github.com/dolthub/go-mysql-server@v0.18.0/sql/expression/function/length_test.go (about)

     1  // Copyright 2020-2021 Dolthub, 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 function
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/stretchr/testify/require"
    21  
    22  	"github.com/dolthub/go-mysql-server/sql"
    23  	"github.com/dolthub/go-mysql-server/sql/expression"
    24  	"github.com/dolthub/go-mysql-server/sql/types"
    25  )
    26  
    27  func TestLength(t *testing.T) {
    28  	testCases := []struct {
    29  		name      string
    30  		input     interface{}
    31  		inputType sql.Type
    32  		fn        func(sql.Expression) sql.Expression
    33  		expected  interface{}
    34  	}{
    35  		{
    36  			"length string",
    37  			"fóo",
    38  			types.Text,
    39  			NewLength,
    40  			int32(4),
    41  		},
    42  		{
    43  			"length binary",
    44  			[]byte("fóo"),
    45  			types.Blob,
    46  			NewLength,
    47  			int32(4),
    48  		},
    49  		{
    50  			"length empty",
    51  			"",
    52  			types.Blob,
    53  			NewLength,
    54  			int32(0),
    55  		},
    56  		{
    57  			"length empty binary",
    58  			[]byte{},
    59  			types.Blob,
    60  			NewLength,
    61  			int32(0),
    62  		},
    63  		{
    64  			"length nil",
    65  			nil,
    66  			types.Blob,
    67  			NewLength,
    68  			nil,
    69  		},
    70  		{
    71  			"char_length string",
    72  			"fóo",
    73  			types.LongText,
    74  			NewCharLength,
    75  			int32(3),
    76  		},
    77  		{
    78  			"char_length binary",
    79  			[]byte("fóo"),
    80  			types.Blob,
    81  			NewCharLength,
    82  			int32(4),
    83  		},
    84  		{
    85  			"char_length empty",
    86  			"",
    87  			types.Blob,
    88  			NewCharLength,
    89  			int32(0),
    90  		},
    91  		{
    92  			"char_length empty binary",
    93  			[]byte{},
    94  			types.Blob,
    95  			NewCharLength,
    96  			int32(0),
    97  		},
    98  		{
    99  			"char_length nil",
   100  			nil,
   101  			types.Blob,
   102  			NewCharLength,
   103  			nil,
   104  		},
   105  	}
   106  
   107  	for _, tt := range testCases {
   108  		t.Run(tt.name, func(t *testing.T) {
   109  			require := require.New(t)
   110  
   111  			result, err := tt.fn(expression.NewGetField(0, tt.inputType, "foo", false)).Eval(
   112  				sql.NewEmptyContext(),
   113  				sql.Row{tt.input},
   114  			)
   115  
   116  			require.NoError(err)
   117  			require.Equal(tt.expected, result)
   118  		})
   119  	}
   120  }