From e49744ff95e24ad4282c29634fa58a4241c66c82 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 28 Apr 2026 23:43:29 +0100
Subject: Type check sum definitions

---
 .../typechecker/TypeCheckerSumDefinitionTests.java | 77 ++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerSumDefinitionTests.java

(limited to 'src/test/java/org')

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerSumDefinitionTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerSumDefinitionTests.java
new file mode 100644
index 0000000..18d718e
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/typechecker/TypeCheckerSumDefinitionTests.java
@@ -0,0 +1,77 @@
+package org.zwobble.hobgoblin.compiler.typechecker;
+
+import org.junit.jupiter.api.Test;
+import org.zwobble.hobgoblin.compiler.ast.typed.*;
+import org.zwobble.hobgoblin.compiler.ast.untyped.*;
+import org.zwobble.hobgoblin.compiler.sources.NullSource;
+import org.zwobble.hobgoblin.compiler.types.*;
+
+import java.util.List;
+
+import static org.zwobble.hobgoblin.compiler.typechecker.TypeCheckerTesting.typeCheckNamespaceStatement;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.*;
+
+public class TypeCheckerSumDefinitionTests {
+    @Test
+    public void sumHasNamespaceFromContext() {
+        var untyped = new UntypedSumDefinitionNode(
+            "X",
+            List.of(),
+            NullSource.INSTANCE
+        );
+        var context = TypeCheckerContextArb.namespaceContext(NamespaceName.of("a", "b"));
+
+        var typed = typeCheckNamespaceStatement(untyped, context);
+
+        assertThat(typed, instanceOf(
+            TypedSumDefinitionNode.class,
+            has(
+                "type",
+                TypedSumDefinitionNode::type,
+                equalTo(new SumType(NamespaceName.of("a", "b"), "X"))
+            )
+        ));
+    }
+
+    @Test
+    public void variantsAreTypeChecked() {
+        var rectangleType = new StructType(NamespaceName.of("a", "b"), "Rectangle");
+        var triangleType = new StructType(NamespaceName.of("a", "b"), "Triangle");
+        var untyped = new UntypedSumDefinitionNode(
+            "X",
+            List.of(
+                new UntypedSumVariantDefinitionNode(UntypedArb.typeLevelReference("Rectangle"), NullSource.INSTANCE),
+                new UntypedSumVariantDefinitionNode(UntypedArb.typeLevelReference("Triangle"), NullSource.INSTANCE)
+            ),
+            NullSource.INSTANCE
+        );
+        var context = TypeCheckerContextArb.namespaceContext(NamespaceName.of("a", "b"));
+        context.declare(rectangleType.name());
+        context.define(rectangleType.name(), new TypeLevelValueType(rectangleType));
+        context.declare(triangleType.name());
+        context.define(triangleType.name(), new TypeLevelValueType(triangleType));
+
+        var typed = typeCheckNamespaceStatement(untyped, context);
+
+        assertThat(typed, instanceOf(
+            TypedSumDefinitionNode.class,
+            has(
+                "fields",
+                TypedSumDefinitionNode::variants,
+                isSequence(
+                    has("type", TypedSumVariantDefinitionNode::type, has(
+                        "value",
+                        TypedTypeLevelExpressionNode::value,
+                        equalTo(rectangleType)
+                    )),
+                    has("type", TypedSumVariantDefinitionNode::type, has(
+                        "value",
+                        TypedTypeLevelExpressionNode::value,
+                        equalTo(triangleType)
+                    ))
+                )
+            )
+        ));
+    }
+}
-- 
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