Cover LoadBalancer with tests (#1394)

Fixes #680. Fixes #1222.

src/util/Random.cpp

@@ -16,13 +16,21 @@
     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 //==============================================================================
+
 #include "util/Random.hpp"
 
 #include <chrono>
+#include <cstddef>
 #include <random>
 
 namespace util {
 
+void
+Random::setSeed(size_t seed)
+{
+    generator_.seed(seed);
+}
+
 std::mt19937_64 Random::generator_{std::chrono::system_clock::now().time_since_epoch().count()};
 
 }  // namespace util

src/util/Random.hpp

@@ -20,6 +20,7 @@
 
 #include "util/Assert.hpp"
 
+#include <cstddef>
 #include <random>
 
 namespace util {
@@ -50,6 +51,14 @@ public:
         return distribution(generator_);
     }
 
+    /**
+     * @brief Set the seed for the random number generator
+     *
+     * @param seed Seed to set
+     */
+    static void
+    setSeed(size_t seed);
+
 private:
     static std::mt19937_64 generator_;
 };