[explore-v2] hook up ExploreViewContainer to state and add specs (#1300)

* add getParams func to common

* get data from redux state

* specs for chart container and explore view container

caravel/assets/spec/javascripts/explorev2/components/ChartContainer_spec.js

@@ -0,0 +1,39 @@
+import React from 'react';
+import { expect } from 'chai';
+import { describe, it } from 'mocha';
+
+import ChartContainer from '../../../../javascripts/explorev2/components/ChartContainer';
+
+describe('ChartContainer', () => {
+  const mockProps = {
+    data: [
+      {
+        classed: '',
+        key: 'Label 1',
+        values: [
+          {
+            x: -158766400000,
+            y: 57,
+          },
+          {
+            x: -156766400000,
+            y: 157,
+          },
+          {
+            x: -157766400000,
+            y: 257,
+          },
+        ],
+      },
+    ],
+    sliceName: 'Trend Line',
+    vizType: 'line',
+    height: '500px',
+  };
+
+  it('renders when vizType is line', () => {
+    expect(
+      React.isValidElement(<ChartContainer {...mockProps} />)
+    ).to.equal(true);
+  });
+});