test: add test case for issue 488, the bug has fixed at antvis/adjust#2…

…, Closed #488.

test/bug/issue-488-spec.js

@@ -0,0 +1,46 @@
+const expect = require('chai').expect;
+const F2 = require('../../src/core');
+require('../../src/geom/interval');
+require('../../src/geom/adjust/dodge');
+
+describe('Issue 488', () => {
+  let canvas;
+  let chart;
+  before(() => {
+    canvas = document.createElement('canvas');
+    canvas.width = 300;
+    canvas.height = 300;
+    canvas.id = 'issue488';
+    document.body.appendChild(canvas);
+  });
+
+  it('Issue 488', () => {
+    const data = [
+      { name: 'London', 月份: 'Jan.', 月均降雨量: 18.9 },
+      { name: 'Berlin', 月份: 'Jan.', 月均降雨量: 12.4 }
+    ];
+    chart = new F2.Chart({
+      id: 'issue488',
+      pixelRatio: window.devicePixelRatio
+    });
+
+    chart.source(data);
+    const interval = chart.interval()
+      .position('月份*月均降雨量')
+      .color('name')
+      .adjust({
+        type: 'dodge',
+        marginRatio: 0
+      });
+    chart.render();
+
+    const dataArray = interval.get('dataArray');
+    expect(dataArray[0][0].points[0].x).to.equal(0.25);
+    expect(dataArray[1][0].points[0].x).to.equal(0.5);
+  });
+
+  after(() => {
+    chart.destroy();
+    document.body.removeChild(canvas);
+  });
+});