lang_test.go

     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 test
     6  
     7  import (
     8  	"internal/testenv"
     9  	"io/ioutil"
    10  	"os"
    11  	"os/exec"
    12  	"path/filepath"
    13  	"testing"
    14  )
    15  
    16  const aliasSrc = `
    17  package x
    18  
    19  type T = int
    20  `
    21  
    22  func TestInvalidLang(t *testing.T) {
    23  	t.Parallel()
    24  
    25  	testenv.MustHaveGoBuild(t)
    26  
    27  	dir, err := ioutil.TempDir("", "TestInvalidLang")
    28  	if err != nil {
    29  		t.Fatal(err)
    30  	}
    31  	defer os.RemoveAll(dir)
    32  
    33  	src := filepath.Join(dir, "alias.go")
    34  	if err := ioutil.WriteFile(src, []byte(aliasSrc), 0644); err != nil {
    35  		t.Fatal(err)
    36  	}
    37  
    38  	outfile := filepath.Join(dir, "alias.o")
    39  
    40  	if testLang(t, "go9.99", src, outfile) == nil {
    41  		t.Error("compilation with -lang=go9.99 succeeded unexpectedly")
    42  	}
    43  
    44  	// This test will have to be adjusted if we ever reach 1.99 or 2.0.
    45  	if testLang(t, "go1.99", src, outfile) == nil {
    46  		t.Error("compilation with -lang=go1.99 succeeded unexpectedly")
    47  	}
    48  
    49  	if testLang(t, "go1.8", src, outfile) == nil {
    50  		t.Error("compilation with -lang=go1.8 succeeded unexpectedly")
    51  	}
    52  
    53  	if err := testLang(t, "go1.9", src, outfile); err != nil {
    54  		t.Errorf("compilation with -lang=go1.9 failed unexpectedly: %v", err)
    55  	}
    56  }
    57  
    58  func testLang(t *testing.T, lang, src, outfile string) error {
    59  	run := []string{testenv.GoToolPath(t), "tool", "compile", "-lang", lang, "-o", outfile, src}
    60  	t.Log(run)
    61  	out, err := exec.Command(run[0], run[1:]...).CombinedOutput()
    62  	t.Logf("%s", out)
    63  	return err
    64  }
    65
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