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Testing Custom PDF Component Integration in Gradio

This test suite validates the functionality of a custom PDF component in Gradio, focusing on file upload, display, and download capabilities. The tests ensure proper handling of PDF documents and verify the component’s integration with the application interface.

Test Coverage Overview

The test suite provides coverage for core PDF component operations including:

File upload functionality through drag-and-drop interface
PDF document rendering and display verification
Download functionality and filename preservation
Canvas element visibility for PDF rendering

Implementation Analysis

The testing approach utilizes Playwright’s page object model for UI interaction simulation. The implementation leverages async/await patterns for handling file operations and employs event listeners for download tracking. The tests demonstrate proper component isolation and state management.

Technical Details

Testing Framework: Playwright with TypeScript
Key Libraries: @self/tootils for test utilities
Test Artifacts: Sample PDF file (contract.pdf)
Component Selectors: Role-based and type-based locators

Best Practices Demonstrated

The test suite exemplifies several testing best practices including proper use of async/await for asynchronous operations, explicit element waiting strategies, and clear test case isolation. The code demonstrates effective use of Playwright’s testing utilities and maintains clear separation of concerns.

gradio-app/gradio

js/spa/test/gradio_pdf_demo.spec.ts

            
import { test, expect } from "@self/tootils";

test.skip("Custom PDF component demo can be loaded and inference function works .", async ({
	page
}) => {
	await page
		.getByRole("button", { name: "Drop PDF - or - Click to Upload" })
		.first()
		.click();
	const uploader = await page.locator("input[type=file]").first();
	await uploader.setInputFiles(["./test/files/contract.pdf"]);

	await page.getByRole("button", { name: "Submit" }).click();

	await expect(page.getByLabel("contract.pdf")).toBeVisible();

	const downloadPromise = page.waitForEvent("download");
	await page.getByRole("link").nth(0).click();
	const download = await downloadPromise;
	await expect(download.suggestedFilename()).toBe("contract.pdf");
});

test.skip("Custom PDF component examples load properly .", async ({ page }) => {
	expect(page.locator("canvas")).toBeVisible();
});