undocker/main_test.go

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package main
import (
"bytes"
"io"
"io/ioutil"
"path/filepath"
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"regexp"
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"testing"
)
func TestExecute(t *testing.T) {
var _foo = []byte("foo foo")
tests := []struct {
name string
fixture func(*testing.T, string)
infile string
outfile string
wantErr string
}{
{
name: "ok passthrough via stdout",
infile: "t10-in.txt",
fixture: func(t *testing.T, dir string) {
fname := filepath.Join(dir, "t10-in.txt")
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if err := ioutil.WriteFile(fname, _foo, 0644); err != nil {
t.Fatalf("unexpected error: %v", err)
}
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},
outfile: "-",
},
{
name: "ok passthrough via file",
infile: "t20-in.txt",
fixture: func(t *testing.T, dir string) {
fname := filepath.Join(dir, "t20-in.txt")
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if err := ioutil.WriteFile(fname, _foo, 0644); err != nil {
t.Fatalf("unexpected error: %v", err)
}
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},
outfile: "t20-out.txt",
},
{
name: "infile does not exist",
infile: "t3-does-not-exist.txt",
wantErr: "^open .*t3-does-not-exist.txt: no such file or directory$",
},
{
name: "outpath dir not writable",
outfile: filepath.Join("t4", "does", "not", "exist"),
wantErr: "^create: open .*/t4/does/not/exist: no such file or directory",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
dir := t.TempDir()
var stdout bytes.Buffer
c := &command{Stdout: &stdout}
if tt.fixture != nil {
tt.fixture(t, dir)
}
if tt.outfile != "-" {
tt.outfile = filepath.Join(dir, tt.outfile)
}
inf := filepath.Join(dir, tt.infile)
c.flattener = flattenPassthrough
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err := c.execute(inf, tt.outfile)
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if tt.wantErr != "" {
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if err == nil {
t.Fatal("expected error, got nil")
}
r := regexp.MustCompile(tt.wantErr)
if r.FindStringIndex(err.Error()) == nil {
t.Errorf("%s not found in %s", tt.wantErr, err.Error())
}
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return
}
var out []byte
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if err != nil {
t.Fatalf("unexpected error: %v", err)
}
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if tt.outfile == "-" {
out = stdout.Bytes()
} else {
out, err = ioutil.ReadFile(tt.outfile)
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if err != nil {
t.Fatalf("unexpected error: %v", err)
}
}
if !bytes.Equal([]byte("foo foo"), out) {
t.Errorf("out != foo foo: %s", string(out))
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}
})
}
}
func flattenPassthrough(r io.ReadSeeker, w io.Writer) error {
_, err := io.Copy(w, r)
return err
}