From c80835cf60e3d772152fd1873dde76d41fa6cec2 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 11 Jul 2026 15:42:04 +0100
Subject: Make initializer optional for local variables in Java

---
 .../compiler/output/lang/java/JavaWriterTests.java | 25 ++++++++++++++++++++++
 .../ast/JavaLocalVariableDeclarationMatcher.java   |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)

(limited to 'src/test/java')

diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
index 508321e..f768827 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
@@ -1034,6 +1034,31 @@ public class JavaWriterTests {
         assertThat(string, equalTo("var count = 42;"));
     }
 
+    @Test
+    public void localVariableDeclarationWithInitializer() throws IOException {
+        var java = JavaLocalVariableDeclaration.arbitrary()
+            .withName(JavaIdentifier.of("count"))
+            .withInitializer(new JavaIntegerLiteral(42))
+            .build();
+
+        var string = write(writer -> writer.writeBlockStatement(java));
+
+        assertThat(string, equalTo("var count = 42;"));
+    }
+
+    @Test
+    public void localVariableDeclarationWithoutInitializer() throws IOException {
+        var java = JavaLocalVariableDeclaration.arbitrary()
+            .withType(JavaTypeRef.INT)
+            .withName(JavaIdentifier.of("count"))
+            .withInitializer(Optional.empty())
+            .build();
+
+        var string = write(writer -> writer.writeBlockStatement(java));
+
+        assertThat(string, equalTo("int count;"));
+    }
+
     // === Returns ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLocalVariableDeclarationMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLocalVariableDeclarationMatcher.java
index d36db60..a39fcd2 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLocalVariableDeclarationMatcher.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLocalVariableDeclarationMatcher.java
@@ -40,7 +40,7 @@ public class JavaLocalVariableDeclarationMatcher implements org.zwobble.precisel
         return new org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclarationMatcher(submatchers);
     }
 
-    public org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclarationMatcher withInitializer(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaExpression> initializer) {
+    public org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclarationMatcher withInitializer(org.zwobble.precisely.Matcher<? super java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaExpression>> initializer) {
         var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclaration>>(this.submatchers);
         submatchers.add(org.zwobble.precisely.Matchers.has("initializer", org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclaration::initializer, initializer));
         return new org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLocalVariableDeclarationMatcher(submatchers);
-- 
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