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package llb
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestScratchMerge(t *testing.T) {
t.Parallel()
s := Merge(nil)
require.Nil(t, s.Output())
s = Merge([]State{})
require.Nil(t, s.Output())
s = Merge([]State{Scratch()})
require.Nil(t, s.Output())
s = Merge([]State{Scratch(), Scratch()})
require.Nil(t, s.Output())
input := Image("foo")
s = Merge([]State{input})
require.Equal(t, input.Output(), s.Output())
s = Merge([]State{Scratch(), input, Scratch()})
require.Equal(t, input.Output(), s.Output())
s = Merge([]State{Scratch(), input, Image("bar")})
require.NotEqual(t, input.Output(), s.Output())
}
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