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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

}

type testCase struct {

s []rune

glyphs int

}

var testCases = []testCase{

{[]rune("query"), 5},

{[]rune("私"), 2},

{[]rune("hello『世界』"), 13},

}

func TestCountGlyphs(t *testing.T) {

for _, testCase := range testCases {

count := countGlyphs(testCase.s)

if count != testCase.glyphs {

t.Errorf("ASCII count incorrect. %d != %d", count, testCase.glyphs)

}

count = countGlyphs(accent(testCase.s))

if count != testCase.glyphs {

t.Errorf("Accent count incorrect. %d != %d", count, testCase.glyphs)

}

}

}

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 _, testCase := range testCases {

for i := 0; i <= len(testCase.s); i++ {

iter := strconv.Itoa(i)

out := getPrefixGlyphs(testCase.s, i)

compare(out, testCase.s[:i], "ascii prefix "+iter, t)

out = getPrefixGlyphs(accent(testCase.s), i)

compare(out, accent(testCase.s[:i]), "accent prefix "+iter, t)

}

out := getPrefixGlyphs(testCase.s, 999)

compare(out, testCase.s, "ascii prefix overflow", t)

out = getPrefixGlyphs(accent(testCase.s), 999)

compare(out, accent(testCase.s), "accent prefix overflow", t)

out = getPrefixGlyphs(testCase.s, -3)

if len(out) != 0 {

t.Error("ascii prefix negative")

}

out = getPrefixGlyphs(accent(testCase.s), -3)

if len(out) != 0 {

t.Error("accent prefix negative")

}

}

}

func TestSuffixGlyphs(t *testing.T) {

for _, testCase := range testCases {

for i := 0; i <= len(testCase.s); i++ {

iter := strconv.Itoa(i)

out := getSuffixGlyphs(testCase.s, i)

compare(out, testCase.s[len(testCase.s)-i:], "ascii suffix "+iter, t)

out = getSuffixGlyphs(accent(testCase.s), i)

compare(out, accent(testCase.s[len(testCase.s)-i:]), "accent suffix "+iter, t)

}

out := getSuffixGlyphs(testCase.s, 999)

compare(out, testCase.s, "ascii suffix overflow", t)

out = getSuffixGlyphs(accent(testCase.s), 999)

compare(out, accent(testCase.s), "accent suffix overflow", t)

out = getSuffixGlyphs(testCase.s, -3)

if len(out) != 0 {

t.Error("ascii suffix negative")

}

out = getSuffixGlyphs(accent(testCase.s), -3)

if len(out) != 0 {

t.Error("accent suffix negative")

}

}

}