public class Foo {
    public void a() {
        StringBuilder sb = new StringBuilder();
        int start = sb.indexOf(" ");
        if (start == -1) {
            sb.append("Bar");
            sb.append(" "); // warning expected: Avoid appending characters as strings in StringBuffer.append. 
        }
    }
    public void b() {
        StringBuffer sb = new StringBuffer(); // warning expected: StringBuffer constructor is initialized with size 16, but has at least 17 characters appended. 
        sb.append("test "); // warning expected: StringBuffer (or StringBuilder).append is called 3 consecutive times with literals. Use a single append with a single combined String. 
        sb.append("test2 ").append("test3 ");
    }
}