test(json-crdt-extensions): 💍 add cursor movement tests

src/json-crdt-extensions/peritext/__tests__/Peritext.cursor.spec.ts

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+import {InlineAttrPos} from '../block/Inline';
+import {CursorAnchor, SliceTypes} from '../slice/constants';
+import {setupKit} from './setup';
+
+const setup = () => {
+  const kit = setupKit();
+  kit.peritext.strApi().ins(0, 'ab');
+  return kit;
+};
+
+test('cursor at the start of string and slice annotation at the start of string', () => {
+  const {peritext, editor} = setup();
+  editor.cursor.setAt(0, 1);
+  editor.saved.insOverwrite('bold');
+  editor.cursor.setAt(0);
+  peritext.refresh();
+  const blocks = peritext.blocks.root;
+  const leaf = blocks.children[0];
+  const inlines = [...leaf.texts()];
+  const inline1 = inlines[0];
+  const inline2 = inlines[1];
+  const inline3 = inlines[2];
+  expect(inlines.length).toBe(3);
+  expect(inline1.text()).toBe('');
+  expect(inline2.text()).toBe('a');
+  expect(inline3.text()).toBe('b');
+  expect(inline1.attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+  expect(inline2.attr()).toEqual({bold: [1, InlineAttrPos.Contained]});
+  expect(inline3.attr()).toEqual({});
+});
+
+test('cursor walking over character marked as bold', () => {
+  const {peritext, editor} = setup();
+  editor.cursor.setAt(0, 1);
+  editor.saved.insStack('bold');
+  editor.cursor.setAt(0);
+  peritext.refresh();
+  editor.cursor.move(1);
+  peritext.refresh();
+  const blocks = peritext.blocks.root;
+  const leaf = blocks.children[0];
+  const inlines = [...leaf.texts()]
+  const inline1 = inlines[0];
+  const inline2 = inlines[1];
+  const inline3 = inlines[2];
+  expect(inlines.length).toBe(3);
+  expect(inline1.text()).toBe('');
+  expect(inline2.text()).toBe('a');
+  expect(inline3.text()).toBe('b');
+  expect(inline2.attr()).toEqual({bold: [[void 0], InlineAttrPos.Contained]});
+  expect(inline3.attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+  editor.cursor.move(1);
+  peritext.refresh();
+});
+
+test('cursor walking over character marked as bold and one more', () => {
+  const {peritext, editor} = setup();
+  editor.cursor.setAt(0, 1);
+  editor.saved.insOverwrite('bold');
+  editor.cursor.setAt(0);
+  peritext.refresh();
+  editor.cursor.move(1);
+  editor.cursor.move(1);
+  peritext.refresh();
+  const blocks = peritext.blocks.root;
+  const leaf = blocks.children[0];
+  const inlines = [...leaf.texts()];
+  const [inline1, inline2, inline3, inline4] = inlines;
+  expect(inlines.length).toBe(4);
+  expect(inline1.text()).toBe('');
+  expect(inline2.text()).toBe('a');
+  expect(inline3.text()).toBe('b');
+  expect(inline4.text()).toBe('');
+  expect(inline2.attr()).toEqual({bold: [1, InlineAttrPos.Contained]});
+  expect(inline3.attr()).toEqual({});
+  expect(inline4.attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+});
+
+test('cursor can move across block boundary forwards', () => {
+  const {peritext, editor} = setup();
+  editor.cursor.setAt(1);
+  editor.saved.insMarker(['p'], '\n');
+  editor.cursor.setAt(0);
+  peritext.refresh();
+  // console.log(peritext + '');
+  expect(peritext.blocks.root.children.length).toBe(2);
+  expect([...peritext.blocks.root.children[0].texts()].length).toBe(1);
+  expect([...peritext.blocks.root.children[0].texts()][0].text()).toBe('a');
+  expect([...peritext.blocks.root.children[0].texts()][0].attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+  editor.cursor.move(1);
+  peritext.refresh();
+  expect(peritext.blocks.root.children.length).toBe(2);
+  expect([...peritext.blocks.root.children[0].texts()].length).toBe(2);
+  expect([...peritext.blocks.root.children[0].texts()][0].text()).toBe('a');
+  expect([...peritext.blocks.root.children[0].texts()][0].attr()).toEqual({});
+  expect([...peritext.blocks.root.children[0].texts()][1].text()).toBe('');
+  expect([...peritext.blocks.root.children[0].texts()][1].attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+  expect([...peritext.blocks.root.children[1].texts()].length).toBe(1);
+  expect([...peritext.blocks.root.children[1].texts()][0].text()).toBe('b');
+  expect([...peritext.blocks.root.children[1].texts()][0].attr()).toEqual({});
+  editor.cursor.move(1);
+  peritext.refresh();
+  expect(peritext.blocks.root.children.length).toBe(2);
+  expect([...peritext.blocks.root.children[0].texts()].length).toBe(1);
+  expect([...peritext.blocks.root.children[0].texts()][0].text()).toBe('a');
+  expect([...peritext.blocks.root.children[0].texts()][0].attr()).toEqual({});
+  expect([...peritext.blocks.root.children[1].texts()].length).toBe(2);
+  expect([...peritext.blocks.root.children[1].texts()][0].text()).toBe('');
+  expect([...peritext.blocks.root.children[1].texts()][0].attr()).toEqual({});
+  expect([...peritext.blocks.root.children[1].texts()][1].text()).toBe('b');
+  expect([...peritext.blocks.root.children[1].texts()][1].attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+  editor.cursor.move(1);
+  peritext.refresh();
+  expect(peritext.blocks.root.children.length).toBe(2);
+  expect([...peritext.blocks.root.children[0].texts()].length).toBe(1);
+  expect([...peritext.blocks.root.children[0].texts()][0].text()).toBe('a');
+  expect([...peritext.blocks.root.children[0].texts()][0].attr()).toEqual({});
+  expect([...peritext.blocks.root.children[1].texts()].length).toBe(2);
+  expect([...peritext.blocks.root.children[1].texts()][0].text()).toBe('b');
+  expect([...peritext.blocks.root.children[1].texts()][0].attr()).toEqual({});
+  expect([...peritext.blocks.root.children[1].texts()][1].text()).toBe('');
+  expect([...peritext.blocks.root.children[1].texts()][1].attr()).toEqual({
+    [SliceTypes.Cursor]: [[[CursorAnchor.Start, void 0]], InlineAttrPos.Collapsed]
+  });
+});
+
+
+test.todo('moving past text end keeps cursor at text end');