Add another regression test that deletes all lines and inserts two

strings where the first ends in a newline.

Author: webzwo0i

src/node/easysync_tests.js

@@ -227,6 +227,11 @@ const runTests = () => {
     ['insert', 'a'],
     ['insert', 'c\n', 1],
   ], ['ac\n']);
+  runMutationTest(10, ['\n'], [
+    ['remove', 1, 1, '\n'],
+    ['insert', 'a\n', 1],
+    ['insert', 'c'],
+  ], ['a\n', 'c']); // TODO find out if c must have a newline because of unknown constraints
 
   const poolOrArray = (attribs) => {
     if (attribs.getAttrib) {