@@ -5,6 +5,81 @@ import (

 	"testing"

 )

+func TestFixedBufferCap(t *testing.T) {

+	buf := &fixedBuffer{buf: make([]byte, 0, 5)}

+

+	n := buf.Cap()

+	if n != 5 {

+		t.Fatalf("expected buffer capacity to be 5 bytes, got %d", n)

+	}

+}

+

+func TestFixedBufferLen(t *testing.T) {

+	buf := &fixedBuffer{buf: make([]byte, 0, 10)}

+

+	buf.Write([]byte("hello"))

+	l := buf.Len()

+	if l != 5 {

+		t.Fatalf("expected buffer length to be 5 bytes, got %d", l)

+	}

+

+	buf.Write([]byte("world"))

+	l = buf.Len()

+	if l != 10 {

+		t.Fatalf("expected buffer length to be 10 bytes, got %d", l)

+	}

+

+	// read 5 bytes

+	b := make([]byte, 5)

+	buf.Read(b)

+

+	l = buf.Len()

+	if l != 5 {

+		t.Fatalf("expected buffer length to be 5 bytes, got %d", l)

+	}

+

+	n, err := buf.Write([]byte("i-wont-fit"))

+	if n != 0 {

+		t.Fatalf("expected no bytes to be written to buffer, got %d", n)

+	}

+	if err != errBufferFull {

+		t.Fatalf("expected errBufferFull, got %v", err)

+	}

+

+	l = buf.Len()

+	if l != 5 {

+		t.Fatalf("expected buffer length to still be 5 bytes, got %d", l)

+	}

+

+	buf.Reset()

+	l = buf.Len()

+	if l != 0 {

+		t.Fatalf("expected buffer length to still be 0 bytes, got %d", l)

+	}

+}

+

+func TestFixedBufferString(t *testing.T) {

+	buf := &fixedBuffer{buf: make([]byte, 0, 10)}

+

+	buf.Write([]byte("hello"))

+	buf.Write([]byte("world"))

+

+	out := buf.String()

+	if out != "helloworld" {

+		t.Fatalf("expected output to be \"helloworld\", got %q", out)

+	}

+

+	// read 5 bytes

+	b := make([]byte, 5)

+	buf.Read(b)

+

+	// test that fixedBuffer.String() only returns the part that hasn't been read

+	out = buf.String()

+	if out != "world" {

+		t.Fatalf("expected output to be \"world\", got %q", out)

+	}

+}

+

 func TestFixedBufferWrite(t *testing.T) {

 	buf := &fixedBuffer{buf: make([]byte, 0, 64)}

 	n, err := buf.Write([]byte("hello"))