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|
package buffruneio
import (
"strings"
"testing"
)
func assumeRunesArray(t *testing.T, expected []rune, got []rune) {
if len(expected) != len(got) {
t.Fatal("expected", len(expected), "runes, but got", len(got))
}
for i := 0; i < len(got); i++ {
if expected[i] != got[i] {
t.Fatal("expected rune", expected[i], "at index", i, "but got", got[i])
}
}
}
func assumeRune(t *testing.T, rd *Reader, r rune) {
gotRune, err := rd.ReadRune()
if err != nil {
t.Fatal("unexpected error", err)
}
if gotRune != r {
t.Fatal("got", string(gotRune),
"(", []byte(string(gotRune)), ")",
"expected", string(r),
"(", []byte(string(r)), ")")
}
}
func TestReadString(t *testing.T) {
s := "hello"
rd := NewReader(strings.NewReader(s))
assumeRune(t, rd, 'h')
assumeRune(t, rd, 'e')
assumeRune(t, rd, 'l')
assumeRune(t, rd, 'l')
assumeRune(t, rd, 'o')
assumeRune(t, rd, EOF)
}
func TestMultipleEOF(t *testing.T) {
s := ""
rd := NewReader(strings.NewReader(s))
assumeRune(t, rd, EOF)
assumeRune(t, rd, EOF)
}
func TestUnread(t *testing.T) {
s := "ab"
rd := NewReader(strings.NewReader(s))
assumeRune(t, rd, 'a')
assumeRune(t, rd, 'b')
rd.UnreadRune()
assumeRune(t, rd, 'b')
assumeRune(t, rd, EOF)
}
func TestUnreadEOF(t *testing.T) {
s := ""
rd := NewReader(strings.NewReader(s))
rd.UnreadRune()
assumeRune(t, rd, EOF)
assumeRune(t, rd, EOF)
rd.UnreadRune()
assumeRune(t, rd, EOF)
}
func TestForget(t *testing.T) {
s := "hello"
rd := NewReader(strings.NewReader(s))
assumeRune(t, rd, 'h')
assumeRune(t, rd, 'e')
assumeRune(t, rd, 'l')
assumeRune(t, rd, 'l')
rd.Forget()
if rd.UnreadRune() != ErrNoRuneToUnread {
t.Fatal("no rune should be available")
}
}
func TestForgetEmpty(t *testing.T) {
s := ""
rd := NewReader(strings.NewReader(s))
rd.Forget()
assumeRune(t, rd, EOF)
rd.Forget()
}
func TestPeekEmpty(t *testing.T) {
s := ""
rd := NewReader(strings.NewReader(s))
runes := rd.Peek(1)
if len(runes) != 1 {
t.Fatal("incorrect number of runes", len(runes))
}
if runes[0] != EOF {
t.Fatal("incorrect rune", runes[0])
}
}
func TestPeek(t *testing.T) {
s := "a"
rd := NewReader(strings.NewReader(s))
runes := rd.Peek(1)
assumeRunesArray(t, []rune{'a'}, runes)
runes = rd.Peek(1)
assumeRunesArray(t, []rune{'a'}, runes)
assumeRune(t, rd, 'a')
runes = rd.Peek(1)
assumeRunesArray(t, []rune{EOF}, runes)
assumeRune(t, rd, EOF)
}
func TestPeekLarge(t *testing.T) {
s := "abcdefg"
rd := NewReader(strings.NewReader(s))
runes := rd.Peek(100)
if len(runes) != len(s)+1 {
t.Fatal("incorrect number of runes", len(runes))
}
assumeRunesArray(t, []rune{'a', 'b', 'c', 'd', 'e', 'f', 'g', EOF}, runes)
}
|
