whatcanGOwrong

go/pkg/mod/github.com/mattn/go-runewidth@v0.0.13/runewidth_posix_test.go

@@ -0,0 +1,98 @@
+// +build !windows
+// +build !js
+// +build !appengine
+
+package runewidth
+
+import (
+	"os"
+	"testing"
+)
+
+type envVars struct {
+	lang     string
+	lc_all   string
+	lc_ctype string
+}
+
+func saveEnv() envVars {
+	return envVars{
+		lang:     os.Getenv("LANG"),
+		lc_all:   os.Getenv("LC_ALL"),
+		lc_ctype: os.Getenv("LC_CTYPE"),
+	}
+}
+func restoreEnv(env *envVars) {
+	os.Setenv("LANG", env.lang)
+	os.Setenv("LC_ALL", env.lc_all)
+	os.Setenv("LC_CTYPE", env.lc_ctype)
+}
+
+func TestIsEastAsian(t *testing.T) {
+	testcases := []struct {
+		locale string
+		want   bool
+	}{
+		{"foo@cjk_narrow", false},
+		{"foo@cjk", false},
+		{"utf-8@cjk", false},
+		{"ja_JP.CP932", true},
+	}
+
+	for _, tt := range testcases {
+		got := isEastAsian(tt.locale)
+		if got != tt.want {
+			t.Fatalf("isEastAsian(%q) should be %v", tt.locale, tt.want)
+		}
+	}
+}
+
+func TestIsEastAsianLCCTYPE(t *testing.T) {
+	env := saveEnv()
+	defer restoreEnv(&env)
+	os.Setenv("LC_ALL", "")
+
+	testcases := []struct {
+		lcctype string
+		want    bool
+	}{
+		{"ja_JP.UTF-8", true},
+		{"C", false},
+		{"POSIX", false},
+		{"en_US.UTF-8", false},
+	}
+
+	for _, tt := range testcases {
+		os.Setenv("LC_CTYPE", tt.lcctype)
+		got := IsEastAsian()
+		if got != tt.want {
+			t.Fatalf("IsEastAsian() for LC_CTYPE=%v should be %v", tt.lcctype, tt.want)
+		}
+	}
+}
+
+func TestIsEastAsianLANG(t *testing.T) {
+	env := saveEnv()
+	defer restoreEnv(&env)
+	os.Setenv("LC_ALL", "")
+	os.Setenv("LC_CTYPE", "")
+
+	testcases := []struct {
+		lcctype string
+		want    bool
+	}{
+		{"ja_JP.UTF-8", true},
+		{"C", false},
+		{"POSIX", false},
+		{"en_US.UTF-8", false},
+		{"C.UTF-8", false},
+	}
+
+	for _, tt := range testcases {
+		os.Setenv("LANG", tt.lcctype)
+		got := IsEastAsian()
+		if got != tt.want {
+			t.Fatalf("IsEastAsian() for LANG=%v should be %v", tt.lcctype, tt.want)
+		}
+	}
+}