namespace_test.go

Documentation: golang.org/x/tools/godoc/vfs

     1  // Copyright 2016 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 vfs_test
     6  
     7  import (
     8  	"fmt"
     9  	"strings"
    10  	"testing"
    11  	"time"
    12  
    13  	"golang.org/x/tools/godoc/vfs"
    14  	"golang.org/x/tools/godoc/vfs/mapfs"
    15  )
    16  
    17  func TestNewNameSpace(t *testing.T) {
    18  
    19  	// We will mount this filesystem under /fs1
    20  	mount := mapfs.New(map[string]string{"fs1file": "abcdefgh"})
    21  
    22  	// Existing process. This should give error on Stat("/")
    23  	t1 := vfs.NameSpace{}
    24  	t1.Bind("/fs1", mount, "/", vfs.BindReplace)
    25  
    26  	// using NewNameSpace. This should work fine.
    27  	t2 := vfs.NewNameSpace()
    28  	t2.Bind("/fs1", mount, "/", vfs.BindReplace)
    29  
    30  	testcases := map[string][]bool{
    31  		"/":            {false, true},
    32  		"/fs1":         {true, true},
    33  		"/fs1/fs1file": {true, true},
    34  	}
    35  
    36  	fss := []vfs.FileSystem{t1, t2}
    37  
    38  	for j, fs := range fss {
    39  		for k, v := range testcases {
    40  			_, err := fs.Stat(k)
    41  			result := err == nil
    42  			if result != v[j] {
    43  				t.Errorf("fs: %d, testcase: %s, want: %v, got: %v, err: %s", j, k, v[j], result, err)
    44  			}
    45  		}
    46  	}
    47  
    48  	fi, err := t2.Stat("/")
    49  	if err != nil {
    50  		t.Fatal(err)
    51  	}
    52  
    53  	if fi.Name() != "/" {
    54  		t.Errorf("t2.Name() : want:%s got:%s", "/", fi.Name())
    55  	}
    56  
    57  	if !fi.ModTime().IsZero() {
    58  		t.Errorf("t2.ModTime() : want:%v got:%v", time.Time{}, fi.ModTime())
    59  	}
    60  }
    61  
    62  func TestReadDirUnion(t *testing.T) {
    63  	for _, tc := range []struct {
    64  		desc       string
    65  		ns         vfs.NameSpace
    66  		path, want string
    67  	}{
    68  		{
    69  			desc: "no_go_files",
    70  			ns: func() vfs.NameSpace {
    71  				rootFs := mapfs.New(map[string]string{
    72  					"doc/a.txt":       "1",
    73  					"doc/b.txt":       "1",
    74  					"doc/dir1/d1.txt": "",
    75  				})
    76  				docFs := mapfs.New(map[string]string{
    77  					"doc/a.txt":       "22",
    78  					"doc/dir2/d2.txt": "",
    79  				})
    80  				ns := vfs.NameSpace{}
    81  				ns.Bind("/", rootFs, "/", vfs.BindReplace)
    82  				ns.Bind("/doc", docFs, "/doc", vfs.BindBefore)
    83  				return ns
    84  			}(),
    85  			path: "/doc",
    86  			want: "a.txt:2,b.txt:1,dir1:0,dir2:0",
    87  		}, {
    88  			desc: "have_go_files",
    89  			ns: func() vfs.NameSpace {
    90  				a := mapfs.New(map[string]string{
    91  					"src/x/a.txt":        "",
    92  					"src/x/suba/sub.txt": "",
    93  				})
    94  				b := mapfs.New(map[string]string{
    95  					"src/x/b.go":         "package b",
    96  					"src/x/subb/sub.txt": "",
    97  				})
    98  				c := mapfs.New(map[string]string{
    99  					"src/x/c.txt":        "",
   100  					"src/x/subc/sub.txt": "",
   101  				})
   102  				ns := vfs.NameSpace{}
   103  				ns.Bind("/", a, "/", vfs.BindReplace)
   104  				ns.Bind("/", b, "/", vfs.BindAfter)
   105  				ns.Bind("/", c, "/", vfs.BindAfter)
   106  				return ns
   107  			}(),
   108  			path: "/src/x",
   109  			want: "b.go:9,suba:0,subb:0,subc:0",
   110  		}, {
   111  			desc: "empty_mount",
   112  			ns: func() vfs.NameSpace {
   113  				ns := vfs.NameSpace{}
   114  				ns.Bind("/empty", mapfs.New(nil), "/empty", vfs.BindReplace)
   115  				return ns
   116  			}(),
   117  			path: "/",
   118  			want: "empty:0",
   119  		},
   120  	} {
   121  		t.Run(tc.desc, func(t *testing.T) {
   122  			fis, err := tc.ns.ReadDir(tc.path)
   123  			if err != nil {
   124  				t.Fatal(err)
   125  			}
   126  			buf := &strings.Builder{}
   127  			sep := ""
   128  			for _, fi := range fis {
   129  				fmt.Fprintf(buf, "%s%s:%d", sep, fi.Name(), fi.Size())
   130  				sep = ","
   131  			}
   132  			if got := buf.String(); got != tc.want {
   133  				t.Errorf("got %q; want %q", got, tc.want)
   134  			}
   135  		})
   136  	}
   137  }
   138
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