github.com/dolthub/go-mysql-server@v0.18.0/sql/expression/function/reverse_repeat_replace_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 TestReverse(t *testing.T) {
    28  	f := NewReverse(expression.NewGetField(0, types.LongText, "", false))
    29  	testCases := []struct {
    30  		name     string
    31  		row      sql.Row
    32  		expected interface{}
    33  		err      bool
    34  	}{
    35  		{"null input", sql.NewRow(nil), nil, false},
    36  		{"empty string", sql.NewRow(""), "", false},
    37  		{"handles numbers as strings", sql.NewRow(123), "321", false},
    38  		{"valid string", sql.NewRow("foobar"), "raboof", false},
    39  	}
    40  	for _, tt := range testCases {
    41  		t.Run(tt.name, func(t *testing.T) {
    42  			t.Helper()
    43  			require := require.New(t)
    44  			ctx := sql.NewEmptyContext()
    45  
    46  			v, err := f.Eval(ctx, tt.row)
    47  			if tt.err {
    48  				require.Error(err)
    49  			} else {
    50  				require.NoError(err)
    51  				require.Equal(tt.expected, v)
    52  			}
    53  		})
    54  	}
    55  }
    56  
    57  func TestRepeat(t *testing.T) {
    58  	f := NewRepeat(
    59  		expression.NewGetField(0, types.LongText, "", false),
    60  		expression.NewGetField(1, types.Int32, "", false),
    61  	)
    62  
    63  	testCases := []struct {
    64  		name     string
    65  		row      sql.Row
    66  		expected interface{}
    67  		err      bool
    68  	}{
    69  		{"null input", sql.NewRow(nil), nil, false},
    70  		{"empty string", sql.NewRow("", 2), "", false},
    71  		{"count is zero", sql.NewRow("foo", 0), "", false},
    72  		{"count is negative", sql.NewRow("foo", -2), "foo", true},
    73  		{"valid string", sql.NewRow("foobar", 2), "foobarfoobar", false},
    74  	}
    75  	for _, tt := range testCases {
    76  		t.Run(tt.name, func(t *testing.T) {
    77  			t.Helper()
    78  			require := require.New(t)
    79  			ctx := sql.NewEmptyContext()
    80  
    81  			v, err := f.Eval(ctx, tt.row)
    82  			if tt.err {
    83  				require.Error(err)
    84  			} else {
    85  				require.NoError(err)
    86  				require.Equal(tt.expected, v)
    87  			}
    88  		})
    89  	}
    90  }
    91  
    92  func TestReplace(t *testing.T) {
    93  	f := NewReplace(
    94  		expression.NewGetField(0, types.LongText, "", false),
    95  		expression.NewGetField(1, types.LongText, "", false),
    96  		expression.NewGetField(2, types.LongText, "", false),
    97  	)
    98  
    99  	testCases := []struct {
   100  		name     string
   101  		row      sql.Row
   102  		expected interface{}
   103  		err      bool
   104  	}{
   105  		{"null inputs", sql.NewRow(nil), nil, false},
   106  		{"empty str", sql.NewRow("", "foo", "bar"), "", false},
   107  		{"empty fromStr", sql.NewRow("foobarfoobar", "", "car"), "foobarfoobar", false},
   108  		{"empty toStr", sql.NewRow("foobarfoobar", "bar", ""), "foofoo", false},
   109  		{"valid strings", sql.NewRow("foobarfoobar", "bar", "car"), "foocarfoocar", false},
   110  	}
   111  	for _, tt := range testCases {
   112  		t.Run(tt.name, func(t *testing.T) {
   113  			t.Helper()
   114  			require := require.New(t)
   115  			ctx := sql.NewEmptyContext()
   116  
   117  			v, err := f.Eval(ctx, tt.row)
   118  			if tt.err {
   119  				require.Error(err)
   120  			} else {
   121  				require.NoError(err)
   122  				require.Equal(tt.expected, v)
   123  			}
   124  		})
   125  	}
   126  }