbugs/issue15609.go

@@ -0,0 +1,7 @@
+// runindir
+
+// Copyright 2019 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 ignored

test/fixedbugs/issue29612.go

@@ -0,0 +1,7 @@
+// runindir
+
+// Copyright 2019 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 ignored

test/run.go

@@ -522,7 +522,7 @@ func (t *test) run() {
 
 	// TODO: Clean up/simplify this switch statement.
 	switch action {
-	case "compile", "compiledir", "build", "builddir", "buildrundir", "run", "buildrun", "runoutput", "rundir", "asmcheck":
+	case "compile", "compiledir", "build", "builddir", "buildrundir", "run", "buildrun", "runoutput", "rundir", "runindir", "asmcheck":
 		// nothing to do
 	case "errorcheckandrundir":
 		wantError = false // should be no error if also will run
@@ -603,16 +603,19 @@ func (t *test) run() {
 	}
 
 	useTmp := true
+	runInDir := false
 	runcmd := func(args ...string) ([]byte, error) {
 		cmd := exec.Command(args[0], args[1:]...)
 		var buf bytes.Buffer
 		cmd.Stdout = &buf
 		cmd.Stderr = &buf
+		cmd.Env = os.Environ()
 		if useTmp {
 			cmd.Dir = t.tempDir
 			cmd.Env = envForDir(cmd.Dir)
-		} else {
-			cmd.Env = os.Environ()
+		}
+		if runInDir {
+			cmd.Dir = t.goDirName()
 		}
 
 		var err error
@@ -834,6 +837,28 @@ func (t *test) run() {
 			}
 		}
 
+	case "runindir":
+		// run "go run ." in t.goDirName()
+		// It's used when test requires go build and run the binary success.
+		// Example when long import path require (see issue29612.dir) or test
+		// contains assembly file (see issue15609.dir).
+		// Verify the expected output.
+		useTmp = false
+		runInDir = true
+		cmd := []string{goTool(), "run", goGcflags()}
+		if *linkshared {
+			cmd = append(cmd, "-linkshared")
+		}
+		cmd = append(cmd, ".")
+		out, err := runcmd(cmd...)
+		if err != nil {
+			t.err = err
+			return
+		}
+		if strings.Replace(string(out), "\r\n", "\n", -1) != t.expectedOutput() {
+			t.err = fmt.Errorf("incorrect output\n%s", out)
+		}
+
 	case "build":
 		// Build Go file.
 		_, err := runcmd(goTool(), "build", goGcflags(), "-o", "a.exe", long)