go.tools/cmd/vet: use "go test" to test

- remove Makefile
- move test data into a subdirectory
- encapsulate the invocation of errchk into a standard Test using os.exec

R=golang-dev, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/9509045

cmd/vet/Makefile

@@ -1,14 +0,0 @@
-# Copyright 2010 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.
-
-# Assumes go/types is installed
-test testshort:
-	go build
-	$(GOROOT)/test/errchk ./vet -printfuncs='Warn:1,Warnf:1' test_*.go test_*.s
-
-# Install command where the go tool can find it.
-install:
-	go build -o _vet
-	cp _vet $(GOROOT)/pkg/tool/$(GOOS)_$(GOARCH)/vet
-	rm -f _vet

cmd/vet/testdata/asm.go

@@ -6,7 +6,7 @@
 
 // This file contains declarations to test the assembly in test_asm.s.
 
-package main
+package testdata
 
 func arg1(x int8, y uint8)
 func arg2(x int16, y uint16)

cmd/vet/testdata/assign.go

@@ -4,9 +4,7 @@
 
 // This file contains tests for the useless-assignment checker.
 
-// +build vet_test
-
-package main
+package testdata
 
 type ST struct {
 	x int

cmd/vet/testdata/atomic.go

@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build vet_test
-
 // This file contains tests for the atomic checker.
 
-package main
+package testdata
 
 import (
 	"sync/atomic"

cmd/vet/testdata/buildtag.go

@@ -4,11 +4,10 @@
 
 // This file contains tests for the buildtag checker.
 
-// +build vet_test
 // +builder // ERROR "possible malformed \+build comment"
 // +build !ignore
 
-package main
+package testdata
 
 // +build toolate // ERROR "build comment appears too late in file"
 

cmd/vet/testdata/deadcode.go

@@ -2,12 +2,11 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build vet_test
 // +build ignore
 
 // This file contains tests for the dead code checker.
 
-package main
+package testdata
 
 type T int
 

cmd/vet/testdata/method.go

@@ -4,11 +4,9 @@
 
 // This file contains tests for the canonical method checker.
 
-// +build vet_test
-
 // This file contains the code to check canonical methods.
 
-package main
+package testdata
 
 import (
 	"fmt"

cmd/vet/testdata/print.go

@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build vet_test
-
 // This file contains tests for the printf checker.
 
-package main
+package testdata
 
 import (
 	"fmt"

cmd/vet/testdata/rangeloop.go

@@ -4,9 +4,7 @@
 
 // This file contains tests for the rangeloop checker.
 
-// +build vet_test
-
-package main
+package testdata
 
 func RangeLoopTests() {
 	var s []int

cmd/vet/testdata/structtag.go

@@ -4,11 +4,9 @@
 
 // This file contains tests for the structtag checker.
 
-// +build vet_test
-
 // This file contains the test for canonical struct tags.
 
-package main
+package testdata
 
 type StructTagTest struct {
 	X int "hello" // ERROR "not compatible with reflect.StructTag.Get"

cmd/vet/testdata/taglit.go

@@ -4,11 +4,9 @@
 
 // This file contains tests for the untagged struct literal checker.
 
-// +build vet_test
-
 // This file contains the test for untagged struct literals.
 
-package main
+package testdata
 
 import (
 	"flag"

cmd/vet/vet_test.go

@@ -0,0 +1,64 @@
+// Copyright 2013 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 main_test
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"testing"
+)
+
+const (
+	dataDir = "testdata"
+	binary  = "testvet"
+)
+
+// Run this shell script, but do it in Go so it can be run by "go test".
+// 	go build -o testvet
+// 	$(GOROOT)/test/errchk ./testvet -printfuncs='Warn:1,Warnf:1' testdata/*.go testdata/*.s
+// 	rm testvet
+//
+func TestVet(t *testing.T) {
+	// Windows systems can't be guaranteed to have Perl and so can't run errchk.
+	if runtime.GOOS == "windows" {
+		t.Skip("skipping test; no Perl on Windows")
+	}
+
+	// go build
+	cmd := exec.Command("go", "build", "-o", binary)
+	run(cmd, t)
+
+	// defer removal of vet
+	defer os.Remove(binary)
+
+	// errchk ./testvet
+	gos, err := filepath.Glob(filepath.Join(dataDir, "*.go"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	asms, err := filepath.Glob(filepath.Join(dataDir, "*.s"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	files := append(gos, asms...)
+	errchk := filepath.Join(runtime.GOROOT(), "test", "errchk")
+	flags := []string{
+		binary,
+		"-printfuncs=Warn:1,Warnf:1",
+	}
+	cmd = exec.Command(errchk, append(flags, files...)...)
+	run(cmd, t)
+}
+
+func run(c *exec.Cmd, t *testing.T) {
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	err := c.Run()
+	if err != nil {
+		t.Fatal(err)
+	}
+}