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62 lines (52 loc) · 2.21 KB
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package util;
import org.junit.Before;
import org.junit.Test;
import java.util.Map;
import static org.assertj.core.api.Assertions.assertThat;
public class StringUtilTest {
@Test
public void givenStringNotNull_whenCountDuplicateCharactersForeach_thenOK() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersForeach("HelloWorld!");
assertCountOK(result);
}
@Test
public void givenStringNotNull_whenCountDuplicateCharactersStream_thenOK() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersStream("HelloWorld!");
assertCountOK(result);
}
private void assertCountOK(Map<Character, Long> result) {
assertThat(result).isNotNull();
assertThat(result).isNotEmpty();
assertThat(result.get('H')).isEqualTo(1);
assertThat(result.get('e')).isEqualTo(1);
assertThat(result.get('l')).isEqualTo(3);
assertThat(result.get('o')).isEqualTo(2);
assertThat(result.get('W')).isEqualTo(1);
assertThat(result.get('r')).isEqualTo(1);
assertThat(result.get('d')).isEqualTo(1);
assertThat(result.get('!')).isEqualTo(1);
assertThat(result.get('a')).isNull(); // returning a null if the key is absent
}
@Test
public void givenStringNull_whenCountDupCharForeach_thenResultIsNull() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersForeach(null);
assertThat(result).isNull();
}
@Test
public void givenEmptyStringNull_whenCountDupCharForEach_thenResultIsEmpty() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersForeach("");
assertThat(result).isNotNull();
assertThat(result).isEmpty();
}
@Test
public void givenStringNull_whenCountDupCharStream_thenResultIsNull() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersStream(null);
assertThat(result).isNull();
}
@Test
public void givenEmptyStringNull_whenCountDupCharStream_thenResultIsEmpty() {
Map<Character, Long> result = new StringUtil().countDuplicateCharactersStream("");
assertThat(result).isNotNull();
assertThat(result).isEmpty();
}
}