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Source file src/runtime/env_test.go

Documentation: runtime

     1  // Copyright 2015 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 runtime_test
     6  
     7  import (
     8  	"runtime"
     9  	"syscall"
    10  	"testing"
    11  )
    12  
    13  func TestFixedGOROOT(t *testing.T) {
    14  	if runtime.GOOS == "plan9" {
    15  		t.Skipf("skipping plan9, it is inconsistent by allowing GOROOT to be updated by Setenv")
    16  	}
    17  
    18  	// Restore both the real GOROOT environment variable, and runtime's copies:
    19  	if orig, ok := syscall.Getenv("GOROOT"); ok {
    20  		defer syscall.Setenv("GOROOT", orig)
    21  	} else {
    22  		defer syscall.Unsetenv("GOROOT")
    23  	}
    24  	envs := runtime.Envs()
    25  	oldenvs := append([]string{}, envs...)
    26  	defer runtime.SetEnvs(oldenvs)
    27  
    28  	// attempt to reuse existing envs backing array.
    29  	want := runtime.GOROOT()
    30  	runtime.SetEnvs(append(envs[:0], "GOROOT="+want))
    31  
    32  	if got := runtime.GOROOT(); got != want {
    33  		t.Errorf(`initial runtime.GOROOT()=%q, want %q`, got, want)
    34  	}
    35  	if err := syscall.Setenv("GOROOT", "/os"); err != nil {
    36  		t.Fatal(err)
    37  	}
    38  	if got := runtime.GOROOT(); got != want {
    39  		t.Errorf(`after setenv runtime.GOROOT()=%q, want %q`, got, want)
    40  	}
    41  	if err := syscall.Unsetenv("GOROOT"); err != nil {
    42  		t.Fatal(err)
    43  	}
    44  	if got := runtime.GOROOT(); got != want {
    45  		t.Errorf(`after unsetenv runtime.GOROOT()=%q, want %q`, got, want)
    46  	}
    47  }
    48  

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