Add failing test for callNoReturn on undefined proc

test/unit/blocks_procedures.js

@@ -0,0 +1,28 @@
+const test = require('tap').test;
+const Procedures = require('../../src/blocks/scratch3_procedures');
+
+const blocks = new Procedures(null);
+
+test('getPrimitives', t => {
+    t.type(blocks.getPrimitives(), 'object');
+    t.end();
+});
+
+// Originally inspired by https://github.com/LLK/scratch-gui/issues/809
+test('calling a custom block with no definition does not throw', t => {
+    const args = {
+        mutation: {
+            proccode: 'undefined proc'
+        }
+    };
+    const util = {
+        getProcedureParamNames: () => null,
+        stackFrame: {
+            executed: false
+        }
+    };
+    t.doesNotThrow(() => {
+        blocks.callNoReturn(args, util);
+    });
+    t.end();
+});