diff --git a/tests/test-rebuild.sh b/tests/test-rebuild.sh
new file mode 100755
index 0000000..f7f475b
--- /dev/null
+++ b/tests/test-rebuild.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+
+# for testing updates to ghc-rpm-macros etc
+# In a pkg dir run
+#   $ ./test-rebuild.sh
+# or clone a pkg branch:
+#   $ ./test-rebuild.sh [pkg] [branch]
+
+set -e
+
+PKG=${1:-$(fedpkg gimmespec | sed -e "s/.spec//")}
+
+[ -d "$PKG" -o -f "$PKG.spec" ] || fedpkg clone -a $PKG
+
+[ -d "$PKG" ] && cd $PKG
+
+ARCH=$(arch)
+
+#if [ -d $ARCH ]; then
+#  echo Please move existing $ARCH/
+#  exit 1
+#fi
+
+if [ -n "$2" ]; then
+  fedpkg switch-branch $2
+fi
+
+sudo yum-builddep $PKG.spec
+
+fedpkg local
+
+VERREL=$(fedpkg verrel | sed -e "s/^$PKG-//")
+
+TMP=test-tmp
+
+mkdir -p $TMP/
+
+PKGS=$(cd $ARCH; rpm -qp $(ls *-$VERREL*.rpm))
+
+for i in $PKGS; do
+  # FIXME: should check NVR is same before building
+  rpm -q --quiet $i || sudo yum install -q $i
+  for k in list requires provides scripts; do
+    rpm -qp --$k $ARCH/$i.rpm | grep -v rpmlib > $TMP/$i.$k.test || :
+    rpm -q --$k $i | grep -v rpmlib > $TMP/$i.$k.installed || :
+    diff -u $TMP/$i.$k.installed $TMP/$i.$k.test || :
+  done
+done