Add test for multiline strings in classes just to be safe.

Though the test isn't broken, just adding a multiline string within a class test case just out of an abundance of caution.

java/test/processing/mode/java/ParserTests.java

@@ -425,6 +425,11 @@ public class ParserTests {
     expectGood("multilinestr");
   }
 
+  @Test
+  public void testMultilineStringClass() {
+    expectGood("multilinestrclass");
+  }
+
   @Test
   public void testMultiMultilineString() {
     expectGood("multimultilinestr");