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