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package rope
import (
"bytes"
"errors"
"testing"
"github.com/bruth/assert"
)
func TestLeaf(t *testing.T) {
v := leaf("foo")
assert.Equal(t, depthT(0), v.depth())
assert.Equal(t, int64(3), v.length())
assert.Equal(t, v, v.slice(0, v.length()))
assert.Equal(t, v, v.slice(-100, 100))
assert.Equal(t, leaf("f"), v.slice(0, 1))
assert.Equal(t, leaf("f"), v.slice(-100, 1))
assert.Equal(t, leaf("o"), v.slice(2, v.length()))
assert.Equal(t, leaf(""), v.slice(2, 1))
assert.Equal(t, v, v.dropPrefix(0))
assert.Equal(t, v, v.dropPrefix(-100))
assert.Equal(t, leaf("oo"), v.dropPrefix(1))
assert.Equal(t, leaf(""), v.dropPrefix(3))
assert.Equal(t, leaf(""), v.dropPrefix(100))
assert.Equal(t, v, v.dropPostfix(3))
assert.Equal(t, v, v.dropPostfix(100))
assert.Equal(t, leaf("fo"), v.dropPostfix(2))
assert.Equal(t, leaf(""), v.dropPostfix(0))
assert.Equal(t, leaf(""), v.dropPostfix(-100))
buf := bytes.NewBuffer(nil)
_, _ = v.WriteTo(buf)
assert.Equal(t, "foo", buf.String())
counter := 0
err := v.walkLeaves(func(l string) error {
if counter > 0 {
t.Errorf("leaf.walkLeaves: function called too many times")
return errors.New("called a lot")
}
counter++
assert.Equal(t, string(v), l)
return nil
})
assert.Nil(t, err)
}
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