github.com/Jeffail/benthos/v3@v3.65.0/public/service/interpolated_string_test.go (about)

     1  package service
     2  
     3  import (
     4  	"testing"
     5  
     6  	"github.com/stretchr/testify/assert"
     7  	"github.com/stretchr/testify/require"
     8  )
     9  
    10  func TestInterpolatedString(t *testing.T) {
    11  	tests := []struct {
    12  		name     string
    13  		expr     string
    14  		msg      *Message
    15  		expected string
    16  	}{
    17  		{
    18  			name:     "content interpolation",
    19  			expr:     `foo ${! content() } bar`,
    20  			msg:      NewMessage([]byte("hello world")),
    21  			expected: `foo hello world bar`,
    22  		},
    23  		{
    24  			name:     "no interpolation",
    25  			expr:     `foo bar`,
    26  			msg:      NewMessage([]byte("hello world")),
    27  			expected: `foo bar`,
    28  		},
    29  		{
    30  			name: "metadata interpolation",
    31  			expr: `foo ${! meta("var1") } bar`,
    32  			msg: func() *Message {
    33  				m := NewMessage([]byte("hello world"))
    34  				m.MetaSet("var1", "value1")
    35  				return m
    36  			}(),
    37  			expected: `foo value1 bar`,
    38  		},
    39  	}
    40  
    41  	for _, test := range tests {
    42  		t.Run(test.name, func(t *testing.T) {
    43  			i, err := NewInterpolatedString(test.expr)
    44  			require.NoError(t, err)
    45  			assert.Equal(t, test.expected, i.String(test.msg))
    46  			assert.Equal(t, test.expected, string(i.Bytes(test.msg)))
    47  		})
    48  	}
    49  }