function assertResolve(u1: URI, path: string, expected: URI) {
		const actual = resolvePath(u1, path);
		assertEqualURI(actual, expected, `from ${u1.toString()} and ${path}`);

		if (!isAbsolute(path)) {
			let expectedPath = isWindows ? toSlashes(path) : path;
			expectedPath = startsWith(expectedPath, './') ? expectedPath.substr(2) : expectedPath;
			assert.equal(relativePath(u1, actual), expectedPath, `relativePath (${u1.toString()}) on actual (${actual.toString()}) should be to path (${expectedPath})`);
		}
	}

export function getPathLabel(resource: URI | string, userHomeProvider?: IUserHomeProvider, rootProvider?: IWorkspaceFolderProvider): string {
	if (typeof resource === 'string') {
		resource = URI.file(resource);
	}

	// return early if we can resolve a relative path label from the root
	if (rootProvider) {
		const baseResource = rootProvider.getWorkspaceFolder(resource);
		if (baseResource) {
			const hasMultipleRoots = rootProvider.getWorkspace().folders.length > 1;

			let pathLabel: string;
			if (isEqual(baseResource.uri, resource)) {
				pathLabel = ''; // no label if paths are identical
			} else {
				pathLabel = relativePath(baseResource.uri, resource)!;
			}

			if (hasMultipleRoots) {
				const rootName = (baseResource && baseResource.name) ? baseResource.name : basename(baseResource.uri);
				pathLabel = pathLabel ? (rootName + ' • ' + pathLabel) : rootName; // always show root basename if there are multiple
			}

			return pathLabel;
		}
	}

	// return if the resource is neither file:// nor untitled:// and no baseResource was provided
	if (resource.scheme !== Schemas.file && resource.scheme !== Schemas.untitled) {
		return resource.with({ query: null, fragment: null }).toString(true);
	}

	// convert c:\something => C:\something
	if (hasDriveLetter(resource.fsPath)) {
		return normalize(normalizeDriveLetter(resource.fsPath));
	}

	// normalize and tildify (macOS, Linux only)
	let res = normalize(resource.fsPath);
	if (!isWindows && userHomeProvider) {
		res = tildify(res, userHomeProvider.userHome);
	}

	return res;
}

export function getStoredWorkspaceFolder(folderURI: URI, folderName: string | undefined, targetConfigFolderURI: URI, useSlashForPath = !isWindows): IStoredWorkspaceFolder {

	if (folderURI.scheme !== targetConfigFolderURI.scheme) {
		return { name: folderName, uri: folderURI.toString(true) };
	}

	let folderPath: string | undefined;
	if (isEqualOrParent(folderURI, targetConfigFolderURI)) {
		// use relative path
		folderPath = relativePath(targetConfigFolderURI, folderURI) || '.'; // always uses forward slashes
		if (isWindows && folderURI.scheme === Schemas.file && !useSlashForPath) {
			// Windows gets special treatment:
			// - use backslahes unless slash is used by other existing folders
			folderPath = folderPath.replace(/\//g, '\\');
		}
	} else {
		// use absolute path
		if (folderURI.scheme === Schemas.file) {
			folderPath = folderURI.fsPath;
			if (isWindows) {
				// Windows gets special treatment:
				// - normalize all paths to get nice casing of drive letters
				// - use backslahes unless slash is used by other existing folders
				folderPath = normalizeDriveLetter(folderPath);
				if (useSlashForPath) {
					folderPath = toSlashes(folderPath);
				}
			}
		} else {
			if (!isEqualAuthority(folderURI.authority, targetConfigFolderURI.authority)) {
				return { name: folderName, uri: folderURI.toString(true) };
			}
			folderPath = folderURI.path;
		}
	}
	return { name: folderName, path: folderPath };
}

	function assertRelativePath(u1: URI, u2: URI, expectedPath: string | undefined, ignoreJoin?: boolean) {
		assert.equal(relativePath(u1, u2), expectedPath, `from ${u1.toString()} to ${u2.toString()}`);
		if (expectedPath !== undefined && !ignoreJoin) {
			assertEqualURI(removeTrailingPathSeparator(joinPath(u1, expectedPath)), removeTrailingPathSeparator(u2), 'joinPath on relativePath should be equal');
		}
	}