diff --git a/spec/compiler/build_tables/item_set_transitions_spec.cc b/spec/compiler/build_tables/item_set_transitions_spec.cc
index dcaf6b0c..3ec84e1e 100644
--- a/spec/compiler/build_tables/item_set_transitions_spec.cc
+++ b/spec/compiler/build_tables/item_set_transitions_spec.cc
@@ -7,7 +7,7 @@ using namespace build_tables;
 
 START_TEST
 
-describe("item set transitions", []() {
+describe("lexical item set transitions", []() {
     PreparedGrammar grammar({}, {});
 
     describe("when two items in the set have transitions on the same character", [&]() {
@@ -29,4 +29,26 @@ describe("item set transitions", []() {
     });
 });
 
+describe("syntactic item set transitions", [&]() {
+    PreparedGrammar grammar({
+        { "A", blank() },
+        { "B", i_token(21) },
+    }, {});
+    
+    it("computes the closure of the new item sets", [&]() {
+        ParseItemSet set1({
+            ParseItem(Symbol(0), seq({ i_token(22), i_sym(1) }), 3, Symbol(23, SymbolOptionToken)),
+        });
+        
+        SymTransitions sym_transitions;
+        
+        AssertThat(sym_transitions(set1, grammar), Equals(map<Symbol, ParseItemSet>({
+            { Symbol(22, SymbolOptionToken), ParseItemSet({
+                ParseItem(Symbol(0), i_sym(1), 4, Symbol(23, SymbolOptionToken)),
+                ParseItem(Symbol(1), i_token(21), 0, Symbol(23, SymbolOptionToken))
+            }) },
+        })));
+    });
+});
+
 END_TEST
\ No newline at end of file