Add testcases - traverseGenerator-basic for function component

test/traverseGenerator-basic.spec.tsx

@@ -1,17 +1,20 @@
-// import * as React from "react";
+import * as React from "react";
 
 // Import stuff from src
+import {
+  FiberNodeForComponentClass,
+  FiberNodeForInstrinsicElement,
+  FiberNodeForFunctionComponent
+} from "../src/mocked-types";
 import { traverseGenerator } from "../src";
 
 // Import test helpers and sample components
 import { mountAndGetRootNode } from "./utils/mount-in-enzyme";
+import getWrappedComponent from './utils/getWrappedComponent';
 import CDepth1 from "./sample-components/depth-1-simple";
 import CDepth2 from "./sample-components/depth-2-simple";
 import CDepth5 from "./sample-components/depth-5-simple";
-import {
-  FiberNodeForComponentClass,
-  FiberNodeForInstrinsicElement
-} from "../src/mocked-types";
+import FnDepth1 from './sample-components/depth-1-fn-simple';
 
 describe("traverseGenerator", () => {
   let container: HTMLDivElement;
@@ -58,5 +61,66 @@ describe("traverseGenerator", () => {
 
       expect(nodes.length).toBe(5);
     });
+
+    it("should work for depth=1 function", () => {
+      const WrappedC = getWrappedComponent(FnDepth1);
+      const rootNode = mountAndGetRootNode(WrappedC, container)
+        .child as FiberNodeForFunctionComponent;
+
+      const nodeIterator = traverseGenerator(rootNode);
+      const nodes = [...nodeIterator];
+
+      // Can't be zero, in any case
+      expect(nodes.length).not.toBe(0);
+      // Check that only one node is yielded
+      expect(nodes.length).toBe(1);
+      // Check type of node
+      expect((nodes[0] as FiberNodeForComponentClass).type).toBe(FnDepth1);
+    });
+
+    it("should work for depth=3 function", () => {
+      function Fn1() {
+        return <Fn2 />;
+      }
+      function Fn2() {
+        return <div>Fn2 here</div>;
+      }
+
+      const WrappedC = getWrappedComponent(Fn1);
+      const rootNode = mountAndGetRootNode(WrappedC, container)
+        .child as FiberNodeForFunctionComponent;
+
+      const nodeIterator = traverseGenerator(rootNode);
+      const nodes = [...nodeIterator];
+
+      // Check that only 3 nodes are yielded
+      expect(nodes.length).toBe(3);
+      // Check depth-based order (default order)
+      expect((nodes[0] as FiberNodeForFunctionComponent).type).toBe(Fn1);
+      expect((nodes[1] as FiberNodeForFunctionComponent).type).toBe(Fn2);
+    });
+
+    it("should work for depth=5 function", () => {
+      function Fn1() {
+        return (
+          <header>
+            <Fn2 />
+            <button />
+          </header>
+        );
+      }
+      function Fn2() {
+        return <div>Fn2 here</div>;
+      }
+
+      const WrappedC = getWrappedComponent(Fn1);
+      const rootNode = mountAndGetRootNode(WrappedC, container)
+        .child as FiberNodeForFunctionComponent;
+
+      const nodeIterator = traverseGenerator(rootNode);
+      const nodes = [...nodeIterator];
+
+      expect(nodes.length).toBe(5);
+    });
   });
 });