Submodule update triggers tasks when task.subupdates is set

tests/git.bats

@@ -204,3 +204,20 @@ function setup_submodule {
     [[ "$TIME" = "$NEWTIME" ]]
 }
 
+@test "submodule update triggers task when task.subupdates is set" {
+    setup_submodule
+    touch $FORGEBUILDDIR/time.subupdates
+    $FORGEBUILD -b $FORGEBUILDDIR time
+    [ -f /tmp/forgebuild-time ]
+    TIME="$(cat /tmp/forgebuild-time)"
+
+    cd $SUBMODULE
+    echo "new stuff" > NEWFILE
+    git add NEWFILE
+    git commit -m "second commit"
+
+    $FORGEBUILD -b $FORGEBUILDDIR time
+    NEWTIME="$(cat /tmp/forgebuild-time)"
+
+    [[ "$TIME" != "$NEWTIME" ]]
+}