### Question:
SchemaUtils { public static String replaceBlank(String str) { String dest = ""; if (str != null) { Matcher m = p.matcher(str); dest = m.replaceAll(""); } return dest; } private  SchemaUtils(); @SuppressWarnings("unchecked") static List<String> getAllSchemaList(); static boolean isAGreatVersion(String schemaVersion, String version); static String getSoftVersion(); static String replaceBlank(String str);  }### Answer:
@Test public void testReplaceBlank() { Assert.assertEquals("abc", SchemaUtils.replaceBlank(" abc")); Assert.assertEquals("abc", SchemaUtils.replaceBlank("abc ")); Assert.assertEquals("abc", SchemaUtils.replaceBlank("a b c")); Assert.assertEquals("abc", SchemaUtils.replaceBlank("a b c")); Assert.assertEquals("", SchemaUtils.replaceBlank(" ")); Assert.assertEquals("", SchemaUtils.replaceBlank(null)); Assert.assertEquals("我怕的你", SchemaUtils.replaceBlank("我怕的 你")); }