test: isolate multi-root e2e coverage

Author: roomote

apps/vscode-e2e/fixtures/read-file.json

@@ -109,6 +109,21 @@
 					}
 				]
 			}
+		},
+		{
+			"match": {
+				"sequenceIndex": 0,
+				"userMessage": "READ_FILE_MULTI_ROOT_REPRO"
+			},
+			"response": {
+				"toolCalls": [
+					{
+						"name": "read_file",
+						"arguments": "{\"path\":\"secondary-root-read-file.txt\",\"mode\":\"slice\",\"offset\":1,\"limit\":50,\"indentation\":{\"anchor_line\":1,\"max_levels\":0,\"include_siblings\":false,\"include_header\":true,\"max_lines\":50}}",
+						"id": "call_read_file_multi_root_secondary_001"
+					}
+				]
+			}
 		}
 	]
 }

apps/vscode-e2e/src/fixtures/read-file.ts

@@ -71,6 +71,12 @@ export function addReadFileResultFixtures(mock: InstanceType<typeof LLMock>) {
 			result: "The file [`large-read-file.txt`](large-read-file.txt) contains 100 lines, each following the pattern: `Line N: This is a test line with some content`, where `N` is the line number (from 1 to 100). The structure is consistent throughout the file, with only the line number changing on each line.",
 			id: "call_read_file_large_002",
 		},
+		{
+			toolCallId: "call_read_file_multi_root_secondary_001",
+			expected: ["File: secondary-root-read-file.txt", "SECONDARY_ROOT_MARKER_204"],
+			result: "The read_file tool successfully read `secondary-root-read-file.txt` from the secondary workspace root. Its contents include `SECONDARY_ROOT_MARKER_204`.",
+			id: "call_read_file_multi_root_secondary_002",
+		},
 	]
 
 	for (const fixture of fixtures) {

apps/vscode-e2e/src/runTest.ts

@@ -26,11 +26,20 @@ function isDeepSeekTargetedRun(testFile?: string, testGrep?: string) {
 	return testGrep?.toLowerCase().includes("deepseek") ?? false
 }
 
+function isMultiRootTargetedRun(testFile?: string, testGrep?: string) {
+	if (testFile?.toLowerCase().includes("multi-root-read-file-content.test")) {
+		return true
+	}
+
+	return testGrep?.toLowerCase().includes("multi-root") ?? false
+}
+
 async function main() {
 	const isRecord = process.env.AIMOCK_RECORD === "true"
 	const testGrep = getCliFlagValue("--grep") || process.env.TEST_GREP
 	const testFile = getCliFlagValue("--file") || process.env.TEST_FILE
 	const isDeepSeekTest = isDeepSeekTargetedRun(testFile, testGrep)
+	const isMultiRootTest = isMultiRootTargetedRun(testFile, testGrep)
 
 	if (isRecord && isDeepSeekTest && !process.env.DEEPSEEK_API_KEY) {
 		throw new Error("AIMOCK_RECORD=true requires DEEPSEEK_API_KEY to record DeepSeek fixtures")
@@ -58,11 +67,28 @@ async function main() {
 	const extensionTestsPath = path.resolve(__dirname, "./suite/index")
 
 	let testWorkspace: string | undefined
+	let secondaryWorkspace: string | undefined
+	let multiRootWorkspaceFile: string | undefined
 
 	try {
 		// Create a temporary workspace folder for tests before installing fixtures that
 		// need workspace-specific paths.
 		testWorkspace = await fs.mkdtemp(path.join(os.tmpdir(), "roo-test-workspace-"))
+		if (isMultiRootTest) {
+			secondaryWorkspace = await fs.mkdtemp(path.join(os.tmpdir(), "roo-test-secondary-workspace-"))
+			multiRootWorkspaceFile = path.join(os.tmpdir(), `roo-test-workspace-${Date.now()}.code-workspace`)
+			await fs.writeFile(
+				multiRootWorkspaceFile,
+				JSON.stringify(
+					{
+						folders: [{ path: testWorkspace }, { path: secondaryWorkspace }],
+					},
+					null,
+					2,
+				),
+				"utf8",
+			)
+		}
 
