add test cases for A23: enforce line break after single line comment to reproduce #197

Author: PhilippSalvisberg

standalone/src/test/java/com/trivadis/plsql/formatter/settings/tests/rules/A23_enforce_line_break_after_single_line_comment.java

@@ -0,0 +1,53 @@
+package com.trivadis.plsql.formatter.settings.tests.rules;
+
+import com.trivadis.plsql.formatter.settings.ConfiguredTestFormatter;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+
+public class A23_enforce_line_break_after_single_line_comment extends ConfiguredTestFormatter {
+
+    @Nested
+    class case_expression {
+
+        @Test
+        public void comment_before_then() {
+            var sql = """
+                    select empno,
+                           ename,
+                           case
+                              when 'JOB' = 'SALESMAN' -- make gender-neutral
+                              then
+                                 'SALESPERSON'
+                              else
+                                 job
+                           end as job,
+                           sal
+                      from emp;
+                    """;
+            formatAndAssert(sql);
+        }
+
+        @Test
+        public void comment_after_every_token() {
+            var sql = """
+                    select empno,
+                           ename,
+                           case
+                              when              -- comment 1
+                                 'JOB'          -- comment 2
+                                 =              -- comment 3
+                                 'SALESMAN'     -- comment 4
+                              then              -- comment 5
+                                 'SALESPERSON'  -- comment 6
+                              else              -- comment 7
+                                 job            -- comment 8
+                           end                  -- comment 9
+                           as                   -- comment 10
+                           job,
+                           sal
+                      from emp;
+                    """;
+            formatAndAssert(sql);
+        }
+    }
+}