Remove viewport test

It's not tightly linked to renderer and depends on devicePixelRatio.

src/Viewport.test.ts

@@ -1,90 +0,0 @@
-/**
- * Copyright (c) 2016 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-import { assert } from 'chai';
-import { Viewport } from './Viewport';
-import { BufferSet } from './BufferSet';
-
-describe('Viewport', () => {
-  let terminal;
-  let viewportElement;
-  let charMeasure;
-  let viewport;
-  let scrollAreaElement;
-
-  const CHARACTER_HEIGHT = 10;
-
-  beforeEach(() => {
-    terminal = {
-      rows: 0,
-      ydisp: 0,
-      on: () => {},
-      rowContainer: {
-        style: {
-          lineHeight: 0
-        }
-      },
-      selectionContainer: {
-        style: {
-          height: 0
-        }
-      },
-      options: {
-        scrollback: 10,
-        lineHeight: 1
-      }
-    };
-    terminal.buffers = new BufferSet(terminal);
-    terminal.buffer = terminal.buffers.active;
-    viewportElement = {
-      addEventListener: () => {},
-      style: {
-        height: 0,
-        lineHeight: 0
-      }
-    };
-    scrollAreaElement = {
-      style: {
-        height: 0
-      }
-    };
-    charMeasure = {
-      height: CHARACTER_HEIGHT
-    };
-    viewport = new Viewport(terminal, viewportElement, scrollAreaElement, charMeasure);
-  });
-
-  describe('refresh', () => {
-    it('should set the height of the viewport when the line-height changed', () => {
-      terminal.buffer.lines.push('');
-      terminal.buffer.lines.push('');
-      terminal.rows = 1;
-      viewport.refresh();
-      assert.equal(viewportElement.style.height, 1 * CHARACTER_HEIGHT + 'px');
-      charMeasure.height = 2 * CHARACTER_HEIGHT;
-      viewport.refresh();
-      assert.equal(viewportElement.style.height, 2 * CHARACTER_HEIGHT + 'px');
-    });
-  });
-
-  describe('syncScrollArea', () => {
-    it('should sync the scroll area', done => {
-      // Allow CharMeasure to be initialized
-      setTimeout(() => {
-        terminal.buffer.lines.push('');
-        terminal.rows = 1;
-        assert.equal(scrollAreaElement.style.height, 0 * CHARACTER_HEIGHT + 'px');
-        viewport.syncScrollArea();
-        assert.equal(viewportElement.style.height, 1 * CHARACTER_HEIGHT + 'px');
-        assert.equal(scrollAreaElement.style.height, 1 * CHARACTER_HEIGHT + 'px');
-        terminal.buffer.lines.push('');
-        viewport.syncScrollArea();
-        assert.equal(viewportElement.style.height, 1 * CHARACTER_HEIGHT + 'px');
-        assert.equal(scrollAreaElement.style.height, 2 * CHARACTER_HEIGHT + 'px');
-        done();
-      }, 0);
-    });
-  });
-});