From 8e3727afb7145eb9e1a72ffa148b0c133a1eaeef Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 11 Jul 2026 15:59:25 +0100
Subject: Extract assertRoundTripEncoding()

---
 .../java/org/zwobble/example/Transient0Tests.java  | 117 +++++++++++----------
 1 file changed, 59 insertions(+), 58 deletions(-)

(limited to 'examples')

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 40acde4..cb3ac61 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
@@ -3,6 +3,8 @@ package org.zwobble.example;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.util.List;
 import java.util.Optional;
 import org.junit.jupiter.api.Assertions;
@@ -22,70 +24,55 @@ public class Transient0Tests {
     public void structWithBool() throws IOException {
         var value = new StructWithBool(true, false);
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithBool(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithBool(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithBool,
+            HobgoblinTransient0Data::decodeStructWithBool
+        );
     }
 
     @Test
     public void structWithInt32() throws IOException {
         var value = new StructWithInt32(10, 25);
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithInt32(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithInt32(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithInt32,
+            HobgoblinTransient0Data::decodeStructWithInt32
+        );
     }
 
     @Test
     public void structWithInt64() throws IOException {
         var value = new StructWithInt64(10, 25);
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithInt64(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithInt64(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithInt64,
+            HobgoblinTransient0Data::decodeStructWithInt64
+        );
     }
 
     @Test
     public void structWithString() throws IOException {
         var value = new StructWithString("abc", "def");
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithString(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithString(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithString,
+            HobgoblinTransient0Data::decodeStructWithString
+        );
     }
 
     @Test
     public void nestedStruct() throws IOException {
         var value = new OuterStruct(new InnerStruct(10, 25), 42);
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeOuterStruct(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeOuterStruct(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeOuterStruct,
+            HobgoblinTransient0Data::decodeOuterStruct
+        );
     }
 
     @Test
@@ -99,14 +86,11 @@ public class Transient0Tests {
             )
         );
 
-        var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithList(value, outputStream);
-        var bytes = outputStream.toByteArray();
-
-        var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithList(inputStream);
-
-        Assertions.assertEquals(value, decodedValue);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithList,
+            HobgoblinTransient0Data::decodeStructWithList
+        );
     }
 
     @Test
@@ -116,14 +100,11 @@ public class Transient0Tests {
             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);
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithOption,
+            HobgoblinTransient0Data::decodeStructWithOption
+        );
     }
 
     @Test
@@ -133,13 +114,33 @@ public class Transient0Tests {
             Optional.of(new InnerStruct(42, 47))
         );
 
+        assertRoundTripEncoding(
+            value,
+            HobgoblinTransient0Data::encodeStructWithOption,
+            HobgoblinTransient0Data::decodeStructWithOption
+        );
+    }
+
+    private <T> void assertRoundTripEncoding(
+        T value,
+        Encoder<T> encoder,
+        Decoder<T> decoder
+    ) throws IOException {
         var outputStream = new ByteArrayOutputStream();
-        HobgoblinTransient0Data.encodeStructWithOption(value, outputStream);
+        encoder.encode(value, outputStream);
         var bytes = outputStream.toByteArray();
 
         var inputStream = new ByteArrayInputStream(bytes);
-        var decodedValue = HobgoblinTransient0Data.decodeStructWithOption(inputStream);
+        var decodedValue = decoder.decode(inputStream);
 
         Assertions.assertEquals(value, decodedValue);
     }
+
+    private interface Encoder<T> {
+        void encode(T value, OutputStream outputStream) throws IOException;
+    }
+
+    private interface Decoder<T> {
+        T decode(InputStream inputStream) throws IOException;
+    }
 }
-- 
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