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 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 };
}

	public static createPatterns(workspaceFolder: URI): RegExp[] {
		const patterns: RegExp[] = [];

		const workspaceFolderPath = workspaceFolder.scheme === Schemas.file ? workspaceFolder.fsPath : workspaceFolder.path;
		const workspaceFolderVariants = [workspaceFolderPath];
		if (isWindows && workspaceFolder.scheme === Schemas.file) {
			workspaceFolderVariants.push(extpath.toSlashes(workspaceFolderPath));
		}

		workspaceFolderVariants.forEach(workspaceFolderVariant => {
			const validPathCharacterPattern = '[^\\s\\(\\):<>"]';
			const validPathCharacterOrSpacePattern = `(?:${validPathCharacterPattern}| ${validPathCharacterPattern})`;
			const pathPattern = `${validPathCharacterOrSpacePattern}+\\.${validPathCharacterPattern}+`;
			const strictPathPattern = `${validPathCharacterPattern}+`;

			// Example: /workspaces/express/server.js on line 8, column 13
			patterns.push(new RegExp(strings.escapeRegExpCharacters(workspaceFolderVariant) + `(${pathPattern}) on line ((\\d+)(, column (\\d+))?)`, 'gi'));

			// Example: /workspaces/express/server.js:line 8, column 13
			patterns.push(new RegExp(strings.escapeRegExpCharacters(workspaceFolderVariant) + `(${pathPattern}):line ((\\d+)(, column (\\d+))?)`, 'gi'));

			// Example: /workspaces/mankala/Features.ts(45): error
			// Example: /workspaces/mankala/Features.ts (45): error
			// Example: /workspaces/mankala/Features.ts(45,18): error
			// Example: /workspaces/mankala/Features.ts (45,18): error
			// Example: /workspaces/mankala/Features Special.ts (45,18): error
			patterns.push(new RegExp(strings.escapeRegExpCharacters(workspaceFolderVariant) + `(${pathPattern})(\\s?\\((\\d+)(,(\\d+))?)\\)`, 'gi'));

			// Example: at /workspaces/mankala/Game.ts
			// Example: at /workspaces/mankala/Game.ts:336
			// Example: at /workspaces/mankala/Game.ts:336:9
			patterns.push(new RegExp(strings.escapeRegExpCharacters(workspaceFolderVariant) + `(${strictPathPattern})(:(\\d+))?(:(\\d+))?`, 'gi'));
		});

		return patterns;
	}

	test('toForwardSlashes', () => {
		assert.equal(extpath.toSlashes('\\\\server\\share\\some\\path'), '//server/share/some/path');
		assert.equal(extpath.toSlashes('c:\\test'), 'c:/test');
		assert.equal(extpath.toSlashes('foo\\bar'), 'foo/bar');
		assert.equal(extpath.toSlashes('/user/far'), '/user/far');
	});