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Merged
merged 3 commits into from
Nov 6, 2022
Merged

Add unit tests for SimpleSubCipher #3688

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c43e328
Add unit tests for simple sub cipher
AlexandreVelloso Oct 26, 2022
8a6b415
Merge branch 'master' into simpleSubCipher_test
AlexandreVelloso Oct 27, 2022
c5d4ac8
Merge branch 'master' into simpleSubCipher_test
siriak Nov 6, 2022
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30 changes: 11 additions & 19 deletions src/main/java/com/thealgorithms/ciphers/SimpleSubCipher.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,8 +19,8 @@ public class SimpleSubCipher {
* @param cipherSmall
* @return Encrypted message
*/
public static String encode(String message, String cipherSmall) {
String encoded = "";
public String encode(String message, String cipherSmall) {
StringBuilder encoded = new StringBuilder();

// This map is used to encode
Map<Character, Character> cipherMap = new HashMap<>();
Expand All @@ -39,13 +39,13 @@ public static String encode(String message, String cipherSmall) {

for (int i = 0; i < message.length(); i++) {
if (Character.isAlphabetic(message.charAt(i))) {
encoded += cipherMap.get(message.charAt(i));
encoded.append(cipherMap.get(message.charAt(i)));
} else {
encoded += message.charAt(i);
encoded.append(message.charAt(i));
}
}

return encoded;
return encoded.toString();
}

/**
Expand All @@ -56,10 +56,10 @@ public static String encode(String message, String cipherSmall) {
* @param cipherSmall
* @return message
*/
public static String decode(String encryptedMessage, String cipherSmall) {
String decoded = "";
public String decode(String encryptedMessage, String cipherSmall) {
StringBuilder decoded = new StringBuilder();

Map<Character, Character> cipherMap = new HashMap<Character, Character>();
Map<Character, Character> cipherMap = new HashMap<>();

char beginSmallLetter = 'a';
char beginCapitalLetter = 'A';
Expand All @@ -74,21 +74,13 @@ public static String decode(String encryptedMessage, String cipherSmall) {

for (int i = 0; i < encryptedMessage.length(); i++) {
if (Character.isAlphabetic(encryptedMessage.charAt(i))) {
decoded += cipherMap.get(encryptedMessage.charAt(i));
decoded.append(cipherMap.get(encryptedMessage.charAt(i)));
} else {
decoded += encryptedMessage.charAt(i);
decoded.append(encryptedMessage.charAt(i));
}
}

return decoded;
return decoded.toString();
}

public static void main(String[] args) {
String a = encode(
"defend the east wall of the castle",
"phqgiumeaylnofdxjkrcvstzwb"
);
String b = decode(a, "phqgiumeaylnofdxjkrcvstzwb");
System.out.println(b);
}
}
37 changes: 37 additions & 0 deletions src/test/java/com/thealgorithms/ciphers/SimpleSubCipherTest.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,37 @@
package com.thealgorithms.ciphers;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

class SimpleSubCipherTest {

SimpleSubCipher simpleSubCipher = new SimpleSubCipher();

@Test
void simpleSubCipherEncryptTest() {
// given
String text = "defend the east wall of the castle";
String cipherSmall = "phqgiumeaylnofdxjkrcvstzwb";

// when
String cipherText = simpleSubCipher.encode(text, cipherSmall);

// then
assertEquals("giuifg cei iprc tpnn du cei qprcni", cipherText);
}

@Test
void simpleSubCipherDecryptTest() {
// given
String encryptedText = "giuifg cei iprc tpnn du cei qprcni";
String cipherSmall = "phqgiumeaylnofdxjkrcvstzwb";

// when
String decryptedText = simpleSubCipher.decode(encryptedText, cipherSmall);

// then
assertEquals("defend the east wall of the castle", decryptedText);
}

}