[CI] Post install tests

.github/workflows/root-ci.yml

@@ -442,6 +442,11 @@ jobs:
         CONTAINER_IMAGE: "registry.cern.ch/root-ci/${{ matrix.image }}:buildready" #KEEP IN SYNC WITH ABOVE
         CONTAINER_OPTIONS: "--security-opt label=disable --rm ${{ matrix.property == 'gpu' && '--device nvidia.com/gpu=all' || '' }}" #KEEP IN SYNC WITH ABOVE
 
+    env:
+      BUILD_DIR: /github/home/ROOT-CI/build
+      INSTALL_DIR: /github/home/ROOT-CI/install
+      POST_INSTALL_DIR: /github/home/ROOT-CI/PostInstall
+
     steps:
       - name: Configure large ccache
         if: ${{ matrix.is_special }}
@@ -586,6 +591,18 @@ jobs:
         run: |
           ccache -s || true
 
+      - name: Install
+        run: "cmake --install ${{ env.BUILD_DIR }} --prefix ${{ env.INSTALL_DIR }}"
+
+      - name: Build post-install test project
+        run: |
+          cmake -S test/PostInstall/ -B ${{ env.POST_INSTALL_DIR }} -DCMAKE_PREFIX_PATH=${{ env.INSTALL_DIR }};
+          cmake --build ${{ env.POST_INSTALL_DIR }};
+
+      - name: CTest in post-install test project
+        working-directory: ${{ env.POST_INSTALL_DIR }}
+        run: ctest -j $(nproc)
+
   event_file:
     # For any event that is not a PR, the CI will always run. In PRs, the CI
     # can be skipped if the tag [skip-ci] or [skip ci] is written in the title.

test/PostInstall/CMakeLists.txt

@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
+
+project(PostInstall)
+
+find_package(ROOT REQUIRED)
+
+add_executable(readHSimple readHSimple.cxx)
+target_link_libraries(readHSimple PUBLIC ROOT::Hist ROOT::RIO)
+
+include(CTest)
+
+if(BUILD_TESTING)
+  add_test(NAME run-hsimple
+    COMMAND ${ROOT_BINDIR}/root.exe -b -q -l -e ".x ${CMAKE_SOURCE_DIR}/../../tutorials/hsimple.C" -e "return"
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  add_test(NAME read-hsimple
+    COMMAND $<TARGET_FILE:readHSimple>
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  set_tests_properties(run-hsimple   PROPERTIES FIXTURES_SETUP    HSIMPLE)
+  set_tests_properties(read-hsimple  PROPERTIES FIXTURES_REQUIRED HSIMPLE)
+endif()

test/PostInstall/readHSimple.cxx

@@ -0,0 +1,19 @@
+#include <TH1.h>
+#include <TFile.h>
+
+int main()
+{
+   TFile file("hsimple.root", "READ");
+   if (!file.IsOpen())
+      return 1;
+
+   TH1 *histo = file.Get<TH1>("hpx");
+   if (!histo)
+      return 2;
+
+   if (histo->GetEntries() != 25000)
+      return 3;
+   histo->Print();
+
+   return 0;
+}