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diff --git a/t/t0204-gettext-reencode-sanity.sh b/t/t0204-gettext-reencode-sanity.sh
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+++ b/t/t0204-gettext-reencode-sanity.sh
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+#!/bin/sh
+#
+# Copyright (c) 2010 Ævar Arnfjörð Bjarmason
+#
+
+test_description="Gettext reencoding of our *.po/*.mo files works"
+
+. ./lib-gettext.sh
+
+# The constants used in a tricky observation for undefined behaviour
+RUNES="TILRAUN: ᚻᛖ ᚳᚹᚫᚦ ᚦᚫᛏ ᚻᛖ ᛒᚢᛞᛖ ᚩᚾ ᚦᚫᛗ ᛚᚪᚾᛞᛖ ᚾᚩᚱᚦᚹᛖᚪᚱᛞᚢᛗ ᚹᛁᚦ ᚦᚪ ᚹᛖᛥᚫ"
+PUNTS="TILRAUN: ?? ???? ??? ?? ???? ?? ??? ????? ??????????? ??? ?? ????"
+MSGKEY="TEST: Old English Runes"
+
+test_expect_success GETTEXT_LOCALE 'gettext: Emitting UTF-8 from our UTF-8 *.mo files / Icelandic' '
+    printf "TILRAUN: Halló Heimur!" >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_locale" gettext "TEST: Hello World!" >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success GETTEXT_LOCALE 'gettext: Emitting UTF-8 from our UTF-8 *.mo files / Runes' '
+    printf "%s" "$RUNES" >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_locale" gettext "$MSGKEY" >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success GETTEXT_ISO_LOCALE 'gettext: Emitting ISO-8859-1 from our UTF-8 *.mo files / Icelandic' '
+    printf "TILRAUN: Halló Heimur!" | iconv -f UTF-8 -t ISO8859-1 >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_iso_locale" gettext "TEST: Hello World!" >actual &&
+    test_cmp expect actual
+'
+
+test_expect_success GETTEXT_ISO_LOCALE 'gettext: impossible ISO-8859-1 output' '
+	LANGUAGE=is LC_ALL="$is_IS_iso_locale" gettext "$MSGKEY" >runes &&
+	case "$(cat runes)" in
+	"$MSGKEY")
+		say "Your system gives back the key to message catalog"
+		;;
+	"$PUNTS")
+		say "Your system replaces an impossible character with ?"
+		;;
+	"$RUNES")
+		say "Your system gives back the raw message for an impossible request"
+		;;
+	*)
+		say "We never saw the error behaviour your system exhibits"
+		false
+		;;
+	esac
+'
+
+test_expect_success GETTEXT_LOCALE 'gettext: Fetching a UTF-8 msgid -> UTF-8' '
+    printf "TILRAUN: ‚einfaldar‘ og „tvöfaldar“ gæsalappir" >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_locale" gettext "TEST: ‘single’ and “double” quotes" >actual &&
+    test_cmp expect actual
+'
+
+# How these quotes get transliterated depends on the gettext implementation:
+#
+#   Debian:  ,einfaldar' og ,,tvöfaldar" [GNU libintl]
+#   FreeBSD: `einfaldar` og "tvöfaldar"  [GNU libintl]
+#   Solaris: ?einfaldar? og ?tvöfaldar?  [Solaris libintl]
+#
+# Just make sure the contents are transliterated, and don't use grep -q
+# so that these differences are emitted under --verbose for curious
+# eyes.
+test_expect_success GETTEXT_ISO_LOCALE 'gettext: Fetching a UTF-8 msgid -> ISO-8859-1' '
+    LANGUAGE=is LC_ALL="$is_IS_iso_locale" gettext "TEST: ‘single’ and “double” quotes" >actual &&
+    grep "einfaldar" actual &&
+    grep "$(echo tvöfaldar | iconv -f UTF-8 -t ISO8859-1)" actual
+'
+
+test_expect_success GETTEXT_LOCALE 'gettext.c: git init UTF-8 -> UTF-8' '
+    printf "Bjó til tóma Git lind" >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_locale" git init repo >actual &&
+    test_when_finished "rm -rf repo" &&
+    grep "^$(cat expect) " actual
+'
+
+test_expect_success GETTEXT_ISO_LOCALE 'gettext.c: git init UTF-8 -> ISO-8859-1' '
+    printf "Bjó til tóma Git lind" >expect &&
+    LANGUAGE=is LC_ALL="$is_IS_iso_locale" git init repo >actual &&
+    test_when_finished "rm -rf repo" &&
+    grep "^$(cat expect | iconv -f UTF-8 -t ISO8859-1) " actual
+'
+
+test_done