2 files changed, 30 insertions, 1 deletions
diff --git a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
index 3cfcd33..81c5b78 100644
--- a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
+++ b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
@@ -326,7 +326,25 @@ public class CsharpSerializer implements NodeVisitor {
 
     @Override
     public void visit(InterfaceNode interfaceNode) {
-        throw new UnsupportedOperationException();
+        // TODO: factor out duplication with visit(ClassNode)
+        writer.writeStatement(() -> {
+            writer.writeKeyword("namespace");
+            writer.writeSpace();
+            writer.writeIdentifier(interfaceNode.getName().getPackage().get());
+            writer.startBlock();
+            writer.writeStatement(() -> {
+                writer.writeKeyword("internal");
+                writer.writeSpace();
+                writer.writeKeyword("interface");
+                writer.writeSpace();
+                writer.writeIdentifier(interfaceNode.getName().getSimpleName());
+                writer.startBlock();
+                writeAll(interfaceNode.getMethods());
+                writer.endBlock();
+            });
+
+            writer.endBlock();
+        });
     }
 
     private void writeStaticConstructor(ClassNode classNode) {
diff --git a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
index 635afca..95df6e4 100644
--- a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
@@ -13,6 +13,7 @@ import static org.zwobble.couscous.ast.ExpressionStatementNode.expressionStateme
 import static org.zwobble.couscous.ast.FieldAccessNode.fieldAccess;
 import static org.zwobble.couscous.ast.FormalArgumentNode.formalArg;
 import static org.zwobble.couscous.ast.IfStatementNode.ifStatement;
+import static org.zwobble.couscous.ast.InterfaceNode.declareInterface;
 import static org.zwobble.couscous.ast.LiteralNode.literal;
 import static org.zwobble.couscous.ast.LocalVariableDeclarationNode.localVariableDeclaration;
 import static org.zwobble.couscous.ast.MethodCallNode.methodCall;
@@ -25,6 +26,7 @@ import static org.zwobble.couscous.ast.VariableDeclaration.var;
 import static org.zwobble.couscous.ast.VariableReferenceNode.reference;
 import static org.zwobble.couscous.ast.WhileNode.whileLoop;
 import static org.zwobble.couscous.util.ExtraLists.list;
+import static org.zwobble.couscous.util.ExtraSets.set;
 
 public class CsharpSerializerTests {
     @Test
@@ -301,6 +303,15 @@ public class CsharpSerializerTests {
         assertEquals("namespace com.example {\n    internal class Example {\n        internal static X x;\n        internal Y y;\n    }\n}\n", output);
     }
 
+    @Test
+    public void interfaceIsInNamespace() {
+        Node node = declareInterface(TypeName.of("com.example.Example"), set(), list());
+
+        String output = serialize(node);
+
+        assertEquals("namespace com.example {\n    internal interface Example {\n    }\n}\n", output);
+    }
+
     private String serialize(Node node) {
         return CsharpSerializer.serialize(node);
     }