Remove HistogramChart loading test

ui/test/shared/components/HistogramChart.test.tsx

@@ -1,5 +1,5 @@
 import React from 'react'
-import {mount, shallow} from 'enzyme'
+import {mount} from 'enzyme'
 
 import HistogramChart from 'src/shared/components/HistogramChart'
 import HistogramChartTooltip from 'src/shared/components/HistogramChartTooltip'
@@ -89,19 +89,4 @@ describe('HistogramChart', () => {
 
     expect(tooltip).toMatchSnapshot()
   })
-
-  test('has a "loading" class if data is reloading', () => {
-    const props = {
-      data: [{key: '', time: 0, value: 0, group: ''}],
-      dataStatus: RemoteDataState.Loading,
-      width: 600,
-      height: 400,
-      colorScale: () => 'blue',
-      onZoom: () => {},
-    }
-
-    const wrapper = shallow(<HistogramChart {...props} />)
-
-    expect(wrapper.find('.histogram-chart').hasClass('loading')).toBe(true)
-  })
 })

ui/test/shared/components/__snapshots__/HistogramChart.test.tsx.snap

@@ -174,7 +174,7 @@ exports[`HistogramChart displays the visualization with bars if nonempty data is
   width={600}
 >
   <svg
-    className="histogram-chart "
+    className="histogram-chart"
     height={400}
     width={600}
   >