3 files changed, 75 insertions, 0 deletions
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/ast/typed/TypedNodeMatchers.java b/src/test/java/org/zwobble/hobgoblin/compiler/ast/typed/TypedNodeMatchers.java
new file mode 100644
index 0000000..bbf6a84
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/ast/typed/TypedNodeMatchers.java
@@ -0,0 +1,27 @@
+package org.zwobble.hobgoblin.compiler.ast.typed;
+
+import org.zwobble.hobgoblin.compiler.types.ConstructedNativeType;
+import org.zwobble.precisely.Matcher;
+
+import static org.zwobble.precisely.Matchers.*;
+
+public class TypedNodeMatchers {
+    private TypedNodeMatchers() {
+    }
+
+    public static Matcher<TypedTypeLevelExpressionNode<?>> isTypedConstructedTypeNode(
+        Matcher<ConstructedNativeType> value
+    ) {
+        return instanceOf(
+            TypedConstructedTypeNode.class,
+            has("value", TypedConstructedTypeNode::value, value)
+        );
+    }
+
+    public static Matcher<TypedTypeLevelExpressionNode<?>> isTypedTypeLevelReferenceNode(String name) {
+        return instanceOf(
+            TypedTypeLevelReferenceNode.class,
+            has("name", TypedTypeLevelReferenceNode::name, equalTo(name))
+        );
+    }
+}
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedArb.java b/src/test/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedArb.java
index 5a011d7..3943bc7 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedArb.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedArb.java
@@ -2,10 +2,23 @@ package org.zwobble.hobgoblin.compiler.ast.untyped;
 
 import org.zwobble.hobgoblin.compiler.sources.NullSource;
 
+import java.util.List;
+
 public class UntypedArb {
     private UntypedArb() {
     }
 
+    public static UntypedConstructedTypeNode constructedType(
+        UntypedTypeLevelExpressionNode receiver,
+        List<UntypedTypeLevelExpressionNode> args
+    ) {
+        return new UntypedConstructedTypeNode(
+            receiver,
+            args,
+            NullSource.INSTANCE
+        );
+    }
+
     public static UntypedTypeLevelReferenceNode typeLevelReference(String name) {
         return new UntypedTypeLevelReferenceNode(name, NullSource.INSTANCE);
     }
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerConstructedTypeTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerConstructedTypeTests.java
new file mode 100644
index 0000000..2fd1e91
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerConstructedTypeTests.java
@@ -0,0 +1,35 @@
+package org.zwobble.hobgoblin.compiler.typechecker;
+
+import org.junit.jupiter.api.Test;
+import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedArb;
+import org.zwobble.hobgoblin.compiler.types.*;
+
+import java.util.List;
+
+import static org.zwobble.hobgoblin.compiler.ast.typed.TypedNodeMatchers.isTypedConstructedTypeNode;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.equalTo;
+
+public class TypeCheckerConstructedTypeTests {
+    @Test
+    public void whenArgsMatchParamsThenCanConstructTypeFromTypeConstructor() {
+        var untyped = UntypedArb.constructedType(
+            UntypedArb.typeLevelReference("List"),
+            List.of(UntypedArb.typeLevelReference("Int32"))
+        );
+        var context = TypeCheckerContextArb.namespaceContext();
+        context.declare("List");
+        var listType = new SimpleNativeType("List");
+        var listTypeConstructor = new TypeConstructor<>(List.of(new TypeParam("T")), listType);
+        context.define("List", new TypeLevelValueType(listTypeConstructor));
+        context.declare("Int32");
+        var int32Type = new SimpleNativeType("Int32");
+        context.define("Int32", new TypeLevelValueType(int32Type));
+
+        var typed = TypeChecker.typeCheckTypeLevelExpression(untyped, context);
+
+        assertThat(typed, isTypedConstructedTypeNode(
+            equalTo(new ConstructedNativeType(listTypeConstructor, List.of(int32Type)))
+        ));
+    }
+}