Tests: Verify SLA in CPackComponentsForAll-DragNDrop-* DMG files

Issue: #20889

Tests/CPackComponentsForAll/RunCPackVerifyResult.cmake

@@ -88,12 +88,14 @@ if(CPackGen MATCHES "DragNDrop")
     set(expected_file_mask "${CPackComponentsForAll_BINARY_DIR}/MyLib-*.dmg")
     if(${CPackComponentWay} STREQUAL "default")
         set(expected_count 1)
+        set(expect_dmg_sla 1)
     elseif(${CPackComponentWay} STREQUAL "OnePackPerGroup")
         set(expected_count 3)
     elseif(${CPackComponentWay} STREQUAL "IgnoreGroup")
         set(expected_count 4)
     elseif(${CPackComponentWay} STREQUAL "AllInOne")
         set(expected_count 1)
+        set(expect_dmg_sla 1)
     endif()
 endif()
 
@@ -138,6 +140,20 @@ if(expected_file_mask)
   if(NOT actual_count EQUAL expected_count)
     message(FATAL_ERROR "error: expected_count=${expected_count} does not match actual_count=${actual_count}: CPackComponents test fails. (CPack_output=${CPack_output}, CPack_error=${CPack_error})")
   endif()
+
+  if(expect_dmg_sla)
+    execute_process(COMMAND hdiutil udifderez -xml "${expected_file}" OUTPUT_VARIABLE out ERROR_VARIABLE err RESULT_VARIABLE res)
+    if(NOT res EQUAL 0)
+      string(REPLACE "\n" "\n  " err "  ${err}")
+      message(FATAL_ERROR "error: running 'hdiutil udifderez -xml' on\n  ${expected_file}\nfailed with:\n${err}")
+    endif()
+    foreach(key "LPic" "STR#" "TEXT")
+      if(NOT out MATCHES "<key>${key}</key>")
+        string(REPLACE "\n" "\n  " out "  ${out}")
+        message(FATAL_ERROR "error: running 'hdiutil udifderez -xml' on\n  ${expected_file}\ndid not show '${key}' key:\n${out}")
+      endif()
+    endforeach()
+  endif()
 endif()
 
 # Validate content