Restore CommonUnitTestsPlaceholder (defines the MockCoordTrans target)

MockCoordTrans is a Release 2 GROUP3 target: a header-only static
library defined in Lts/Common/CommonUnitTestsPlaceholder/mocks. As a
header-only lib it has no source file as a ninja edge input, so the
build-closure keep set did not pull its dir in and the prune removed
its CMakeLists (ninja: unknown target MockCoordTrans). Restore the dir
and its add_subdirectory; the smoke tests inside stay behind their
default-OFF options.

qt6-after/qt6-migrated-legatus/Lts/Common/CMakeLists.txt

@@ -5,6 +5,8 @@
 #
 
 # Release 2 Common modules (S set: 15 modules)
+# Mock library for unit tests (CoordTrans mocks) — defines the MockCoordTrans target
+ADD_SUBDIRECTORY(CommonUnitTestsPlaceholder)
 ADD_SUBDIRECTORY(CodeGen)
 ADD_SUBDIRECTORY(LtsAppDescriptor)
 ADD_SUBDIRECTORY(LtsCommandLineParser)

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.16)
+project(CommonUnitTestsPlaceholder)
+
+include(FetchContent)
+
+option(BUILD_SMOKE_TESTS "Build QtTest smoke tests" OFF)
+option(BUILD_GTEST_SMOKE "Build GTest smoke tests" OFF)
+
+add_subdirectory(mocks)
+
+if(BUILD_SMOKE_TESTS)
+  if(NOT TARGET Qt6::Test)
+    find_package(Qt6 REQUIRED COMPONENTS Test)
+  endif()
+  add_executable(coordTransTests_smoke coordTransTests_smoke.cpp)
+  target_link_libraries(coordTransTests_smoke PRIVATE Qt6::Test MockCoordTrans::MockCoordTrans)
+  add_test(NAME coordTransTests_smoke COMMAND coordTransTests_smoke)
+endif()
+
+if(BUILD_GTEST_SMOKE)
+  find_package(GTest QUIET)
+  if(NOT GTest_FOUND)
+    FetchContent_Declare(
+      googletest
+      GIT_REPOSITORY https://github.com/google/googletest.git
+      GIT_TAG release-1.12.1
+    )
+    set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+    FetchContent_MakeAvailable(googletest)
+  endif()
+  add_executable(coordTransTests_gtest coordTransTests_gtest.cpp)
+  target_link_libraries(coordTransTests_gtest PRIVATE GTest::gtest_main MockCoordTrans::MockCoordTrans)
+  add_test(NAME coordTransTests_gtest COMMAND coordTransTests_gtest)
+endif()

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/coordTransTests_gtest.cpp

@@ -0,0 +1,11 @@
+// Stub GTest smoke test for coordTrans
+#include <gtest/gtest.h>
+
+TEST(CoordTransSmokeTest, StubTest) {
+    EXPECT_TRUE(true);
+}
+
+int main(int argc, char **argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return RUN_ALL_TESTS();
+}

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/coordTransTests_smoke.cpp

@@ -0,0 +1,14 @@
+// Stub QtTest smoke test for coordTrans
+#include <QTest>
+
+class CoordTransSmokeTest : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void stubTest() {
+        QVERIFY(true);
+    }
+};
+
+QTEST_APPLESS_MAIN(CoordTransSmokeTest)

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/mocks/CMakeLists.txt

@@ -0,0 +1,5 @@
+add_library(MockCoordTrans STATIC MockCoordTrans.h)
+target_include_directories(MockCoordTrans PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+# Export header-only semantics by providing an interface target
+add_library(MockCoordTrans::MockCoordTrans ALIAS MockCoordTrans)

qt6-after/qt6-migrated-legatus/Lts/Common/CommonUnitTestsPlaceholder/mocks/MockCoordTrans.h

@@ -0,0 +1,19 @@
+// MockCoordTrans.h - Stub mock for CoordTrans functionality
+// This is a placeholder to allow builds without full CoordTrans implementation
+
+#ifndef MOCK_COORD_TRANS_H
+#define MOCK_COORD_TRANS_H
+
+#include <QtCore/QString>
+#include <QtCore/QPointF>
+
+// Minimal stub to satisfy linker requirements
+namespace LtsCoordTrans {
+    // Placeholder types
+    struct UtmCoordinate {
+        static UtmCoordinate fromMgrs(const QString&) { return UtmCoordinate(); }
+        QPointF geographic() const { return QPointF(); }
+    };
+}
+
+#endif // MOCK_COORD_TRANS_H