Add test block that breaks renderer.

tests/blocks/test_blocks.js

@@ -103,6 +103,30 @@ Blockly.defineBlocksWithJsonArray([  // BEGIN JSON EXTRACT
     "tooltip": "This is a JSON tooltip for the *block*.",
     "style": "math_blocks"
   },
+  {
+    "type": "test_basic_javascript",
+    "message0": "function %1(%2) { %3 %4 return %5 }",
+    "args0": [
+      "foo",
+      "args",
+      {
+        "type": "input_dummy"
+      },
+      {
+        "type": "input_statement",
+        "name": "STACK"
+      },
+      {
+        "type": "input_value",
+        "check": "number",
+        "align": "right",
+        "name": "RETURN"
+      }
+    ],
+    "inputsInline": true,
+    "colour": 200,
+    "tooltip": "Hello world."
+  },
   {
     "type": "test_dropdowns_long",
     "message0": "long: %1",

tests/playground.html

@@ -1274,6 +1274,7 @@ h1 {
       <block type="test_basic_value_to_statement"></block>
       <block type="test_basic_limit_instances"></block>
       <block type="test_basic_tooltips"></block>
+      <block type="test_basic_javascript"></block>
     </category>
     <category name="Drag">
       <label text="Drag each to the workspace"></label>