Fix meta.ini duplicate keys and SKSE Log Redirector mapped folders

meta.ini: Qt6 QSettings IniFormat is case-sensitive on Linux. Pre-existing
CamelCase keys + lowercase setValue() left both casings in the file, so
mods grew duplicate entries on every install. Added MetaIniUtils::
normalizeMetaIniCase() to fold keys to lowercase and dedupe per-section
(keeping non-empty values) before any QSettings open in readMeta,
saveMeta, doInstall, and createMod.

SKSE Log Redirector: deployExternalMappings created per-file symlinks
under the redirected destination, so any new log file the game wrote
post-deploy ended up as a real file outside the mapping. For
isDirectory && createTarget mappings, now publish a single directory
symlink dst -> src when the destination is missing, an existing symlink,
or empty. Falls back to per-file symlinks when dst already has real
content (preserves user data). Cleanup removes the symlink, leaving no
files behind.

Tests under src/tests/ (gtest, opt-in via BUILD_TESTING):
- test_metainiutils: 6 tests covering no-op cases, case-only dedup,
  multi-line continuations, per-section scoping, and end-to-end
  verification that QSettings duplication is fixed.
- test_external_dir_mapping: 6 tests covering directory symlink deploy,
  flow-through writes, idempotency, empty-dir replacement, real-file
  fallback, and cleanup.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
new file mode 100644
index 0000000..8e71366
--- /dev/null
+++ b/src/tests/CMakeLists.txt
@@ -0,0 +1,53 @@
+cmake_minimum_required(VERSION 3.16)
+
+find_package(Qt6 REQUIRED COMPONENTS Core)
+find_package(GTest REQUIRED)
+
+# ---------------------------------------------------------------------------
+# meta.ini case-normalization helper tests
+# ---------------------------------------------------------------------------
+add_executable(test_metainiutils EXCLUDE_FROM_ALL
+    test_metainiutils.cpp
+    ${CMAKE_SOURCE_DIR}/src/src/metainiutils.cpp
+)
+set_target_properties(test_metainiutils PROPERTIES
+    AUTOMOC OFF
+    CXX_STANDARD 23
+    CXX_STANDARD_REQUIRED ON
+)
+target_include_directories(test_metainiutils PRIVATE
+    ${CMAKE_SOURCE_DIR}/src/src
+)
+target_link_libraries(test_metainiutils PRIVATE
+    Qt6::Core
+    GTest::gtest
+    GTest::gtest_main
+)
+add_test(NAME test_metainiutils COMMAND test_metainiutils)
+
+# ---------------------------------------------------------------------------
+# External directory mapping (SKSE Log Redirector style) tests
+#
+# Exercises the deploy/cleanup logic for `isDirectory && createTarget`
+# mappings — directory-symlink path plus the per-file fallback when the
+# destination already has real content. The behavior is mirrored from
+# FuseConnector::deployExternalMappings so the test can run without
+# bringing in libfuse or the rest of the organizer dependency tree.
+# ---------------------------------------------------------------------------
+add_executable(test_external_dir_mapping EXCLUDE_FROM_ALL
+    test_external_dir_mapping.cpp
+)
+set_target_properties(test_external_dir_mapping PROPERTIES
+    AUTOMOC OFF
+    CXX_STANDARD 23
+    CXX_STANDARD_REQUIRED ON
+)
+target_link_libraries(test_external_dir_mapping PRIVATE
+    GTest::gtest
+    GTest::gtest_main
+)
+add_test(NAME test_external_dir_mapping COMMAND test_external_dir_mapping)
+
+# Register a "fluorine-tests" umbrella target that builds every test exe.
+add_custom_target(fluorine-tests
+    DEPENDS test_metainiutils test_external_dir_mapping)