github.com/dolthub/go-mysql-server@v0.18.0/sql/expression/isnull_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 expression
    16  
    17  import (
    18  	"testing"
    19  
    20  	"github.com/dolthub/go-mysql-server/sql"
    21  	"github.com/dolthub/go-mysql-server/sql/types"
    22  
    23  	"github.com/stretchr/testify/require"
    24  )
    25  
    26  func TestIsNull(t *testing.T) {
    27  	require := require.New(t)
    28  
    29  	get0 := NewGetField(0, types.Text, "col1", true)
    30  	e := NewIsNull(get0)
    31  	require.Equal(types.Boolean, e.Type())
    32  	require.Equal(false, e.IsNullable())
    33  	require.Equal(true, eval(t, e, sql.NewRow(nil)))
    34  	require.Equal(false, eval(t, e, sql.NewRow("")))
    35  }