diff.test.ts

suite('diff', () => {
  suite('transformRange', () => {
    test('add one line at beginning', () => {
      const diff = new Diff(`diff --git a/comments.txt b/comments.txt
index 63ef680..47010db 100644
--- a/comments.txt
+++ b/comments.txt
@@ -1,3 +1,4 @@
+added line
 this is line 1
 this is line 2
 this is line 3
`);
      assert.deepEqual(diff.transformRange(new ZeroIndexedRange(0, 0, 0, 1)), new ZeroIndexedRange(1, 0, 1, 1));
      assert.deepEqual(diff.transformRange(new ZeroIndexedRange(1, 0, 1, 1)), new ZeroIndexedRange(2, 0, 2, 1));
    });

    test('add one line at beginning -U0', () => {
      const diff = new Diff(`diff --git a/comments.txt b/comments.txt
index 63ef680..47010db 100644
--- a/comments.txt
+++ b/comments.txt
@@ -0,0 +1 @@
+added line
`);
      assert.deepEqual(diff.transformRange(new ZeroIndexedRange(0, 0, 0, 1)), new ZeroIndexedRange(1, 0, 1, 1));
      assert.deepEqual(diff.transformRange(new ZeroIndexedRange(1, 0, 1, 1)), new ZeroIndexedRange(2, 0, 2, 1));
    });
  });
});