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package buffer
import (
"fmt"
"testing"
"github.com/tdewolff/test"
)
func TestWriter(t *testing.T) {
w := NewWriter(make([]byte, 0, 3))
test.That(t, w.Len() == 0, "buffer must initially have zero length")
n, _ := w.Write([]byte("abc"))
test.That(t, n == 3, "first write must write 3 characters")
test.Bytes(t, w.Bytes(), []byte("abc"), "first write must match 'abc'")
test.That(t, w.Len() == 3, "buffer must have length 3 after first write")
n, _ = w.Write([]byte("def"))
test.That(t, n == 3, "second write must write 3 characters")
test.Bytes(t, w.Bytes(), []byte("abcdef"), "second write must match 'abcdef'")
w.Reset()
test.Bytes(t, w.Bytes(), []byte(""), "reset must match ''")
n, _ = w.Write([]byte("ghijkl"))
test.That(t, n == 6, "third write must write 6 characters")
test.Bytes(t, w.Bytes(), []byte("ghijkl"), "third write must match 'ghijkl'")
}
func ExampleNewWriter() {
w := NewWriter(make([]byte, 0, 11)) // initial buffer length is 11
w.Write([]byte("Lorem ipsum"))
fmt.Println(string(w.Bytes()))
// Output: Lorem ipsum
}
func ExampleWriter_Reset() {
w := NewWriter(make([]byte, 0, 11)) // initial buffer length is 10
w.Write([]byte("garbage that will be overwritten")) // does reallocation
w.Reset()
w.Write([]byte("Lorem ipsum"))
fmt.Println(string(w.Bytes()))
// Output: Lorem ipsum
}
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