Add testcase - traverse-nested misc

test/sample-components/depth-2-nested-1.tsx

@@ -0,0 +1,16 @@
+// import * as PropTypes from "prop-types";
+import * as React from "react";
+
+class CDepth2Nested1 extends React.Component {
+  render() {
+    return <CDepth0></CDepth0>;
+  }
+}
+
+class CDepth0 extends React.Component {
+  render() {
+    return null;
+  }
+}
+
+export default CDepth2Nested1;

test/sample-components/depth-3-nested-1.tsx

@@ -0,0 +1,20 @@
+// import * as PropTypes from "prop-types";
+import * as React from "react";
+
+class CDepth3Nested1 extends React.Component {
+  render() {
+    return (
+      <div>
+        <CDepth0></CDepth0>
+      </div>
+    );
+  }
+}
+
+class CDepth0 extends React.Component {
+  render() {
+    return null;
+  }
+}
+
+export default CDepth3Nested1;

test/traverse-nested.spec.tsx

@@ -0,0 +1,43 @@
+// import * as React from "react";
+
+// Import stuff from src
+import { traverse } from "../src";
+
+// Import test helpers and sample components
+import { mountAndGetRootNode } from "./utils/mount-in-enzyme";
+import CDepth2Nested1 from "./sample-components/depth-2-nested-1";
+import CDepth3Nested1 from "./sample-components/depth-3-nested-1";
+
+describe("traverse", () => {
+  let container: HTMLDivElement;
+
+  beforeEach(() => {
+    container = document.body.appendChild(document.createElement("div"));
+  });
+
+  afterEach(() => {
+    document.body.removeChild(container);
+  });
+
+  describe("nested", () => {
+    it("should work for depth=2 with level of nesting=1", () => {
+      const rootNode = mountAndGetRootNode(CDepth2Nested1, container);
+      const mockCallback = jest.fn();
+
+      traverse(rootNode, mockCallback);
+
+      expect(mockCallback.mock.calls.length).toBe(2);
+    });
+  });
+
+  it("should work for depth=3 with level of nesting=1", () => {
+    const rootNode = mountAndGetRootNode(CDepth3Nested1, container);
+    const mockCallback = jest.fn();
+
+    traverse(rootNode, mockCallback);
+
+    // Shouldn't count just component depth, should include string nodes
+    expect(mockCallback.mock.calls.length).not.toBe(2);
+    expect(mockCallback.mock.calls.length).toBe(3);
+  });
+});