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path: root/Godeps/_workspace/src/github.com/peterh/liner/width_test.go
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package liner

import (
    "strconv"
    "testing"
)

func accent(in []rune) []rune {
    var out []rune
    for _, r := range in {
        out = append(out, r)
        out = append(out, '\u0301')
    }
    return out
}

var testString = []rune("query")

func TestCountGlyphs(t *testing.T) {
    count := countGlyphs(testString)
    if count != len(testString) {
        t.Errorf("ASCII count incorrect. %d != %d", count, len(testString))
    }
    count = countGlyphs(accent(testString))
    if count != len(testString) {
        t.Errorf("Accent count incorrect. %d != %d", count, len(testString))
    }
}

func compare(a, b []rune, name string, t *testing.T) {
    if len(a) != len(b) {
        t.Errorf(`"%s" != "%s" in %s"`, string(a), string(b), name)
        return
    }
    for i := range a {
        if a[i] != b[i] {
            t.Errorf(`"%s" != "%s" in %s"`, string(a), string(b), name)
            return
        }
    }
}

func TestPrefixGlyphs(t *testing.T) {
    for i := 0; i <= len(testString); i++ {
        iter := strconv.Itoa(i)
        out := getPrefixGlyphs(testString, i)
        compare(out, testString[:i], "ascii prefix "+iter, t)
        out = getPrefixGlyphs(accent(testString), i)
        compare(out, accent(testString[:i]), "accent prefix "+iter, t)
    }
    out := getPrefixGlyphs(testString, 999)
    compare(out, testString, "ascii prefix overflow", t)
    out = getPrefixGlyphs(accent(testString), 999)
    compare(out, accent(testString), "accent prefix overflow", t)

    out = getPrefixGlyphs(testString, -3)
    if len(out) != 0 {
        t.Error("ascii prefix negative")
    }
    out = getPrefixGlyphs(accent(testString), -3)
    if len(out) != 0 {
        t.Error("accent prefix negative")
    }
}

func TestSuffixGlyphs(t *testing.T) {
    for i := 0; i <= len(testString); i++ {
        iter := strconv.Itoa(i)
        out := getSuffixGlyphs(testString, i)
        compare(out, testString[len(testString)-i:], "ascii suffix "+iter, t)
        out = getSuffixGlyphs(accent(testString), i)
        compare(out, accent(testString[len(testString)-i:]), "accent suffix "+iter, t)
    }
    out := getSuffixGlyphs(testString, 999)
    compare(out, testString, "ascii suffix overflow", t)
    out = getSuffixGlyphs(accent(testString), 999)
    compare(out, accent(testString), "accent suffix overflow", t)

    out = getSuffixGlyphs(testString, -3)
    if len(out) != 0 {
        t.Error("ascii suffix negative")
    }
    out = getSuffixGlyphs(accent(testString), -3)
    if len(out) != 0 {
        t.Error("accent suffix negative")
    }
}