Add snapshot tests

packages/react-bootstrap-table2/test/row-selection/__snapshots__/selection-cell.test.js.snap

@@ -0,0 +1,14 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<SelectionCell /> render should render component correctly 1`] = `
+<td
+  onClick={[Function]}
+>
+  <input
+    checked={true}
+    className=""
+    onChange={[Function]}
+    type="checkbox"
+  />
+</td>
+`;

packages/react-bootstrap-table2/test/row-selection/__snapshots__/selection-header-cell.test.js.snap

@@ -0,0 +1,9 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<CheckBox /> render should render component correctly 1`] = `
+<input
+  checked={true}
+  onChange={[Function]}
+  type="checkbox"
+/>
+`;

packages/react-bootstrap-table2/test/row-selection/selection-cell.test.js

@@ -170,7 +170,13 @@ describe('<SelectionCell />', () => {
     describe('when disabled prop give as true', () => {
       beforeEach(() => {
         wrapper = shallowWithContext(
-          <SelectionCell rowKey={ 1 } mode={ mode } rowIndex={ rowIndex } selected={ selected } disabled />,
+          <SelectionCell
+            rowKey={ 1 }
+            mode={ mode }
+            rowIndex={ rowIndex }
+            selected={ selected }
+            disabled
+          />,
           { bootstrap4: false }
         );
       });