fix: Test actually indented failures in JPPParserTest

Lines which aren't comments are identified beforehand and thus never
passed to this JPP parser. Fortunately, the comments suggest the intend
which the new test cases should now implement.

Author: ibbem

src/test/java/JPPParserTest.java

@@ -85,13 +85,13 @@ private static List<JPPParserTest.ThrowingTestCase> throwingTestCases() {
 
                 // Empty formula
                 new JPPParserTest.ThrowingTestCase("//#if"),
-                new JPPParserTest.ThrowingTestCase("#if defined()"),
-                new JPPParserTest.ThrowingTestCase("#if ${} > 0"),
+                new JPPParserTest.ThrowingTestCase("//#if defined()"),
+                new JPPParserTest.ThrowingTestCase("//#if ${} > 0"),
 
                 // incomplete expressions
-                new JPPParserTest.ThrowingTestCase("#if 1 >"),
-                new JPPParserTest.ThrowingTestCase("#if  == 2"),
-                new JPPParserTest.ThrowingTestCase("#if  ${version} > ")
+                new JPPParserTest.ThrowingTestCase("//#if 1 >"),
+                new JPPParserTest.ThrowingTestCase("//#if  == 2"),
+                new JPPParserTest.ThrowingTestCase("//#if  ${version} > ")
         );
     }