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// Copyright 2018 The Hugo Authors. 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 in writing, software
// distributed under the License is distributed on an "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 transform
import (
"bytes"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
func TestChainZeroTransformers(t *testing.T) {
tr := New()
in := new(bytes.Buffer)
out := new(bytes.Buffer)
if err := tr.Apply(in, out); err != nil {
t.Errorf("A zero transformer chain returned an error.")
}
}
func TestChaingMultipleTransformers(t *testing.T) {
f1 := func(ct FromTo) error {
_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f1"), []byte("f1r"), -1))
return err
}
f2 := func(ct FromTo) error {
_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f2"), []byte("f2r"), -1))
return err
}
f3 := func(ct FromTo) error {
_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f3"), []byte("f3r"), -1))
return err
}
f4 := func(ct FromTo) error {
_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f4"), []byte("f4r"), -1))
return err
}
tr := New(f1, f2, f3, f4)
out := new(bytes.Buffer)
if err := tr.Apply(out, strings.NewReader("Test: f4 f3 f1 f2 f1 The End.")); err != nil {
t.Errorf("Multi transformer chain returned an error: %s", err)
}
expected := "Test: f4r f3r f1r f2r f1r The End."
if string(out.Bytes()) != expected {
t.Errorf("Expected %s got %s", expected, string(out.Bytes()))
}
}
func TestNewEmptyTransforms(t *testing.T) {
transforms := NewEmpty()
assert.Equal(t, 20, cap(transforms))
}
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