1 files changed, 45 insertions, 0 deletions
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.*;
@@ -82,6 +85,48 @@ 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 = """
             /// A 2D shape.