test: add tests for start editing button in builder

Author: sairajchouhan

src/visualBuilder/components/__test__/startEditingButton.test.tsx

@@ -1,5 +1,5 @@
 import { render, fireEvent, screen } from "@testing-library/preact";
-import StartEditingButtonComponent from "../startEditingButton";
+import StartEditingButtonComponent, { getEditButtonPosition } from "../startEditingButton";
 import Config from "../../../configManager/configManager";
 import { asyncRender } from "../../../__test__/utils";
 
@@ -45,4 +45,52 @@ describe("StartEditingButtonComponent", () => {
             "https://app.contentstack.com/#!/stack/bltapikey/visual-builder?branch=main&environment=bltenvironment&target-url=http%3A%2F%2Flocalhost%3A3000%2F&locale=en-us"
         );
     });
+
+    test("should not render when enable is false", async () => {
+        Config.set("editButtonBuilder.enable", false);
+        const { container } = await asyncRender(<StartEditingButtonComponent />);
+        expect(container).toBeEmptyDOMElement();
+    });
+
+    test("should render when enable is true", async () => {
+        Config.set("editButtonBuilder.enable", true);
+        const { getByTestId } = await asyncRender(<StartEditingButtonComponent />);
+        const button = getByTestId("vcms-start-editing-btn");
+        expect(button).toBeInTheDocument();
+    });
+
+    test.each([
+        'bottom-right',
+        'bottom-left',
+        'top-left',
+        'top-right'
+    ])('should return valid position %s', (position) => {
+        expect(getEditButtonPosition(position)).toBe(position);
+    });
+
+    test.each([
+        'invalid-position',
+        'center',
+        '',
+        undefined,
+        null,
+        123,
+        {},
+        [],
+        false,
+    ])('should return bottom-right for invalid input: %s', (invalidPosition) => {
+        expect(getEditButtonPosition(invalidPosition)).toBe('bottom-right');
+    });
+    
+    test("should render with default values when editButtonBuilder config is missing", async () => {
+        Config.reset();
+        Config.set("stackDetails.apiKey", "bltapikey");
+        Config.set("stackDetails.environment", "bltenvironment");
+
+        const { getByTestId } = await asyncRender(<StartEditingButtonComponent />);
+        const button = getByTestId("vcms-start-editing-btn");
+        
+        expect(Config.get().editButtonBuilder.position).toBe("bottom-right")
+        expect(button).toBeInTheDocument();
+    });
 });

src/visualBuilder/components/startEditingButton.tsx

@@ -16,7 +16,7 @@ const positionStyles: Record<Position, string> = {
     "top-right": visualBuilderStyles()['visual-builder__start-editing-btn__top-right'],
 }
 
-function getEditButtonPosition(position: any): Position {
+export function getEditButtonPosition(position: any): Position {
     const validPositions: Position[] = ['bottom-left', 'bottom-right', 'top-left', 'top-right']
     if(validPositions.includes(position)){
         return position