[CI] Link the version string and RNG stub into the test targets

The distribution libgtest.a now used by the Linux images makes the linker
pull more translation units out of libcockatrice_network than the fetched
googletest did. Those units reference VERSION_STRING and the global rng,
which several test targets never defined, so the instrumented Ubuntu 26.04
legs failed at link:

  undefined reference to `VERSION_STRING'
  undefined reference to `rng'

Add the generated version string source wherever a test links the network
umbrella, and define the rng stub in the tests that pull the server game
classes without declaring it. This matches what the neighbouring server
tests already do.

A full Debug build and ctest suite in the ci-ubuntu2604 image (system
libgtest.a) is green: 841 tests pass.

Fixes the nightly failures introduced by #6894.

tests/CMakeLists.txt

@@ -300,6 +300,7 @@ cockatrice_add_test(
   NAME
   server_card_counter_test
   SOURCES
+  ${VERSION_STRING_CPP}
   server_card_counter_test.cpp
   LIBS
   libcockatrice_network
@@ -310,6 +311,7 @@ cockatrice_add_test(
   NAME
   server_dump_zone_test
   SOURCES
+  ${VERSION_STRING_CPP}
   server_dump_zone_test.cpp
   LIBS
   libcockatrice_rng
@@ -321,6 +323,7 @@ cockatrice_add_test(
   NAME
   server_counter_test
   SOURCES
+  ${VERSION_STRING_CPP}
   server_counter_test.cpp
   LIBS
   libcockatrice_network
@@ -332,6 +335,7 @@ cockatrice_add_test(
   server_developer_role_test
   NO_SANITIZE
   SOURCES
+  ${VERSION_STRING_CPP}
   server_developer_role_test.cpp
   LIBS
   libcockatrice_network
@@ -344,6 +348,7 @@ cockatrice_add_test(
   server_moderator_role_test
   NO_SANITIZE
   SOURCES
+  ${VERSION_STRING_CPP}
   server_moderator_role_test.cpp
   LIBS
   libcockatrice_network
@@ -390,6 +395,7 @@ cockatrice_add_test(
   NAME
   local_client_lifetime_test
   SOURCES
+  ${VERSION_STRING_CPP}
   local_client_lifetime_test.cpp
   LIBS
   libcockatrice_network
@@ -411,6 +417,7 @@ cockatrice_add_test(
   NAME
   latency_tracker_test
   SOURCES
+  ${VERSION_STRING_CPP}
   latency_tracker_test.cpp
   LIBS
   libcockatrice_network

tests/client_login_status_test.cpp

@@ -13,6 +13,10 @@
 #include <QMetaObject>
 #include <QString>
 #include <gtest/gtest.h>
+#include <libcockatrice/rng/rng_abstract.h>
+
+// Referenced by other translation units in the server_remote library.
+RNG_Abstract *rng = nullptr;
 
 namespace
 {

tests/server_dump_zone_test.cpp

@@ -7,8 +7,12 @@
 #include <climits>
 #include <gtest/gtest.h>
 #include <libcockatrice/network/server/remote/game/dump_zone_range.h>
+#include <libcockatrice/rng/rng_abstract.h>
 #include <vector>
 
+// Referenced by other translation units in the server_remote library.
+RNG_Abstract *rng = nullptr;
+
 namespace
 {
 /// Indices a dump request resolves to, as the handler would walk them.

tests/theme_migration/theme_migration_test.cpp

@@ -9,12 +9,16 @@
 #include <QStringLiteral>
 #include <QTemporaryDir>
 #include <gtest/gtest.h>
+#include <libcockatrice/rng/rng_abstract.h>
 #include <string>
 
 // Owned by main.cpp in the real application; pixel_map_generator.cpp references
 // it, so the test binary needs a definition even though it never renders.
 ThemeManager *themeManager = nullptr;
 
+// Referenced by other translation units in the server_remote library.
+RNG_Abstract *rng = nullptr;
+
 namespace
 {
 const QString LEGACY = QStringLiteral("Default");