add test case to reproduce issue #256

Issue is caused by SQLDev 23.1, SQLcl 23.3.
We cannot fix it in the Arbori code.
Therefore the tests are disabled for the time being.

standalone/src/test/java/com/trivadis/plsql/formatter/settings/tests/issues/Issue_256_linebreak_in_string.java

@@ -0,0 +1,49 @@
+package com.trivadis.plsql.formatter.settings.tests.issues;
+
+import com.trivadis.plsql.formatter.settings.ConfiguredTestFormatter;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInstance;
+
+import java.io.IOException;
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+@Disabled("Bug in SQLDev 23.1, SQLcl 23.3")
+public class Issue_256_linebreak_in_string extends ConfiguredTestFormatter {
+    @Test
+    public void escaped_entity_in_string() throws IOException {
+        var input = """
+                begin
+                   dbms_output.put_line('</');
+                end;
+                /
+                """;
+        var expected = """
+                begin
+                   dbms_output.put_line('</');
+                end;
+                /
+                """;
+        var actual = getFormatter().format(input);
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void semi_slash_in_string() throws IOException {
+        var input = """
+                begin
+                   dbms_output.put_line(';/');
+                end;
+                /
+                """;
+        var expected = """
+                begin
+                   dbms_output.put_line(';/');
+                end;
+                /
+                """;
+        var actual = getFormatter().format(input);
+        assertEquals(expected, actual);
+    }
+
+}