Support (no-op) type substitution for struct types

1 files changed, 14 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/types/TypeSubstitutionTests.java b/src/test/java/org/shedlang/compiler/types/TypeSubstitutionTests.java
index e9b04a95..d6713ee0 100644
--- a/src/test/java/org/shedlang/compiler/types/TypeSubstitutionTests.java
+++ b/src/test/java/org/shedlang/compiler/types/TypeSubstitutionTests.java
@@ -154,6 +154,20 @@ public class TypeSubstitutionTests {
     }
 
     @Test
+    public void substitutingStructDoesNothing() {
+        var typeSubstitutionMap = TypeSubstitutionMap.of(
+            Map.entry(TypeParam.forStructType(STRUCT_TYPE, "T"), Types.INT)
+        );
+
+        var result = TypeSubstitution.substitute(
+            Types.struct(NamespaceName.of("A"), "B"),
+            typeSubstitutionMap
+        );
+
+        assertThat(result, equalTo(Types.struct(NamespaceName.of("A"), "B")));
+    }
+
+    @Test
     public void substitutingTopDoesNothing() {
         var typeSubstitutionMap = TypeSubstitutionMap.of(
             Map.entry(TypeParam.forStructType(STRUCT_TYPE, "T"), Types.INT)