From f9fe80fa50e6ac0c3121c0dde6420c79973c4ccc Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 11 Jul 2026 15:47:22 +0100
Subject: Support options in Java transient-0

---
 .../java/org/zwobble/example/Transient0Tests.java  | 36 ++++++++++++++++++++++
 examples/10-transient-0/src/data.hob               |  5 +++
 2 files changed, 41 insertions(+)

(limited to 'examples/10-transient-0')

diff --git a/examples/10-transient-0/output/java-junit/src/test/java/org/zwobble/example/Transient0Tests.java b/examples/10-transient-0/output/java-junit/src/test/java/org/zwobble/example/Transient0Tests.java
index b7e841c..40acde4 100644
--- a/examples/10-transient-0/output/java-junit/src/test/java/org/zwobble/example/Transient0Tests.java
+++ b/examples/10-transient-0/output/java-junit/src/test/java/org/zwobble/example/Transient0Tests.java
@@ -4,6 +4,7 @@ import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.util.List;
+import java.util.Optional;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 import org.zwobble.example.types.data.HobgoblinTransient0Data;
@@ -13,6 +14,7 @@ import org.zwobble.example.types.data.StructWithBool;
 import org.zwobble.example.types.data.StructWithInt32;
 import org.zwobble.example.types.data.StructWithInt64;
 import org.zwobble.example.types.data.StructWithList;
+import org.zwobble.example.types.data.StructWithOption;
 import org.zwobble.example.types.data.StructWithString;
 
 public class Transient0Tests {
@@ -106,4 +108,38 @@ public class Transient0Tests {
 
         Assertions.assertEquals(value, decodedValue);
     }
+
+    @Test
+    public void structWithOptionNone() throws IOException {
+        var value = new StructWithOption(
+            Optional.empty(),
+            Optional.empty()
+        );
+
+        var outputStream = new ByteArrayOutputStream();
+        HobgoblinTransient0Data.encodeStructWithOption(value, outputStream);
+        var bytes = outputStream.toByteArray();
+
+        var inputStream = new ByteArrayInputStream(bytes);
+        var decodedValue = HobgoblinTransient0Data.decodeStructWithOption(inputStream);
+
+        Assertions.assertEquals(value, decodedValue);
+    }
+
+    @Test
+    public void structWithOptionSome() throws IOException {
+        var value = new StructWithOption(
+            Optional.of(10L),
+            Optional.of(new InnerStruct(42, 47))
+        );
+
+        var outputStream = new ByteArrayOutputStream();
+        HobgoblinTransient0Data.encodeStructWithOption(value, outputStream);
+        var bytes = outputStream.toByteArray();
+
+        var inputStream = new ByteArrayInputStream(bytes);
+        var decodedValue = HobgoblinTransient0Data.decodeStructWithOption(inputStream);
+
+        Assertions.assertEquals(value, decodedValue);
+    }
 }
diff --git a/examples/10-transient-0/src/data.hob b/examples/10-transient-0/src/data.hob
index 8550d6d..80ba8e5 100644
--- a/examples/10-transient-0/src/data.hob
+++ b/examples/10-transient-0/src/data.hob
@@ -32,3 +32,8 @@ struct StructWithList {
     field a: List[Int64];
     field b: List[InnerStruct];
 }
+
+struct StructWithOption {
+    field a: Option[Int64];
+    field b: Option[InnerStruct];
+}
-- 
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