Basic LR(1) but not LALR(1) test

tests/CMakeLists.txt

@@ -1,5 +1,6 @@
 add_executable(Parsodus-test
     lr0_shift-red.cpp
+    lr1_only.cpp
     )
 target_link_libraries(Parsodus-test
     # Parsodus-backends

tests/lr1_only.cpp

@@ -0,0 +1,47 @@
+#include "Parsodus/lrtables/generator.h"
+#include "Parsodus/lrtables/LR1Itemset.h"
+#include "Parsodus/lrtables/LALR1Itemset.h"
+#include "gtest/gtest.h"
+
+#include <memory>
+
+TEST(lr1, only) {
+    using namespace pds;
+
+	Grammar grammar;
+	grammar.start = "s";
+	grammar.variables = {"s","a","b"};
+	grammar.terminals = {"A", "B"};
+
+    for (const std::pair<std::string, std::vector<std::string>>& p : std::initializer_list<std::pair<std::string, std::vector<std::string>>>({
+                {"s", {"B", "a", "A"}},
+                {"s", {"b", "A"}},
+                {"s", {"a"}},
+                {"s", {"B", "b"}},
+                {"a", {"A"}},
+                {"b", {"A"}}
+            })) {
+        auto r = std::make_shared<Rule>();
+        r->head = p.first;
+        r->tail = p.second;
+        grammar.rules.emplace_back(std::move(r));
+    }
+
+    {
+        pds::lr::Generator<lr::LR1Itemset> g(grammar);
+        ASSERT_NO_THROW(g.generate());
+    }
+
+    {
+        pds::lr::Generator<pds::lr::LALR1Itemset> g(grammar);
+        ASSERT_THROW(g.generate(), std::runtime_error);
+        try {
+            g.generate();
+        } catch (std::runtime_error& e) {
+            ASSERT_EQ(std::string("reduce-reduce"), e.what());
+        }
+    }
+}
+
+
+