test cases

src/BufferLine.test.ts

@@ -357,4 +357,42 @@ describe('BufferLine', function(): void {
       chai.expect(line.translateToString(true, 0, 0)).equal('');
     });
   });
+  describe('addCharToCell', () => {
+    it('should set width to 1 for empty cell', () => {
+      const line = new TestBufferLine(3, CellData.fromCharData([DEFAULT_ATTR, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]), false);
+      line.addCharToCell(0, '\u0301'.charCodeAt(0));
+      const cell = line.loadCell(0, new CellData());
+      // chars contains single combining char
+      // width is set to 1
+      chai.assert.deepEqual(cell.asCharData, [DEFAULT_ATTR, '\u0301', 1, 0x0301]);
+      // do not account a single combining char as combined
+      chai.assert.equal(cell.combined, 0);
+    });
+    it('should add char to combining string in cell', () => {
+      const line = new TestBufferLine(3, CellData.fromCharData([DEFAULT_ATTR, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]), false);
+      const cell = line .loadCell(0, new CellData());
+      cell.setFromCharData([123, 'e\u0301', 1, 'e\u0301'.charCodeAt(1)]);
+      line.setCell(0, cell);
+      line.addCharToCell(0, '\u0301'.charCodeAt(0));
+      line.loadCell(0, cell);
+      // chars contains 3 chars
+      // width is set to 1
+      chai.assert.deepEqual(cell.asCharData, [123, 'e\u0301\u0301', 1, 0x0301]);
+      // do not account a single combining char as combined
+      chai.assert.equal(cell.combined, Content.IS_COMBINED);
+    });
+    it('should create combining string on taken cell', () => {
+      const line = new TestBufferLine(3, CellData.fromCharData([DEFAULT_ATTR, NULL_CELL_CHAR, NULL_CELL_WIDTH, NULL_CELL_CODE]), false);
+      const cell = line .loadCell(0, new CellData());
+      cell.setFromCharData([123, 'e', 1, 'e'.charCodeAt(1)]);
+      line.setCell(0, cell);
+      line.addCharToCell(0, '\u0301'.charCodeAt(0));
+      line.loadCell(0, cell);
+      // chars contains 2 chars
+      // width is set to 1
+      chai.assert.deepEqual(cell.asCharData, [123, 'e\u0301', 1, 0x0301]);
+      // do not account a single combining char as combined
+      chai.assert.equal(cell.combined, Content.IS_COMBINED);
+    });
+  });
 });