✨ feat(file_upload): add new file upload feature in main.py and corre…

…sponding tests in spec.cy.ts

This commit introduces a new feature that allows users to upload files. The main.py file contains the implementation of the file upload feature, while the spec.cy.ts file contains the tests for this feature.

cypress/e2e/file_upload/main.py

@@ -0,0 +1,14 @@
+import chainlit as cl
+
+
+@cl.on_file_upload(accept={"text/plain": [".py"]})
+async def upload_file(files: any):
+    for file_data in files:
+        await cl.Message(
+            content=f"`{file_data['name']}` uploaded, it contains {len(file_data['content'])} characters!"
+        ).send()
+
+
+@cl.on_chat_start
+async def start():
+    await cl.Message(content=f"Try to upload a file").send()

cypress/e2e/file_upload/spec.cy.ts

@@ -0,0 +1,31 @@
+import { runTestServer } from "../../support/testUtils";
+
+describe("Upload file", () => {
+  before(() => {
+    runTestServer();
+  });
+
+  it("should be able to upload and decode files", () => {
+    cy.get("#upload-button").should("exist");
+
+    // Upload a text file
+    cy.fixture("state_of_the_union.txt", "utf-8").as("txtFile");
+    cy.get("input[type=file]").selectFile("@txtFile", { force: true });
+
+    cy.get(".message")
+      .eq(1)
+      .should("contain", "state_of_the_union.txt uploaded, it contains");
+
+    // Expecting a python file, cpp file upload should be rejected
+    cy.fixture("hello.cpp", "utf-8").as("cppFile");
+    cy.get("input[type=file]").selectFile("@cppFile", { force: true });
+
+    // Upload a python file
+    cy.fixture("hello.py", "utf-8").as("pyFile");
+    cy.get("input[type=file]").selectFile("@pyFile", { force: true });
+
+    cy.get(".message")
+      .eq(2)
+      .should("contain", "hello.py uploaded, it contains");
+  });
+});