1 files changed, 0 insertions, 237 deletions
diff --git a/spec/frontend/lib/utils/undo_stack_spec.js b/spec/frontend/lib/utils/undo_stack_spec.js
deleted file mode 100644
index 31ad0e77d6f..00000000000
--- a/spec/frontend/lib/utils/undo_stack_spec.js
+++ /dev/null
@@ -1,237 +0,0 @@
-import UndoStack from '~/lib/utils/undo_stack';
-
-import { isEqual } from 'underscore';
-
-describe('UndoStack', () => {
-  let stack;
-
-  beforeEach(() => {
-    stack = new UndoStack();
-  });
-
-  afterEach(() => {
-    // Make sure there's not pending saves
-    const history = Array.from(stack.history);
-    jest.runAllTimers();
-    expect(stack.history).toEqual(history);
-  });
-
-  it('is blank on construction', () => {
-    expect(stack.isEmpty()).toBe(true);
-    expect(stack.history).toEqual([]);
-    expect(stack.cursor).toBe(-1);
-    expect(stack.canUndo()).toBe(false);
-    expect(stack.canRedo()).toBe(false);
-  });
-
-  it('handles simple undo/redo behaviour', () => {
-    stack.save(10);
-    stack.save(11);
-    stack.save(12);
-
-    expect(stack.history).toEqual([10, 11, 12]);
-    expect(stack.cursor).toBe(2);
-    expect(stack.current()).toBe(12);
-    expect(stack.isEmpty()).toBe(false);
-    expect(stack.canUndo()).toBe(true);
-    expect(stack.canRedo()).toBe(false);
-
-    stack.undo();
-    expect(stack.history).toEqual([10, 11, 12]);
-    expect(stack.current()).toBe(11);
-    expect(stack.canUndo()).toBe(true);
-    expect(stack.canRedo()).toBe(true);
-
-    stack.undo();
-    expect(stack.current()).toBe(10);
-    expect(stack.canUndo()).toBe(false);
-    expect(stack.canRedo()).toBe(true);
-
-    stack.redo();
-    expect(stack.current()).toBe(11);
-
-    stack.redo();
-    expect(stack.current()).toBe(12);
-    expect(stack.isEmpty()).toBe(false);
-    expect(stack.canUndo()).toBe(true);
-    expect(stack.canRedo()).toBe(false);
-
-    // Saving should clear the redo stack
-    stack.undo();
-    stack.save(13);
-    expect(stack.history).toEqual([10, 11, 13]);
-    expect(stack.current()).toBe(13);
-  });
-
-  it('clear() should clear the undo history', () => {
-    stack.save(0);
-    stack.save(1);
-    stack.save(2);
-    stack.clear();
-    expect(stack.history).toEqual([]);
-    expect(stack.current()).toBeUndefined();
-  });
-
-  it('undo and redo are no-ops if unavailable', () => {
-    stack.save(10);
-    expect(stack.canRedo()).toBe(false);
-    expect(stack.canUndo()).toBe(false);
-
-    stack.save(11);
-    expect(stack.canRedo()).toBe(false);
-    expect(stack.canUndo()).toBe(true);
-
-    expect(stack.redo()).toBeUndefined();
-    expect(stack.history).toEqual([10, 11]);
-    expect(stack.current()).toBe(11);
-    expect(stack.canRedo()).toBe(false);
-    expect(stack.canUndo()).toBe(true);
-
-    expect(stack.undo()).toBe(10);
-    expect(stack.undo()).toBeUndefined();
-    expect(stack.history).toEqual([10, 11]);
-    expect(stack.current()).toBe(10);
-    expect(stack.canRedo()).toBe(true);
-    expect(stack.canUndo()).toBe(false);
-  });
-
-  it('should not save a duplicate state', () => {
-    stack.save(10);
-    stack.save(11);
-    stack.save(11);
-    stack.save(10);
-    stack.save(10);
-
-    expect(stack.history).toEqual([10, 11, 10]);
-  });
-
-  it('uses the === operator to detect duplicates', () => {
-    stack.save(10);
-    stack.save(10);
-    expect(stack.history).toEqual([10]);
-
-    // eslint-disable-next-line eqeqeq
-    expect(2 == '2' && '2' == 2).toBe(true);
-    stack.clear();
-    stack.save(2);
-    stack.save(2);
-    stack.save('2');
-    stack.save('2');
-    stack.save(2);
-    expect(stack.history).toEqual([2, '2', 2]);
-
-    const obj = {};
-    stack.clear();
-    stack.save(obj);
-    stack.save(obj);
-    stack.save({});
-    stack.save({});
-    expect(stack.history).toEqual([{}, {}, {}]);
-  });
-
-  it('should allow custom comparators', () => {
-    stack.comparator = isEqual;
-    const obj = {};
-    stack.clear();
-    stack.save(obj);
-    stack.save(obj);
-    stack.save({});
-    stack.save({});
-    expect(stack.history).toEqual([{}]);
-  });
-
-  it('should enforce a max number of undo states', () => {
-    // Try 2000 saves. Only the last 1000 should be preserved.
