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Add test case for LetterCombinationsOfPhoneNumber (#3662)

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This commit is contained in:
Taranjeet Singh Kalsi
2022-10-26 14:08:24 +05:30
committed by GitHub
parent c9e1d96147
commit eecec0f706
2 changed files with 49 additions and 8 deletions
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11
src/main/java/com/thealgorithms/strings/List_all_Possible_Words_From_Phone_Digits.java → src/main/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumber.java
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@ -2,16 +2,11 @@ package com.thealgorithms.strings;
import java.util.*;
public class List_all_Possible_Words_From_Phone_Digits {
public class LetterCombinationsOfPhoneNumber {
static Character[][] numberToCharMap;
private static List<String> printWords(
int[] numbers,
int len,
int numIndex,
String s
) {
protected static List<String> printWords(int[] numbers, int len, int numIndex, String s) {
if (len == numIndex) {
return new ArrayList<>(Collections.singleton(s));
}
@ -33,7 +28,7 @@ public class List_all_Possible_Words_From_Phone_Digits {
stringList.stream().forEach(System.out::println);
}
private static void generateNumberToCharMap() {
protected static void generateNumberToCharMap() {
numberToCharMap = new Character[10][5];
numberToCharMap[0] = new Character[] { '\0' };
numberToCharMap[1] = new Character[] { '\0' };

46
src/test/java/com/thealgorithms/strings/LetterCombinationsOfPhoneNumberTest.java Normal file
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@ -0,0 +1,46 @@
package com.thealgorithms.strings;
import java.util.*;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
public class LetterCombinationsOfPhoneNumberTest {
@Test
public void letterCombinationsOfPhoneNumber() {
LetterCombinationsOfPhoneNumber ob = new LetterCombinationsOfPhoneNumber();
ob.generateNumberToCharMap();
// ** Test 1 **
// Input: digits = ""
// Output: []
int[] numbers1 = {};
List<String> output1 = Arrays.asList("");
assertTrue(ob.printWords(numbers1, numbers1.length, 0, "").equals(output1));
// ** Test 2 **
// Input: digits = "2"
// Output: ["a","b","c"]
int[] numbers2 = { 2 };
List<String> output2 = Arrays.asList("a", "b", "c");
assertTrue(ob.printWords(numbers2, numbers2.length, 0, "").equals(output2));
// ** Test 3 **
// Input: digits = "23"
// Output: ["ad","ae","af","bd","be","bf","cd","ce","cf"]
int[] numbers3 = { 2, 3 };
List<String> output3 = Arrays.asList("ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf");
assertTrue(ob.printWords(numbers3, numbers3.length, 0, "").equals(output3));
// ** Test 4 **
// Input: digits = "234"
// Output: ["adg", "adh", "adi", "aeg", "aeh", "aei", "afg", "afh", "afi",
// "bdg", "bdh", "bdi", "beg", "beh", "bei", "bfg", "bfh", "bfi", "cdg", "cdh",
// "cdi", "ceg", "ceh", "cei", "cfg", "cfh", "cfi"]
int[] numbers4 = { 2, 3, 4 };
List<String> output4 = Arrays.asList("adg", "adh", "adi", "aeg", "aeh", "aei", "afg", "afh", "afi", "bdg",
"bdh", "bdi", "beg", "beh", "bei", "bfg", "bfh", "bfi", "cdg", "cdh", "cdi", "ceg", "ceh", "cei", "cfg",
"cfh", "cfi");
assertTrue(ob.printWords(numbers4, numbers4.length, 0, "").equals(output4));
}
}