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main_test.go
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main_test.go
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// Copyright 2016 Google Intt. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to writing, software distributed
// under the License is distributed on a "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"io"
"io/ioutil"
"os"
"strings"
"testing"
)
func TestEmbedStreams(t *testing.T) {
tc := []struct {
name string
in, out string
err string
d, w bool
foundDiff bool
}{
{name: "just some text",
in: "# hello\ntest\n",
out: "# hello\ntest\n",
},
{name: "can't rewrite stdin",
w: true,
err: "error: cannot use -w with standard input",
},
{name: "can't diff and rewrite",
w: true, d: true,
err: "error: cannot use -w and -d simultaneously",
},
{name: "empty diff",
d: true,
in: "# hello\ntest\n",
foundDiff: false,
},
{name: "non empty diff",
d: true,
in: "# hello\ntest",
out: `@@ -1,2 +1,3 @@
# hello
test
+
`,
foundDiff: true,
},
}
defer func(r io.Reader, w io.Writer) { stdin, stdout = r, w }(stdin, stdout)
for _, tt := range tc {
stdin = strings.NewReader(tt.in)
buf := &bytes.Buffer{}
stdout = buf
foundDiff, err := embed(nil, tt.w, tt.d)
if !eqErr(t, tt.name, err, tt.err) {
continue
}
if got := buf.String(); tt.out != got {
t.Errorf("case [%s] expected output\n%q\n; got\n%q", tt.name, tt.out, got)
}
if tt.d && foundDiff != tt.foundDiff {
if foundDiff {
t.Errorf("case [%s] expected to find a diff, but didn't", tt.name)
} else {
t.Errorf("case [%s] didn't expect to find a diff, but did", tt.name)
}
}
}
}
func TestEmbedFiles(t *testing.T) {
tc := []struct {
name string
in string
out string
err string
d, w bool
}{
{name: "rewriting a single file",
in: "one\ntwo\nthree",
w: true,
out: "one\ntwo\nthree\n",
},
{name: "diffing a single file",
in: "one\ntwo\nthree",
d: true,
out: "@@ -1 +1,4 @@\n+one\n+two\n+three\n \n",
},
}
defer func(f func(string) (file, error)) { openFile = f }(openFile)
for _, tt := range tc {
f := newFakeFile(tt.in)
openFile = func(path string) (file, error) { return f, nil }
stdout = os.Stdout
if tt.d {
stdout = &f.buf
}
_, err := embed([]string{"docs.md"}, tt.w, tt.d)
if !eqErr(t, tt.name, err, tt.err) {
continue
}
if got := f.buf.String(); tt.out != got {
t.Errorf("case [%s]: expected output \n%q; got\n%q", tt.name, tt.out, got)
}
}
}
func eqErr(t *testing.T, id string, err error, msg string) bool {
if err == nil && msg == "" {
return true
}
if err == nil && msg != "" {
t.Errorf("case [%s]: expected error message %q; but got nothing", id, msg)
return false
}
if err != nil && msg != err.Error() {
t.Errorf("case [%s]: expected error message %q; but got %q", id, msg, err)
}
return false
}
type fakeFile struct {
io.ReadCloser
buf bytes.Buffer
}
func (f *fakeFile) WriteAt(b []byte, offset int64) (int, error) { return f.buf.Write(b) }
func (f *fakeFile) Truncate(int64) error { return nil }
func newFakeFile(s string) *fakeFile {
return &fakeFile{ReadCloser: ioutil.NopCloser(strings.NewReader(s))}
}
func newOpenFunc(files map[string]string) func(string) (file, error) {
return func(path string) (file, error) {
if s, ok := files[path]; ok {
return newFakeFile(s), nil
}
return nil, os.ErrNotExist
}
}