test: Add tests for TOC component (nodejs#204)

ollelauribostrom · sagirk · commit b8a186f3ebb8 · 2019-03-27T14:52:09.000+05:30
## Description
- Adding tests for TOC component
diff --git a/test/components/__snapshots__/toc.test.tsx.snap b/test/components/__snapshots__/toc.test.tsx.snap
@@ -0,0 +1,20 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`TOC component renders correctly 1`] = `
+<details
+  className="toc"
+>
+  <summary>
+    <h6>
+      TABLE OF CONTENTS
+    </h6>
+  </summary>
+  <div
+    dangerouslySetInnerHTML={
+      Object {
+        "__html": "mock-toc",
+      }
+    }
+  />
+</details>
+`;
diff --git a/test/components/toc.test.tsx b/test/components/toc.test.tsx
@@ -0,0 +1,22 @@
+import React from 'react';
+import renderer from 'react-test-renderer';
+import TOC from '../../src/components/toc';
+
+describe('TOC component', () => {
+  it('renders correctly', () => {
+    const heading = 'TABLE OF CONTENTS';
+    const tableOfContents = 'mock-toc';
+    const tree = renderer
+      .create(<TOC heading={heading} tableOfContents={tableOfContents} />)
+      .toJSON();
+    expect(tree).toMatchSnapshot();
+  });
+  it('does not render without a table of contents', () => {
+    const heading = 'TABLE OF CONTENTS';
+    const tableOfContents = null;
+    const tree = renderer.create(
+      <TOC heading={heading} tableOfContents={tableOfContents} />
+    );
+    expect(tree.getInstance()).toBeNull();
+  });
+});
