flags_test.go

Documentation: golang.org/x/tools/go/analysis/internal/analysisflags

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package analysisflags_test
     6  
     7  import (
     8  	"fmt"
     9  	"os"
    10  	"os/exec"
    11  	"runtime"
    12  	"strings"
    13  	"testing"
    14  
    15  	"golang.org/x/tools/go/analysis"
    16  	"golang.org/x/tools/go/analysis/internal/analysisflags"
    17  )
    18  
    19  func main() {
    20  	fmt.Println(analysisflags.Parse([]*analysis.Analyzer{
    21  		{Name: "a1", Doc: "a1"},
    22  		{Name: "a2", Doc: "a2"},
    23  		{Name: "a3", Doc: "a3"},
    24  	}, true))
    25  	os.Exit(0)
    26  }
    27  
    28  // This test fork/execs the main function above.
    29  func TestExec(t *testing.T) {
    30  	if runtime.GOOS != "linux" {
    31  		t.Skipf("skipping fork/exec test on this platform")
    32  	}
    33  
    34  	progname := os.Args[0]
    35  
    36  	if os.Getenv("ANALYSISFLAGS_CHILD") == "1" {
    37  		// child process
    38  		os.Args = strings.Fields(progname + " " + os.Getenv("FLAGS"))
    39  		main()
    40  		panic("unreachable")
    41  	}
    42  
    43  	for _, test := range []struct {
    44  		flags string
    45  		want  string // output should contain want
    46  	}{
    47  		{"", "[a1 a2 a3]"},
    48  		{"-a1=0", "[a2 a3]"},
    49  		{"-a1=1", "[a1]"},
    50  		{"-a1", "[a1]"},
    51  		{"-a1=1 -a3=1", "[a1 a3]"},
    52  		{"-a1=1 -a3=0", "[a1]"},
    53  		{"-V=full", "analysisflags.test version devel"},
    54  	} {
    55  		cmd := exec.Command(progname, "-test.run=TestExec")
    56  		cmd.Env = append(os.Environ(), "ANALYSISFLAGS_CHILD=1", "FLAGS="+test.flags)
    57  
    58  		output, err := cmd.CombinedOutput()
    59  		if err != nil {
    60  			t.Fatalf("exec failed: %v; output=<<%s>>", err, output)
    61  		}
    62  
    63  		got := strings.TrimSpace(string(output))
    64  		if !strings.Contains(got, test.want) {
    65  			t.Errorf("got %q, does not contain %q", got, test.want)
    66  		}
    67  	}
    68  }
    69
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