1 files changed, 82 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
new file mode 100644
index 0000000..825511e
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserSumDefinitionTests.java
@@ -0,0 +1,82 @@
+package org.zwobble.hobgoblin.compiler.parser;
+
+import org.junit.jupiter.api.Test;
+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.parser.ParserTesting.parseString;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.*;
+
+public class ParserSumDefinitionTests {
+    @Test
+    public void nameIsParsed() {
+        var source = """
+            sum Shape {
+            }""";
+
+        var node = parseString(
+            source,
+            Parser::parseNamespaceStatement
+        );
+
+        assertThat(node, instanceOf(
+            UntypedSumDefinitionNode.class,
+            has("name", UntypedSumDefinitionNode::name, equalTo("Shape"))
+        ));
+    }
+
+    @Test
+    public void emptySumHasNoVariants() {
+        var source = """
+            sum Shape {
+            }""";
+
+        var node = parseString(
+            source,
+            Parser::parseNamespaceStatement
+        );
+
+        assertThat(node, instanceOf(
+            UntypedSumDefinitionNode.class,
+            has("variants", UntypedSumDefinitionNode::variants, isSequence())
+        ));
+    }
+
+    @Test
+    public void sumWithVariants() {
+        var source = """
+            sum Shape {
+                variant Rectangle;
+                variant Triangle;
+            }""";
+
+        var node = parseString(
+            source,
+            Parser::parseNamespaceStatement
+        );
+
+        assertThat(node, instanceOf(
+            UntypedSumDefinitionNode.class,
+            has("variants", UntypedSumDefinitionNode::variants, isSequence(
+                has(
+                    "type",
+                    UntypedSumVariantDefinitionNode::type,
+                    instanceOf(
+                        UntypedTypeLevelReferenceNode.class,
+                        has("name", UntypedTypeLevelReferenceNode::name, equalTo("Rectangle"))
+                    )
+                ),
+                has(
+                    "type",
+                    UntypedSumVariantDefinitionNode::type,
+                    instanceOf(
+                        UntypedTypeLevelReferenceNode.class,
+                        has("name", UntypedTypeLevelReferenceNode::name, equalTo("Triangle"))
+                    )
+                )
+            ))
+        ));
+    }
+}