-    const sequence = Array(2000)
-      .fill(0)
-      .map((el, i) => i);
-    sequence.forEach(stack.save.bind(stack));
-    expect(stack.history.length).toBe(1000);
-    expect(stack.history).toEqual(sequence.slice(1000));
-    expect(stack.current()).toBe(1999);
-    expect(stack.canUndo()).toBe(true);
-    expect(stack.canRedo()).toBe(false);
-
-    // Saving drops the oldest elements from the stack
-    stack.save('end');
-    expect(stack.history.length).toBe(1000);
-    expect(stack.current()).toBe('end');
-    expect(stack.history).toEqual([...sequence.slice(1001), 'end']);
-
-    // If states were undone but the history is full, can still add.
-    stack.undo();
-    stack.undo();
-    expect(stack.current()).toBe(1998);
-    stack.save(3000);
-    expect(stack.history.length).toBe(999);
-    // should be [1001, 1002, ..., 1998, 3000]
-    expect(stack.history).toEqual([...sequence.slice(1001, 1999), 3000]);
-
-    // Try a different max length
-    stack = new UndoStack(2);
-    stack.save(0);
-    expect(stack.history).toEqual([0]);
-    stack.save(1);
-    expect(stack.history).toEqual([0, 1]);
-    stack.save(2);
-    expect(stack.history).toEqual([1, 2]);
-  });
-
-  describe('scheduled saves', () => {
-    it('should work', () => {
-      // Schedules 1000 ms ahead by default
-      stack.save(0);
-      stack.scheduleSave(1);
-      expect(stack.history).toEqual([0]);
-      jest.advanceTimersByTime(999);
-      expect(stack.history).toEqual([0]);
-      jest.advanceTimersByTime(1);
-      expect(stack.history).toEqual([0, 1]);
-    });
-
-    it('should have an adjustable delay', () => {
-      stack.scheduleSave(2, 100);
-      jest.advanceTimersByTime(100);
-      expect(stack.history).toEqual([2]);
-    });
-
-    it('should cancel previous scheduled saves', () => {
-      stack.scheduleSave(3);
-      jest.advanceTimersByTime(100);
-      stack.scheduleSave(4);
-      jest.runAllTimers();
-      expect(stack.history).toEqual([4]);
-    });
-
-    it('should be canceled by explicit saves', () => {
-      stack.scheduleSave(5);
-      stack.save(6);
-      jest.runAllTimers();
-      expect(stack.history).toEqual([6]);
-    });
-
-    it('should be canceled by undos and redos', () => {
-      stack.save(1);
-      stack.save(2);
-      stack.scheduleSave(3);
-      stack.undo();
-      jest.runAllTimers();
-      expect(stack.history).toEqual([1, 2]);
-      expect(stack.current()).toBe(1);
-
-      stack.scheduleSave(4);
-      stack.redo();
-      jest.runAllTimers();
-      expect(stack.history).toEqual([1, 2]);
-      expect(stack.current()).toBe(2);
-    });
-
-    it('should be persisted immediately with saveNow()', () => {
-      stack.scheduleSave(7);
-      stack.scheduleSave(8);
-      stack.saveNow();
-      jest.runAllTimers();
-      expect(stack.history).toEqual([8]);
-    });
-  });
-});