test for interface calls

src/de/inetsoftware/jwebassembly/module/WasmCallInterfaceInstruction.java

@@ -58,6 +58,6 @@ class WasmCallInterfaceInstruction extends WasmCallInstruction {
      * {@inheritDoc}
      */
     public void writeTo( @Nonnull ModuleWriter writer ) throws IOException {
-        throw new WasmException( "Interface calls not supported", getLineNumber() );
+        throw new WasmException( "Interface calls are not supported.", getLineNumber() );
     }
 }

test/de/inetsoftware/jwebassembly/runtime/RuntimeErrors.java

@@ -19,7 +19,9 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -111,4 +113,18 @@ public class RuntimeErrors {
             run.run();
         }
     }
+
+
+    @Test
+    public void interfaceCall() throws IOException {
+        compileErrorTest( "Interface calls are not supported.", InterfaceMethod.class );
+    }
+
+    static class InterfaceMethod {
+        @Export
+        static int runnable() {
+            List list = new ArrayList();
+            return list.size();
+        }
+    }
 }