tests/aux/common.sh: Add new function cmd_is()

1 files changed, 35 insertions, 1 deletions

diff --git a/tests/aux/common.sh b/tests/aux/common.sh
index fce9d07..0561b21 100644
--- a/tests/aux/common.sh
+++ b/tests/aux/common.sh
@@ -1,6 +1,6 @@
 # Functions common to tests
 #
-# Copyright (C) 2018 Patrick McDermott
+# Copyright (C) 2018, 2019 Patrick McDermott
 #
 # This file is part of opkbuild.
 #
@@ -33,3 +33,37 @@ is()
 		diag_ "    expected: '${expected}'"
 	fi
 }
+
+cmd_is()
+{
+	local description="${1}"
+	shift 1
+	local ok=
+	local eof=
+	local got=
+	local exp=
+
+	ok=true
+	exec 3<<-EOF
+		$("${@}")
+		EOF
+	while :; do
+		eof=0
+		read -r got <&3 || eof=$((${eof} + 1))
+		read -r exp <&0 || eof=$((${eof} + 2))
+		[ ${eof} -eq 3 ] && break
+		[ x"${got}" = x"${exp}" ] && continue
+		if ${ok}; then
+			not_ok_ -- "${description}"
+			diag_ " Failed test '${description}'"
+			ok=false
+		fi
+		diag_ "         got: '${got}'"
+		diag_ "    expected: '${exp}'"
+	done
+	exec 3<&-
+
+	if ${ok}; then
+		ok_ -- "${description}"
+	fi
+}