github.com/hairyhenderson/gomplate/v4@v4.0.0-pre-2.0.20240520121557-362f058f0c93/internal/datafs/stdinfs_test.go (about)

     1  package datafs
     2  
     3  import (
     4  	"bytes"
     5  	"context"
     6  	"io"
     7  	"io/fs"
     8  	"net/url"
     9  	"testing"
    10  
    11  	"github.com/hairyhenderson/go-fsimpl"
    12  	"github.com/stretchr/testify/assert"
    13  	"github.com/stretchr/testify/require"
    14  )
    15  
    16  func TestStdinFS_Open(t *testing.T) {
    17  	fsys, err := NewStdinFS(nil)
    18  	require.NoError(t, err)
    19  	assert.IsType(t, &stdinFS{}, fsys)
    20  
    21  	f, err := fsys.Open("foo")
    22  	require.NoError(t, err)
    23  	assert.IsType(t, &stdinFile{}, f)
    24  }
    25  
    26  func TestStdinFile_Read(t *testing.T) {
    27  	content := `hello world`
    28  
    29  	f := &stdinFile{name: "foo", body: bytes.NewBufferString(content)}
    30  	b := make([]byte, len(content))
    31  	n, err := f.Read(b)
    32  	require.NoError(t, err)
    33  	assert.Equal(t, len(content), n)
    34  	assert.Equal(t, content, string(b))
    35  }
    36  
    37  func TestStdinFile_Stat(t *testing.T) {
    38  	content := []byte(`hello world`)
    39  
    40  	f := &stdinFile{name: "hello", body: bytes.NewReader(content)}
    41  
    42  	fi, err := f.Stat()
    43  	require.NoError(t, err)
    44  	assert.Equal(t, int64(len(content)), fi.Size())
    45  
    46  	f = &stdinFile{name: "hello", body: &errorReader{err: fs.ErrPermission}}
    47  
    48  	_, err = f.Stat()
    49  	require.ErrorIs(t, err, fs.ErrPermission)
    50  }
    51  
    52  func TestStdinFS(t *testing.T) {
    53  	u, _ := url.Parse("stdin:")
    54  
    55  	content := []byte("\nhello file\n")
    56  
    57  	ctx := ContextWithStdin(context.Background(), bytes.NewReader(content))
    58  
    59  	fsys, err := NewStdinFS(u)
    60  	require.NoError(t, err)
    61  	assert.IsType(t, &stdinFS{}, fsys)
    62  
    63  	_, ok := fsys.(*stdinFS)
    64  	assert.True(t, ok)
    65  
    66  	fsys = fsimpl.WithContextFS(ctx, fsys)
    67  
    68  	b, err := fs.ReadFile(fsys, "foo")
    69  	require.NoError(t, err)
    70  	assert.Equal(t, "\nhello file\n", string(b))
    71  
    72  	ctx = ContextWithStdin(context.Background(), bytes.NewReader(content))
    73  	fsys = fsimpl.WithContextFS(ctx, fsys)
    74  
    75  	_, err = fsys.Open("..")
    76  	require.ErrorIs(t, err, fs.ErrInvalid)
    77  
    78  	_, err = fs.ReadFile(fsys, "/foo")
    79  	require.ErrorIs(t, err, fs.ErrInvalid)
    80  
    81  	f, err := fsys.Open("doesn't matter what it's named.txt")
    82  	require.NoError(t, err)
    83  
    84  	fi, err := f.Stat()
    85  	require.NoError(t, err)
    86  	assert.Equal(t, int64(len(content)), fi.Size())
    87  
    88  	b, err = io.ReadAll(f)
    89  	require.NoError(t, err)
    90  	assert.Equal(t, content, b)
    91  
    92  	err = f.Close()
    93  	require.NoError(t, err)
    94  
    95  	err = f.Close()
    96  	require.ErrorIs(t, err, fs.ErrClosed)
    97  
    98  	p := make([]byte, 5)
    99  	_, err = f.Read(p)
   100  	require.Error(t, err)
   101  	require.ErrorIs(t, err, io.EOF)
   102  }
   103  
   104  type errorReader struct {
   105  	err error
   106  }
   107  
   108  func (r *errorReader) Read(_ []byte) (int, error) {
   109  	return 0, r.err
   110  }