Add tests for writing Java interface declarations

1 files changed, 10 insertions, 8 deletions

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
index 664c322..59de6b7 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriter.java
@@ -27,7 +27,7 @@ public class JavaWriter implements AutoCloseable {
         writeTypeDeclaration(compilationUnit.typeDeclaration());
     }
 
-    private void writeTypeDeclaration(JavaTypeDeclaration typeDeclaration) throws IOException {
+    void writeTypeDeclaration(JavaTypeDeclaration typeDeclaration) throws IOException {
         switch (typeDeclaration) {
             case JavaInterfaceDeclaration interfaceDeclaration -> {
                 writeInterfaceDeclaration(interfaceDeclaration);
@@ -44,13 +44,15 @@ public class JavaWriter implements AutoCloseable {
         this.writer.write(interfaceDeclaration.name());
         this.writer.write(" ");
 
-        writer.write("permits ");
-        writeWithSeparator(
-            interfaceDeclaration.permitsTypes(),
-            this::writeTypeRef,
-            () -> writer.write(", ")
-        );
-        writer.write(" ");
+        if (!interfaceDeclaration.permitsTypes().isEmpty()) {
+            writer.write("permits ");
+            writeWithSeparator(
+                interfaceDeclaration.permitsTypes(),
+                this::writeTypeRef,
+                () -> writer.write(", ")
+            );
+            writer.write(" ");
+        }
 
         this.writer.write("{");
         this.writer.newLine();