 		if (useMock) {
 			const fixturesDir = path.resolve(__dirname, "../fixtures")
@@ -134,14 +160,20 @@ async function main() {
 		await runTests({
 			extensionDevelopmentPath,
 			extensionTestsPath,
-			launchArgs: [testWorkspace],
+			launchArgs: [multiRootWorkspaceFile ?? testWorkspace],
 			extensionTestsEnv,
 			version: process.env.VSCODE_VERSION || "1.101.2",
 		})
 	} catch (error) {
 		console.error("Failed to run tests", error)
 		process.exitCode = 1
 	} finally {
+		if (multiRootWorkspaceFile) {
+			await fs.rm(multiRootWorkspaceFile, { force: true })
+		}
+		if (secondaryWorkspace) {
+			await fs.rm(secondaryWorkspace, { recursive: true, force: true })
+		}
 		if (testWorkspace) {
 			await fs.rm(testWorkspace, { recursive: true, force: true })
 		}

apps/vscode-e2e/src/suite/multi-root-read-file-content.test.ts

@@ -0,0 +1,96 @@
+import * as assert from "assert"
+import * as fs from "fs/promises"
+import * as path from "path"
+import * as vscode from "vscode"
+
+import { RooCodeEventName, type ClineMessage } from "@roo-code/types"
+
+import { setDefaultSuiteTimeout } from "./test-utils"
+import { waitFor } from "./utils"
+
+suite("Multi-root readFileContent repro", function () {
+	setDefaultSuiteTimeout(this)
+
+	test("should read a file that exists only in the secondary workspace root", async () => {
+		await waitFor(() => (vscode.workspace.workspaceFolders?.length ?? 0) >= 2, {
+			timeout: 60_000,
+			interval: 250,
+		})
+
+		const primaryWorkspace = vscode.workspace.workspaceFolders?.[0]
+		assert.ok(primaryWorkspace, "Expected a primary workspace folder")
+		const secondaryWorkspace = vscode.workspace.workspaceFolders?.[1]
+		assert.ok(secondaryWorkspace, "Expected a secondary workspace folder")
+
+		const primaryRoot = primaryWorkspace.uri.fsPath
+		const secondaryRoot = secondaryWorkspace.uri.fsPath
+		const secondaryFileName = "secondary-root-read-file.txt"
+		const expectedContent = "SECONDARY_ROOT_MARKER_204\n"
+		const secondaryFilePath = path.join(secondaryRoot, secondaryFileName)
+
+		await fs.writeFile(secondaryFilePath, expectedContent, "utf8")
+
+		const api = globalThis.api
+		const messages: ClineMessage[] = []
+		const messageHandler = ({ message }: { message: ClineMessage }) => {
+			if (message.partial !== true) {
+				messages.push(message)
+			}
+		}
+		api.on(RooCodeEventName.Message, messageHandler)
+
+		let taskCompleted = false
+		let taskId = ""
+		const taskCompletedHandler = (id: string) => {
+			if (id === taskId) {
+				taskCompleted = true
+			}
+		}
+		api.on(RooCodeEventName.TaskCompleted, taskCompletedHandler)
+
+		try {
+			taskId = await api.startNewTask({
+				configuration: {
+					mode: "code",
+					autoApprovalEnabled: true,
+					alwaysAllowReadOnly: true,
+					alwaysAllowReadOnlyOutsideWorkspace: true,
+				},
+				text:
+					`READ_FILE_MULTI_ROOT_REPRO: Use only the read_file tool to read "${secondaryFileName}". ` +
+					`The file exists in the current VS Code workspace, but only inside the secondary workspace root. ` +
+					`After the read attempt, explain exactly what happened.`,
+			})
+
+			await waitFor(() => taskCompleted, { timeout: 60_000, interval: 250 })
+
+			assert.ok(
+				vscode.workspace.workspaceFolders?.some((folder) => folder.uri.fsPath === secondaryRoot),
+				`Expected secondary root ${secondaryRoot} to remain part of the workspace during the repro`,
+			)
+
+			const completionMessage = messages.find(
+				(message) =>
+					message.type === "say" &&
+					(message.say === "completion_result" || message.say === "text") &&
+					message.text?.includes("SECONDARY_ROOT_MARKER_204"),
+			)
+
+			assert.ok(
+				completionMessage,
+				`Expected the task to read the secondary-root file. Primary root was ${primaryRoot}, secondary root was ${secondaryRoot}, secondary file was ${secondaryFilePath}, and messages were ${JSON.stringify(messages, null, 2)}.`,
+			)
+		} finally {
+			api.off(RooCodeEventName.Message, messageHandler)
+			api.off(RooCodeEventName.TaskCompleted, taskCompletedHandler)
+
+			try {
+				await api.cancelCurrentTask()
+			} catch {
+				// Ignore cleanup races if the task already ended.
+			}
+
+			await fs.rm(secondaryFilePath, { force: true })
+		}
+	})
+})