### Question:
AsciiStringListUtil { @Nullable public static Set<String> stringToSet(@Nullable String spaceDelimitedStr) { if (spaceDelimitedStr == null) { return null; } List<String> strings = Arrays.asList(TextUtils.split(spaceDelimitedStr, " ")); LinkedHashSet<String> stringSet = new LinkedHashSet<>(strings.size()); stringSet.addAll(strings); return stringSet; } private  AsciiStringListUtil(); @Nullable static String iterableToString(@Nullable Iterable<String> strings); @Nullable static Set<String> stringToSet(@Nullable String spaceDelimitedStr);  }### Answer:
@Test public void testScopeStringToSet() throws Exception { Set<String> result = AsciiStringListUtil.stringToSet("email profile email openid"); assertNotNull(result); assertEquals(SCOPES.size(), result.size()); assertTrue(result.contains("email")); assertTrue(result.contains("profile")); assertTrue(result.contains("openid")); }