Add missing test for DataVariant

tests/test_DataVariant.cpp

@@ -11,11 +11,12 @@ TEST_CASE("DataVariant", "[language]")
 {
   SECTION("AggregateDataVariant")
   {
-    AggregateDataVariant aggregate{std::vector<DataVariant>{double{1.3}, int64_t{-3}, std::vector<double>{1, 2.7}}};
+    AggregateDataVariant aggregate{
+      std::vector<DataVariant>{double{1.3}, int64_t{-3}, std::vector<double>{1, 2.7}, bool{true}}};
 
     SECTION("size")
     {
-      REQUIRE(aggregate.size() == 3);
+      REQUIRE(aggregate.size() == 4);
     }
 
     SECTION("output")
@@ -24,7 +25,8 @@ TEST_CASE("DataVariant", "[language]")
       aggregate_output << aggregate;
 
       std::stringstream expected_output;
-      expected_output << '(' << double{1.3} << ", " << int64_t{-3} << ", (" << 1 << ", " << 2.7 << "))";
+      expected_output << '(' << double{1.3} << ", " << int64_t{-3} << ", (" << 1 << ", " << 2.7 << "), "
+                      << std::boolalpha << true << ")";
       REQUIRE(aggregate_output.str() == expected_output.str());
     }