[bars] fix sort numeric bar on x axis (#2812)

superset/assets/spec/javascripts/modules/utils_spec.jsx

@@ -0,0 +1,38 @@
+import { it, describe } from 'mocha';
+import { expect } from 'chai';
+import {
+  tryNumify, slugify, formatSelectOptionsForRange, d3format,
+} from '../../../javascripts/modules/utils';
+
+describe('utils', () => {
+  it('tryNumify works as expected', () => {
+    expect(tryNumify(5)).to.equal(5);
+    expect(tryNumify('5')).to.equal(5);
+    expect(tryNumify('5.1')).to.equal(5.1);
+    expect(tryNumify('a string')).to.equal('a string');
+  });
+  it('slugify slugifies', () => {
+    expect(slugify('My Neat Label! ')).to.equal('my-neat-label');
+    expect(slugify('Some Letters AnD a 5')).to.equal('some-letters-and-a-5');
+    expect(slugify(' 439278 ')).to.equal('439278');
+    expect(slugify('5')).to.equal('5');
+  });
+  it('formatSelectOptionsForRange', () => {
+    expect(formatSelectOptionsForRange(0, 4)).to.deep.equal([
+      [0, '0'],
+      [1, '1'],
+      [2, '2'],
+      [3, '3'],
+      [4, '4'],
+    ]);
+    expect(formatSelectOptionsForRange(1, 2)).to.deep.equal([
+      [1, '1'],
+      [2, '2'],
+    ]);
+  });
+  it('d3format', () => {
+    expect(d3format('.3s', 1234)).to.equal('1.23k');
+    expect(d3format('.3s', 1237)).to.equal('1.24k');
+    expect(d3format('', 1237)).to.equal('1.24k');
+  });
+});