github.com/linchen2chris/hugo@v0.0.0-20230307053224-cec209389705/transform/chain_test.go (about)

     1  // Copyright 2018 The Hugo Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package transform
    15  
    16  import (
    17  	"bytes"
    18  	"strings"
    19  	"testing"
    20  
    21  	qt "github.com/frankban/quicktest"
    22  )
    23  
    24  func TestChainZeroTransformers(t *testing.T) {
    25  	tr := New()
    26  	in := new(bytes.Buffer)
    27  	out := new(bytes.Buffer)
    28  	if err := tr.Apply(in, out); err != nil {
    29  		t.Errorf("A zero transformer chain returned an error.")
    30  	}
    31  }
    32  
    33  func TestChainingMultipleTransformers(t *testing.T) {
    34  	f1 := func(ct FromTo) error {
    35  		_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f1"), []byte("f1r"), -1))
    36  		return err
    37  	}
    38  	f2 := func(ct FromTo) error {
    39  		_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f2"), []byte("f2r"), -1))
    40  		return err
    41  	}
    42  	f3 := func(ct FromTo) error {
    43  		_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f3"), []byte("f3r"), -1))
    44  		return err
    45  	}
    46  
    47  	f4 := func(ct FromTo) error {
    48  		_, err := ct.To().Write(bytes.Replace(ct.From().Bytes(), []byte("f4"), []byte("f4r"), -1))
    49  		return err
    50  	}
    51  
    52  	tr := New(f1, f2, f3, f4)
    53  
    54  	out := new(bytes.Buffer)
    55  	if err := tr.Apply(out, strings.NewReader("Test: f4 f3 f1 f2 f1 The End.")); err != nil {
    56  		t.Errorf("Multi transformer chain returned an error: %s", err)
    57  	}
    58  
    59  	expected := "Test: f4r f3r f1r f2r f1r The End."
    60  
    61  	if out.String() != expected {
    62  		t.Errorf("Expected %s got %s", expected, out.String())
    63  	}
    64  }
    65  
    66  func TestNewEmptyTransforms(t *testing.T) {
    67  	c := qt.New(t)
    68  	transforms := NewEmpty()
    69  	c.Assert(cap(transforms), qt.Equals, 20)
    70  }