Add a unit test

tests/Makefile.am

@@ -39,7 +39,8 @@ src_TESTS = \
   basic-flags.sh \
   set-empty-rpath.sh \
   phdr-corruption.sh \
-  replace-needed.sh
+  replace-needed.sh \
+  replace-add-needed.sh
 
 build_TESTS = \
   $(no_rpath_arch_TESTS)

tests/replace-add-needed.sh

@@ -0,0 +1,34 @@
+#! /bin/sh -e
+SCRATCH=scratch/$(basename $0 .sh)
+PATCHELF=$(readlink -f "../src/patchelf")
+
+rm -rf ${SCRATCH}
+mkdir -p ${SCRATCH}
+
+cp simple ${SCRATCH}/
+cp libfoo.so ${SCRATCH}/
+cp libbar.so ${SCRATCH}/
+
+
+pushd ${SCRATCH}
+
+libcldd=$(ldd ./simple | grep -oP "(?<=libc.so.6 => )[^ ]+")
+
+# We have to set the soname on these libraries
+${PATCHELF} --set-soname libbar.so ./libbar.so
+
+# Add a libbar.so so we can rewrite it later
+${PATCHELF} --add-needed libbar.so ./simple
+
+${PATCHELF} --replace-needed libc.so.6 ${libcldd} \
+            --replace-needed libbar.so $(readlink -f ./libbar.so) \
+            --add-needed $(readlink -f ./libfoo.so) \
+            ./simple
+
+exitCode=0
+./simple || exitCode=$?
+
+if test "$exitCode" != 0; then
+    ldd ./simple
+    exit 1
+fi