Merge pull request #309 from Citrinin/add-loader-test-snapshot

[add]: a unit test case for loader component

src/components/__tests__/__snapshots__/loader.test.js.snap

@@ -0,0 +1,23 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Loader renders correctly 1`] = `
+<div
+  className="loader"
+>
+  <span>
+    ↓
+  </span>
+  <span>
+    ↓
+  </span>
+  <span>
+    ↓
+  </span>
+  <span>
+    ↓
+  </span>
+  <span>
+    ↓
+  </span>
+</div>
+`;

src/components/__tests__/loader.test.js

@@ -0,0 +1,11 @@
+import React from "react"
+import renderer from "react-test-renderer"
+
+import Loader from "../loader"
+
+describe("Loader", () => {
+  it("renders correctly", () => {
+    const tree = renderer.create(<Loader />).toJSON()
+    expect(tree).toMatchSnapshot()
+  })
+})