github.com/bazelbuild/rules_webtesting@v0.2.0/go/metadata/extension_test.go (about)

     1  // Copyright 2016 Google Inc.
     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  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package metadata
    16  
    17  import (
    18  	"fmt"
    19  	"reflect"
    20  	"testing"
    21  
    22  	"github.com/bazelbuild/rules_webtesting/go/bazel"
    23  )
    24  
    25  var extensionFile = "testdata/extension.json"
    26  
    27  func TestFromFileWithExtension(t *testing.T) {
    28  	f, err := bazel.Runfile(extensionFile)
    29  	if err != nil {
    30  		t.Fatal(err)
    31  	}
    32  	extension := &SampleExtension{}
    33  	_, err = FromFile(f, extension)
    34  	if err != nil {
    35  		t.Fatal(err)
    36  	}
    37  
    38  	expected := &SampleExtension{"hello", 512}
    39  
    40  	if !reflect.DeepEqual(extension, expected) {
    41  		t.Errorf("Got %#v, expected %#v", extension, expected)
    42  	}
    43  }
    44  
    45  func TestMergeWithExtension(t *testing.T) {
    46  	testCases := []struct {
    47  		name   string
    48  		input1 *Metadata
    49  		input2 *Metadata
    50  		result *Metadata // nil means it should return an error
    51  	}{
    52  		{
    53  			"Second empty",
    54  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    55  			&Metadata{},
    56  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    57  		},
    58  		{
    59  			"First empty",
    60  			&Metadata{},
    61  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    62  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    63  		},
    64  		{
    65  			"Different types",
    66  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    67  			&Metadata{Extension: &SampleExtension2{5}},
    68  			nil,
    69  		},
    70  		{
    71  			"Successful merge",
    72  			&Metadata{Extension: &SampleExtension{"hello", 1024}},
    73  			&Metadata{Extension: &SampleExtension{"goodbye", 2048}},
    74  			&Metadata{Extension: &SampleExtension{"hello", 2048}},
    75  		},
    76  	}
    77  
    78  	for _, tc := range testCases {
    79  		t.Run(tc.name, func(t *testing.T) {
    80  			a, err := Merge(tc.input1, tc.input2)
    81  
    82  			if err != nil {
    83  				if tc.result != nil {
    84  					t.Fatal(err)
    85  				}
    86  				return
    87  			}
    88  
    89  			if tc.result == nil {
    90  				t.Fatalf("Got %#v, expected error", a)
    91  			}
    92  
    93  			if !reflect.DeepEqual(a, tc.result) {
    94  				t.Fatalf("Got %#v, expected %#v", a, tc.result)
    95  			}
    96  		})
    97  	}
    98  }
    99  
   100  type SampleExtension struct {
   101  	ExtensionField1 string
   102  	ExtensionField2 int64
   103  }
   104  
   105  func (s *SampleExtension) Merge(other Extension) (Extension, error) {
   106  	if other == nil {
   107  		return s, nil
   108  	}
   109  	o, ok := other.(*SampleExtension)
   110  	if !ok {
   111  		return nil, fmt.Errorf("cannot merge %#v with %#v", s, other)
   112  	}
   113  	return &SampleExtension{
   114  		ExtensionField1: s.ExtensionField1,
   115  		ExtensionField2: o.ExtensionField2,
   116  	}, nil
   117  }
   118  
   119  func (s *SampleExtension) Normalize() error {
   120  	s.ExtensionField2 = s.ExtensionField2 / 2
   121  	return nil
   122  }
   123  
   124  type SampleExtension2 struct {
   125  	X int
   126  }
   127  
   128  func (s *SampleExtension2) Merge(other Extension) (Extension, error) {
   129  	return s, nil
   130  }
   131  
   132  func (s *SampleExtension2) Normalize() error {
   133  	return nil
   134  }