LibTest+Spreadsheet: Add some basic spreadsheet runtime behaviour tests

As there's a somewhat active development going on, let's keep the
expected behaviour under tests to make sure nothing blows up :^)

Meta/Lagom/CMakeLists.txt

@@ -625,6 +625,19 @@ if (BUILD_LAGOM)
         lagom_test(../../Tests/LibJS/test-invalid-unicode-js.cpp LIBS LagomJS)
         lagom_test(../../Tests/LibJS/test-bytecode-js.cpp LIBS LagomJS)
 
+        # Spreadsheet
+        add_executable(test-spreadsheet_lagom
+                ../../Tests/Spreadsheet/test-spreadsheet.cpp
+                ../../Userland/Libraries/LibTest/JavaScriptTestRunnerMain.cpp)
+        set_target_properties(test-spreadsheet_lagom PROPERTIES OUTPUT_NAME test-spreadsheet)
+        target_link_libraries(test-spreadsheet_lagom LagomCore LagomTest LagomJS)
+        add_test(
+                NAME Spreadsheet
+                COMMAND test-spreadsheet_lagom --show-progress=false
+        )
+        set_tests_properties(Spreadsheet PROPERTIES ENVIRONMENT SERENITY_SOURCE_DIR=${SERENITY_PROJECT_ROOT})
+
+
         # Markdown
         include(commonmark_spec)
         file(GLOB LIBMARKDOWN_TEST_SOURCES CONFIGURE_DEPENDS "../../Tests/LibMarkdown/*.cpp")

Meta/build-root-filesystem.sh

@@ -165,6 +165,7 @@ cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibCpp/Tests/parser mnt/home/ano
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibCpp/Tests/preprocessor mnt/home/anon/cpp-tests/preprocessor
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibWasm/Tests mnt/home/anon/wasm-tests
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibJS/Tests/test-common.js mnt/home/anon/wasm-tests
+cp -r "$SERENITY_SOURCE_DIR"/Userland/Applications/Spreadsheet/Tests mnt/home/anon/spreadsheet-tests
 
 if [ -n "$SERENITY_COPY_SOURCE" ] ; then
   printf "\ncopying Serenity's source... "