improve version and mirror updating

tests/version.bats

@@ -22,6 +22,10 @@ setup() {
   stub pacman 'grep "^$2 " <<< "$INSTALLED" || exit 1'
   stub checkupdates 'printf "%s" "$PENDING"; [ -n "$PENDING" ] || exit 2'
   export INSTALLED="mesa 1:26.2.6-1" PENDING=""
+  # The mirror synced $SYNCED_HOURS ago (an hour by default)
+  export MIRRORLIST="$BATS_TEST_TMPDIR/mirrorlist" SYNCED_HOURS=1
+  echo 'Server = https://mirror.example/archlinux/$repo/os/$arch' > "$MIRRORLIST"
+  stub curl 'echo "$(( $(date +%s) - SYNCED_HOURS * 3600 ))"'
 }
 
 @test "version shows the kernel and Mesa, with nothing newer to install" {
@@ -31,6 +35,7 @@ setup() {
   [[ "$output" == *"Kernel       9.9.1-arch1-1 (newer kernel installed, reboot to use it)"$'\n'* ]]
   [[ "$output" == *"Video driver Mesa 26.2.6"$'\n'* ]]
   [[ "$output" != *"is available"* ]]
+  [[ "$output" != *"mirror"* ]]
 }
 
 @test "version suggests update for a newer kernel and video driver" {
@@ -68,3 +73,19 @@ setup() {
   [[ "$output" == *"Kernel       9.9.1-arch1-1"* ]]
   [[ "$output" != *"is available"* ]]
 }
+
+@test "version warns when the package mirror is behind Arch" {
+  export SYNCED_HOURS=73
+  run bash "$CD/version"
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"Your package mirror (https://mirror.example/archlinux) last synced with Arch 3 days ago"* ]]
+  [[ "$output" == *"Run update"* ]]
+}
+
+@test "version doesn't warn about a mirror it can't reach" {
+  rm "$STUB_BIN/curl"
+  stub curl 'exit 7'
+  run bash "$CD/version"
+  [ "$status" -eq 0 ]
+  [[ "$output" != *"mirror"* ]]
+}