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test(mcp-server): e2e of the shell's sync with the server

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The shell connects, shows what create_new_diagram draws, marks an
edit_diagram change and takes it back with one Ctrl+Z (which get_diagram
then reflects), pushes a shape inserted in the editor, serves
screenshot_diagram, and shows another page only for its SVG export before
the user's page comes back.
This commit is contained in:
dayuan.jiang
2026-10-11 20:56:07 +09:00
parent 21807417c5
commit 5ed8940b48
1 changed files with 162 additions and 4 deletions
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packages/mcp-server/tests/e2e/shell.spec.ts
+162 -4
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@@ -3,13 +3,13 @@
* the built server (dist/index.js) runs over stdio as an MCP client would
* start it, and headless Chromium opens the URL it returns.
*/
import { mkdtempSync, rmSync } from "node:fs"
import { mkdtempSync, readFileSync, rmSync } from "node:fs"
import { tmpdir } from "node:os"
import { dirname, join } from "node:path"
import { fileURLToPath } from "node:url"
import { Client } from "@modelcontextprotocol/sdk/client/index.js"
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js"
import { expect, test } from "@playwright/test"
import { expect, type Page, test } from "@playwright/test"
const pkg = join(dirname(fileURLToPath(import.meta.url)), "../..")
@@ -74,9 +74,9 @@ test("start_session opens the shell, which loads the bundled draw.io", async ({
const frame = page.frameLocator("iframe[title='draw.io']")
await expect(frame.locator(".geDiagramContainer")).toBeVisible()
// The shell's own texts and state
// The shell's own texts and state: the first poll connects it
await expect(page.getByTestId("shell-status")).toHaveText(
"Waiting for the MCP server…",
"Connected to the MCP server",
)
await expect(page.getByTestId("shell-session")).toHaveText(
shellUrl.slice(-8),
@@ -84,6 +84,164 @@ test("start_session opens the shell, which loads the bundled draw.io", async ({
expect(errors).toEqual([])
})
// --- The sync with the server (shell/use-mcp-sync.ts) ---
// Each test draws labels of its own: the previous test's diagram is on the
// canvas when a test starts, and a label shared with it would be visible
// before the test's own write arrives
const box = (id: string, label: string, x: number) =>
`<mxCell id="${id}" value="${label}" x="${x}" y="40" w="120" h="60"/>`
const toolText = async (name: string, args: Record<string, unknown> = {}) => {
const result = await client.callTool({ name, arguments: args })
return (result.content as { type: string; text?: string }[])
.map((c) => c.text ?? "")
.join("\n")
}
/** The shell with the bundled draw.io ready and in step with the server */
async function openShell(page: Page) {
await page.goto(shellUrl)
await expect(page.getByTestId("canvas-loading")).toHaveCount(0, {
timeout: 60_000,
})
await expect(page.getByTestId("shell-status")).toHaveAttribute(
"data-status",
"connected",
)
return page.frameLocator("iframe[title='draw.io']")
}
test("a diagram the MCP draws appears in the shell", async ({ page }) => {
const frame = await openShell(page)
await toolText("create_new_diagram", {
xml: `${box("2", "Alpha", 40)}\n${box("3", "Beta", 240)}\n<mxCell id="4" source="2" target="3"/>`,
})
await expect(frame.getByText("Alpha")).toBeVisible({ timeout: 10_000 })
await expect(frame.getByText("Beta")).toBeVisible()
})
test("an edit is marked on the canvas, and one Ctrl+Z takes it back for the server too", async ({
page,
}) => {
const frame = await openShell(page)
await toolText("create_new_diagram", {
xml: `${box("2", "Node A", 40)}\n${box("3", "Node B", 240)}`,
})
await expect(frame.getByText("Node A")).toBeVisible({ timeout: 10_000 })
await toolText("edit_diagram", {
operations: [
