@Test
public void testReverseWholeCharsArray() throws Exception {
char[] inputWords = {'H', 'e', 'l', 'l', 'o', SPACE, 'w', 'o', 'r', 'l', 'd'};
ReverseWordsAlgorithm.reverseCharsArray(inputWords, 0, inputWords.length);
char[] expectedResult = {'d', 'l', 'r', 'o', 'w', SPACE, 'o', 'l', 'l', 'e', 'H'};
assertArrayEquals(expectedResult, inputWords);
}
@Test
public void testReverse2WordsWithManySpacesBetweenWords() throws Exception {
char[] inputWords = {'H', 'e', 'l', 'l', 'o', SPACE, SPACE, SPACE, 'w', 'o', 'r', 'l', 'd'};
char[] actualResult = ReverseWordsAlgorithm.reverseWords(inputWords);
char[] expectedResult = {'w', 'o', 'r', 'l', 'd', SPACE, SPACE, SPACE, 'H', 'e', 'l', 'l', 'o'};
assertArrayEquals(expectedResult, actualResult);
}
@Test
public void testReverse5Words() throws Exception {
char[] inputWords = {
'H', 'e', 'l', 'l', 'o', SPACE, 'm', 'y', SPACE, 'w', 'o', 'n', 'd', 'e', 'r', 'f', 'u', 'l',
SPACE, 's', 'a', 'd', SPACE, 'w', 'o', 'r', 'l', 'd'
};
char[] actualResult = ReverseWordsAlgorithm.reverseWords(inputWords);
char[] expectedResult = {
'w', 'o', 'r', 'l', 'd', SPACE, 's', 'a', 'd', SPACE, 'w', 'o', 'n', 'd', 'e', 'r', 'f', 'u',
'l', SPACE, 'm', 'y', SPACE, 'H', 'e', 'l', 'l', 'o'
};
assertArrayEquals(expectedResult, actualResult);
}
@Test
public void testSkipSpacesInTheBeginning() throws Exception {
char[] inputWords = {SPACE, SPACE, 'A'};
int actualResult = ReverseWordsAlgorithm.skipSpaces(inputWords, 0);
assertEquals(2, actualResult);
}
@Test
public void testSkipSpacesInTheEnd() throws Exception {
char[] inputWords = {'H', SPACE, SPACE};
int actualResult = ReverseWordsAlgorithm.skipSpaces(inputWords, 1);
assertEquals(2, actualResult);
}