dsmiley commented on a change in pull request #1877:
URL: https://github.com/apache/lucene-solr/pull/1877#discussion_r492226769



##########
File path: 
solr/core/src/test/org/apache/solr/request/macro/TestMacroExpander.java
##########
@@ -143,15 +142,31 @@ public void testMapExprExpandOn() {
     String oldVal = System.getProperty("StreamingExpressionMacros","false");
     System.setProperty("StreamingExpressionMacros", "true");
     try {
-      @SuppressWarnings({"rawtypes"})
-      Map expanded = MacroExpander.expand(request);
-      assertEquals("zero", ((String[])expanded.get("fq"))[0]);
-      assertEquals("one", ((String[])expanded.get("fq"))[1]);
-      assertEquals("two", ((String[]) expanded.get("fq"))[2]);
-      assertEquals("three", ((String[]) expanded.get("fq"))[3]);
-      assertEquals("one", ((String[])expanded.get("expr"))[0]);
+      Map<String, String[]> expanded = MacroExpander.expand(request);
+      assertEquals("zero", expanded.get("fq")[0]);
+      assertEquals("one", expanded.get("fq")[1]);
+      assertEquals("two", expanded.get("fq")[2]);
+      assertEquals("three", expanded.get("fq")[3]);
+      assertEquals("one", expanded.get("expr")[0]);
     } finally {
       System.setProperty("StreamingExpressionMacros", oldVal);
     }
   }
+
+  @Test
+  public void testUnbalanced() { // SOLR-13181
+    final MacroExpander meSkipOnMissingParams = new 
MacroExpander(Collections.emptyMap());
+    final MacroExpander meFailOnMissingParams = new 
MacroExpander(Collections.emptyMap(), true);
+    assertEquals("${noClose", meSkipOnMissingParams.expand("${noClose"));

Review comment:
       I'm not 100% clear what you suggest; let me try to guess.  Let's say the 
parameter map has exactly one param == goodAnswer with value 42.
   ````
       assertEquals("42", meSkipOnMissingParams.expand("${goodAnswer}"));
       assertEquals("42", meFailOnMissingParams.expand("${goodAnswer}"));
   ````
   Is that what you suggest?




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