+
+cat > rootdir/usr/lib/apt/solvers/explicitremove << EOF
+#!/bin/sh
+set -e
+while read line; do
+ if [ "APT-ID" = "\${line%:*}" ]; then
+ cat << APT
+Install: \${line#*:}
+
+Remove: \${line#*:}
+
+APT
+ fi
+done
+EOF
+chmod +x rootdir/usr/lib/apt/solvers/explicitremove
+testfailure apt full-upgrade -s --solver explicitremove
+testsuccess grep 'had a previous stanza' rootdir/tmp/testfailure.output
+
+cat > rootdir/usr/lib/apt/solvers/removeall << EOF
+#!/bin/sh
+set -e
+while read line; do
+ if [ "APT-ID" = "\${line%:*}" ]; then
+ cat << APT
+Remove: \${line#*:}
+
+APT
+ fi
+done
+EOF
+chmod +x rootdir/usr/lib/apt/solvers/removeall
+testwarning apt full-upgrade -s --solver removeall
+testsuccess grep "which isn't installed!" rootdir/tmp/testwarning.output
+
+cat > rootdir/usr/lib/apt/solvers/installall << EOF
+#!/bin/sh
+set -e
+while read line; do
+ if [ "APT-ID" = "\${line%:*}" ]; then
+ cat << APT
+Install: \${line#*:}
+
+APT
+ fi
+done
+EOF
+chmod +x rootdir/usr/lib/apt/solvers/installall
+testfailure apt full-upgrade -s --solver installall
+testsuccess grep "is already installed!" rootdir/tmp/testfailure.output
+
+testsolverfailuremsg() {
+ local SOLVER="rootdir/usr/lib/apt/solvers/$1"
+ echo "$2" > "$SOLVER"
+ chmod +x "$SOLVER"
+ testfailuremsg "$3" apt full-upgrade -s --solver $1
+}
+
+testsolverfailuremsg 'exit0withmsg' "#!/bin/sh
+echo 'Error: instant-exit
+Message: This solver exits instantly'
+exit 0" 'E: External solver failed with: This solver exits instantly'
+
+testsolverfailuremsg 'exit1withoutmsg' "#!/bin/sh
+exit 1" 'E: Sub-process exit1withoutmsg returned an error code (1)'
+
+testsolverfailuremsg 'exit1withmsg' "#!/bin/sh
+echo 'Error: instant-exit
+Message: This solver exits instantly'
+exit 1" 'E: External solver failed with: This solver exits instantly
+E: Sub-process exit1withmsg returned an error code (1)'