chore: add storybook stories for combobox component (#16451)

site/src/components/Combobox/Combobox.stories.tsx

@@ -0,0 +1,132 @@
+import type { Meta, StoryObj } from "@storybook/react";
+import { expect, screen, userEvent, waitFor, within } from "@storybook/test";
+import { useState } from "react";
+import { Combobox } from "./Combobox";
+
+const options = ["Option 1", "Option 2", "Option 3", "Another Option"];
+
+const ComboboxWithHooks = () => {
+	const [value, setValue] = useState("");
+	const [open, setOpen] = useState(false);
+	const [inputValue, setInputValue] = useState("");
+
+	return (
+		<Combobox
+			value={value}
+			options={options}
+			placeholder="Select option"
+			open={open}
+			onOpenChange={setOpen}
+			inputValue={inputValue}
+			onInputChange={setInputValue}
+			onSelect={setValue}
+			onKeyDown={(e) => {
+				if (e.key === "Enter" && inputValue && !options.includes(inputValue)) {
+					setValue(inputValue);
+					setInputValue("");
+					setOpen(false);
+				}
+			}}
+		/>
+	);
+};
+
+const meta: Meta<typeof Combobox> = {
+	title: "components/Combobox",
+	component: Combobox,
+};
+
+export default meta;
+type Story = StoryObj<typeof Combobox>;
+
+export const Default: Story = {
+	render: () => <ComboboxWithHooks />,
+};
+
+export const OpenCombobox: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		await userEvent.click(canvas.getByRole("button"));
+
+		await waitFor(() => expect(screen.getByRole("dialog")).toBeInTheDocument());
+	},
+};
+
+export const SelectOption: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		await userEvent.click(canvas.getByRole("button"));
+		await userEvent.click(screen.getByText("Option 1"));
+
+		await waitFor(() =>
+			expect(canvas.getByRole("button")).toHaveTextContent("Option 1"),
+		);
+	},
+};
+
+export const SearchAndFilter: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		await userEvent.click(canvas.getByRole("button"));
+		await userEvent.type(screen.getByRole("combobox"), "Another");
+		await userEvent.click(
+			screen.getByRole("option", { name: "Another Option" }),
+		);
+
+		await waitFor(() => {
+			expect(
+				screen.getByRole("option", { name: "Another Option" }),
+			).toBeInTheDocument();
+			expect(
+				screen.queryByRole("option", { name: "Option 1" }),
+			).not.toBeInTheDocument();
+		});
+	},
+};
+
+export const EnterCustomValue: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		await userEvent.click(canvas.getByRole("button"));
+		await userEvent.type(screen.getByRole("combobox"), "Custom Value{enter}");
+
+		await waitFor(() =>
+			expect(canvas.getByRole("button")).toHaveTextContent("Custom Value"),
+		);
+	},
+};
+
+export const NoResults: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+		await userEvent.click(canvas.getByRole("button"));
+		await userEvent.type(screen.getByRole("combobox"), "xyz");
+
+		await waitFor(() => {
+			expect(screen.getByText("No results found")).toBeInTheDocument();
+			expect(screen.getByText("Enter custom value")).toBeInTheDocument();
+		});
+	},
+};
+
+export const ClearSelectedOption: Story = {
+	render: () => <ComboboxWithHooks />,
+	play: async ({ canvasElement }) => {
+		const canvas = within(canvasElement);
+
+		await userEvent.click(canvas.getByRole("button"));
+		// First select an option
+		await userEvent.click(screen.getByRole("option", { name: "Option 1" }));
+		// Then clear it by selecting it again
+		await userEvent.click(screen.getByRole("option", { name: "Option 1" }));
+
+		await waitFor(() =>
+			expect(canvas.getByRole("button")).toHaveTextContent("Select option"),
+		);
+	},
+};