netshovel/gapstring/gapstring_test.go

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package gapstring
import (
"bytes"
"testing"
)
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func assertEqual(t *testing.T, name string, a, b interface{}) {
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if a != b {
t.Errorf("%s: %#v != %#v", name, a, b)
}
}
func TestChunk(t *testing.T) {
var c chunk
c = chunk{gap: 2}
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assertEqual(t, "gap chunk", c.length(), 2)
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c = chunk{data: []byte("moo")}
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assertEqual(t, "byte chunk", c.length(), 3)
assertEqual(t, "byte slice", string(c.slice(1,3).data), "oo")
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}
func TestGapString(t *testing.T) {
g := GapString{}
if 0 != bytes.Compare(g.Bytes(), []byte{}) {
t.Errorf("%#v.Bytes() != []byte{}", g)
}
if g.Length() != 0 {
t.Errorf("len(%#v) != 0", g)
}
g = g.Append(g)
if g.Length() != 0 {
t.Errorf("Appending two emtpy gapstrings")
}
g = g.AppendString("moo")
if 0 != bytes.Compare(g.Bytes(), []byte("moo")) {
t.Errorf("Simple string")
}
g = g.AppendString("bar")
if g.String("") != "moobar" {
t.Errorf("Append")
}
if g.Missing() != 0 {
t.Errorf("Missing when there shouldn't be any missing")
}
g = g.AppendGap(8)
if g.Length() != 3+3+8 {
t.Errorf("Length after gap append")
}
if g.Missing() != 8 {
t.Errorf("Gap miscounted")
}
g = g.AppendString("baz")
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assertEqual(t, "string", g.String(""), "moobarbaz")
assertEqual(t, "string drop", g.String("DROP"), "moobarOPDROPDRbaz")
assertEqual(t, "xor", g.Xor(1).String(""), "lnnc`sc`{")
assertEqual(t, "xor drop", g.Xor(1).String("DROP"), "lnnc`sOPDROPDRc`{")
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assertEqual(t, "slice", g.Slice(2, 5).String(""), "oba")
assertEqual(t, "slice+xor", g.Slice(2, 5).Xor(1).String(""), "nc`")
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hexdump :=
"00000000 6d 6f 6f 62 61 72 -- -- -- -- -- -- -- -- 62 61 moobar<61><72><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ba\n" +
"00000010 7a z\n" +
"00000011\n"
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assertEqual(t, "hexdump", g.Hexdump(), hexdump)
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}