Add tests for additional day 12 examples

include/aoc/GardenGroups.hpp

@@ -25,6 +25,7 @@ class GardenGroups
     : public LinesSolver
 {
 public:
+    GardenGroups(const int inputFileNameSuffix = 0);
     virtual const std::string getPuzzleName() const override;
     virtual const int getPuzzleDay() const override;
     virtual void finish() override;

include/aoc/LinesSolver.hpp

@@ -24,6 +24,7 @@ class LinesSolver
     : public Solver
 {
 public:
+    LinesSolver(const int inputFileNameSuffix = 0);
     virtual void processDataLine(const std::string& line) override;
 protected:
     std::vector<std::string> lines{};