Palindrome discoverer

// Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);

// Get user input 
System.out.print("Enter a word or phrase: ");
String userInput = keyboard.nextLine();

/**
 * Method should return true if a string is identified as a palindrome.
 * There are many ways to do a palindrome check, this is just one of them.
 * If you are performing checks on very, very long strings you may want to
 * consider another algorithm.
 *
 * @param str
 * @return
 */
public static boolean isPalindrome(String str) {

    if (str.length() <= 1) {
        return true;
    } else {
        String toCompare = str.replaceAll("\s+","");

        StringBuffer buffer = new StringBuffer(toCompare);
        String reversedString = buffer.reverse().toString();

        if (reversedString.equalsIgnoreCase(toCompare)) {
            return true;
        } else {
            return false;
        }
    }
}

boolean isAPalindrome = isPalindrome(userInput);

if (isAPalindrome) {
    System.out.print("The word or phrase is a palindrome");
} else {
    System.out.print("Sorry the word or phrase is NOT a palindrome");
}

Enter a word or phrase: Able was I ere I saw Elba
The word or phrase is a palindrome

@Test
public void is_a_palindrome_single_char () {
    assertTrue(PalindromeDiscoverer.isPalindrome("A"));
}

@Test
public void is_a_palindrome () {
    assertTrue(PalindromeDiscoverer.isPalindrome("bob"));
}

@Test
public void is_a_palindrome_mixed_case () {
    assertTrue(PalindromeDiscoverer.isPalindrome("A but tuba"));
}

@Test
public void is_a_palindrome_longer_phrase () {
    assertTrue(PalindromeDiscoverer.isPalindrome("Able was I ere I saw Elba"));
}

@Test
public void is_not_a_palindrome () {
    assertFalse(PalindromeDiscoverer.isPalindrome("Free beer, I am there..."));
}