From 39928746d5d65f74061aae83e0d1ace7b17a3bb3 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 13 Jun 2026 20:59:52 +0100
Subject: Parse fields in sum definition

---
 .../compiler/parser/ParserSumDefinitionTests.java  | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)

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

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserSumDefinitionTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserSumDefinitionTests.java
index 34b94fc..20de7ba 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserSumDefinitionTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserSumDefinitionTests.java
@@ -6,6 +6,9 @@ import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedSumDefinitionNode;
 import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedSumVariantDefinitionNode;
 import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeLevelReferenceNode;
 
+import static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNodeMatcher.isUntypedStructFieldDefinitionNode;
+import static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedSumDefinitionNodeMatcher.isUntypedSumDefinitionNode;
+import static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeLevelReferenceNodeMatcher.isUntypedTypeLevelReferenceNode;
 import static org.zwobble.hobgoblin.compiler.parser.ParserTesting.parseString;
 import static org.zwobble.precisely.AssertThat.assertThat;
 import static org.zwobble.precisely.Matchers.*;
@@ -81,6 +84,48 @@ public class ParserSumDefinitionTests {
         ));
     }
 
+    @Test
+    public void emptySumHasNoFields() {
+        var source = """
+            sum Shape {
+            }""";
+
+        var node = parseString(
+            source,
+            Parser::parseNamespaceStatement
+        );
+
+        assertThat(node, instanceOf(
+            UntypedSumDefinitionNode.class,
+            has("fields", UntypedSumDefinitionNode::fields, isSequence())
+        ));
+    }
+
+    @Test
+    public void sumWithFields() {
+        var source = """
+            sum Shape {
+                field height: Int32;
+                field width: Int64;
+            }""";
+
+        var node = parseString(
+            source,
+            Parser::parseNamespaceStatement
+        );
+
+        assertThat(node, isUntypedSumDefinitionNode()
+            .withFields(isSequence(
+                isUntypedStructFieldDefinitionNode()
+                    .withName(equalTo("height"))
+                    .withType(isUntypedTypeLevelReferenceNode().withName(equalTo("Int32"))),
+                isUntypedStructFieldDefinitionNode()
+                    .withName(equalTo("width"))
+                    .withType(isUntypedTypeLevelReferenceNode().withName(equalTo("Int64")))
+            ))
+        );
+    }
+
     @Test
     public void sumWithDocComment() {
         var source = """
-- 
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