feat: 增加ticks算法单测

src/chart/controller/scale.js

@@ -1,7 +1,7 @@
 import { getScale, registerTickMethod } from '@antv/scale';
 import { isNil, mix, isObject, each, isArray, isString, isNumber, Array } from '../../util/common';
 import Global from '../../global';
-import TimeCat from './f2-time-cat';
+import TimeCat from './timecat-tick';
 // 覆盖0.3.x的 timecat scale算法
 registerTickMethod('time-cat', TimeCat);
 

src/chart/controller/f2-time-cat.js → src/chart/controller/timecat-tick.js

@@ -2,12 +2,12 @@
 export default cfg => {
 
   const { values, tickCount } = cfg;
-  if (values.length === 0) {
-    return values[0];
+  if (values.length === 1) {
+    return values;
   }
 
-  // 获取间隔步长
-  const step = parseInt(values.length / (tickCount - 1));
+  // 获取间隔步长, 最小是1
+  const step = parseInt(values.length / (tickCount - 1)) || 1;
   const ticks = [];
 
   // 按间隔数取对应节点

test/unit/chart/controller/timecat-tick-spec.js

@@ -0,0 +1,37 @@
+import timeCat from '../../../../src/chart/controller/timecat-tick.js';
+
+describe('Scale controller', function() {
+  it('tickCount 3', () => {
+    const ticks = timeCat({
+      tickCount: 3,
+      values: [ 1590076800000, 1590336000000, 1590422400000, 1590508800000, 1590595200000, 1590681600000, 1590940800000, 1591027200000, 1591113600000, 1591200000000, 1591286400000, 1591545600000, 1591632000000, 1591718400000, 1591804800000, 1591891200000, 1592150400000, 1592236800000, 1592323200000, 1592409600000, 1592496000000, 1592755200000, 1592841600000, 1592928000000 ]
+    });
+    expect(ticks).toEqual([ 1590076800000, 1591632000000, 1592928000000 ]);
+  });
+
+  it('tickCount 5', () => {
+    const ticks = timeCat({
+      tickCount: 5,
+      values: [ 1590076800000, 1590336000000, 1590422400000, 1590508800000, 1590595200000, 1590681600000, 1590940800000, 1591027200000, 1591113600000, 1591200000000, 1591286400000, 1591545600000, 1591632000000, 1591718400000, 1591804800000, 1591891200000, 1592150400000, 1592236800000, 1592323200000, 1592409600000, 1592496000000, 1592755200000, 1592841600000, 1592928000000 ]
+    });
+    expect(ticks).toEqual([ 1590076800000, 1590940800000, 1591632000000, 1592323200000, 1592928000000 ]);
+  });
+
+  it('values 2', () => {
+    const ticks = timeCat({
+      tickCount: 3,
+      values: [ 1590076800000, 1591632000000 ]
+    });
+    expect(ticks).toEqual([ 1590076800000, 1591632000000 ]);
+  });
+
+
+  it('values 1', () => {
+    const ticks = timeCat({
+      tickCount: 3,
+      values: [ 1590076800000 ]
+    });
+    expect(ticks).toEqual([ 1590076800000 ]);
+  });
+
+});