{ operation: "add", cell_id: "5", new_xml: box("5", "Gamma", 440) },
],
})
await expect(frame.getByText("Gamma")).toBeVisible({ timeout: 10_000 })
// The editor bridge outlines the changed shape (editor-bridge.ts
// HIGHLIGHT_OUTLINE); the write went on the canvas in place
await expect(frame.locator('[stroke="#a86b00"]')).toHaveCount(1)
await frame
.locator(".geDiagramContainer")
.click({ position: { x: 10, y: 10 } })
await page.keyboard.press("Control+z")
await expect(frame.getByText("Gamma")).toHaveCount(0)
await expect(frame.getByText("Node A")).toBeVisible()
// The undo is pushed: the server's diagram has no Gamma (get_diagram
// also names the removed cell in its notes, so look at the XML)
await expect
.poll(async () => (await toolText("get_diagram")).includes('id="5"'), {
timeout: 10_000,
})
.toBe(false)
expect(await toolText("get_diagram")).toContain('value="Node A"')
})
test("a change made in the editor is pushed, and get_diagram returns it", async ({
page,
}) => {
const frame = await openShell(page)
await toolText("create_new_diagram", { xml: box("2", "Solo", 40) })
await expect(frame.getByText("Solo")).toBeVisible({ timeout: 10_000 })
// draw.io keeps no global editor; in embed mode Draw.loadPlugin hands
// it to the callback at once
await frame.locator("body").evaluate((body) => {
const w = body.ownerDocument.defaultView as any
w.Draw.loadPlugin((ui: any) => {
const graph = ui.editor.graph
graph.getModel().beginUpdate()
try {
graph.insertVertex(
graph.getDefaultParent(),
"manual-1",
"Manual",
40,
200,
120,
60,
"rounded=1;",
)
} finally {
graph.getModel().endUpdate()
}
})
})
await expect(frame.getByText("Manual")).toBeVisible()
await expect
.poll(
async () =>
(await toolText("get_diagram")).includes('id="manual-1"'),
{ timeout: 10_000 },
)
.toBe(true)
})
test("screenshot_diagram renders the canvas of the shell", async ({ page }) => {
const frame = await openShell(page)
await toolText("create_new_diagram", {
xml: `${box("2", "Shot A", 40)}\n${box("3", "Shot B", 240)}`,
})
await expect(frame.getByText("Shot B")).toBeVisible({ timeout: 10_000 })
const result = await client.callTool({
name: "screenshot_diagram",
arguments: {},
})
const image = (
result.content as { type: string; data?: string; mimeType?: string }[]
).find((c) => c.type === "image")
expect(result.isError ?? false).toBe(false)
expect(image?.mimeType).toBe("image/png")
expect(image?.data?.length ?? 0).toBeGreaterThan(1000)
})
test("exporting another page shows it for a moment, then the user's page comes back", async ({
page,
}) => {
const frame = await openShell(page)
await toolText("create_new_diagram", { xml: box("2", "First page", 40) })
await expect(frame.getByText("First page")).toBeVisible({ timeout: 10_000 })
await toolText("add_page", {
name: "Second",
xml: `<mxGraphModel><root><mxCell id="0"/><mxCell id="1" parent="0"/><mxCell id="s1" value="OnSecond" style="rounded=1;" vertex="1" parent="1"><mxGeometry x="40" y="40" width="120" height="60" as="geometry"/></mxCell></root></mxGraphModel>`,
})
await expect(frame.getByText("Second")).toBeVisible({ timeout: 10_000 })
// SVG has no page option in draw.io: the server sends a one-page
// projection, which the shell shows only for the export
const file = join(dataDir, "second.svg")
const text = await toolText("export_diagram", {
path: file,
page_name: "Second",
})
expect(text).toContain("exported successfully")
expect(readFileSync(file, "utf8")).toContain("OnSecond")
await expect(frame.getByText("First page")).toBeVisible({ timeout: 10_000 })
await expect(frame.locator(".geTabContainer .geActivePage")).toHaveText(
"Page-1",
)
// The projection was never pushed as the document
const xml = await toolText("get_diagram")
expect(xml).toContain('value="First page"')
expect(xml).toContain('name="Second"')
})
test("the theme toggle switches the page and draw.io, and is remembered", async ({
page,
}) => {