Add ASTSymbolTableBuilder tests

tests/CMakeLists.txt

@@ -3,6 +3,7 @@ set(EXECUTABLE_OUTPUT_PATH ${PUGS_BINARY_DIR})
 
 add_executable (unit_tests
   test_main.cpp
+  test_ASTSymbolTableBuilder.cpp
   test_ASTBuilder.cpp
   test_Array.cpp
   test_ArrayUtils.cpp

tests/test_ASTSymbolTableBuilder.cpp

+#include <catch2/catch.hpp>
+
+#include <ASTBuilder.hpp>
+#include <ASTSymbolTableBuilder.hpp>
+
+TEST_CASE("ASTSymbolTableBuilder", "[language]")
+{
+  SECTION("Build symbols")
+  {
+    std::string_view data = R"(
+N n = 2;
+{
+ N m = n;
+ R n = m/3.;
+}
+)";
+
+    string_input input{data, "test.pgs"};
+    auto ast = ASTBuilder::build(input);
+
+    ASTSymbolTableBuilder{*ast};
+  }
+
+  SECTION("Undeclared symbol")
+  {
+    std::string_view data = R"(
+N n = a;
+)";
+
+    string_input input{data, "test.pgs"};
+    auto ast = ASTBuilder::build(input);
+
+    REQUIRE_THROWS_AS(ASTSymbolTableBuilder{*ast}, parse_error);
+  }
+
+  SECTION("Re-declared symbol")
+  {
+    std::string_view data = R"(
+N n = 0;
+N n = 1;
+)";
+
+    string_input input{data, "test.pgs"};
+    auto ast = ASTBuilder::build(input);
+
+    REQUIRE_THROWS_AS(ASTSymbolTableBuilder{*ast}, parse_error);
+  }
+}